1. Stainless steel surface accumulating the attachments contain other metal elements or heterogeneous metal dust particles,
In humid air, condensate and magnets stainless steel fixtures between the two together into a micro-cell, triggering
The electrochemical reaction, the protective film is damaged, call it that electrochemical corrosion.
2. Stainless steel surface adhesion of organic juice (such as vegetables, soup, sputum, etc.), there are circumstances under water, oxygen,
Constitutes organic acids, organic acids prolonged the corrosion on the metal surface.
Alkaline 3. 410 stainless steel plate surface adhesion containing acid, alkali, salts (such as a wall decoration, lime spray
Splash), causing localized corrosion.
4. air pollution (such as with a lot of sulfides, carbon monoxide, nitrogen oxide atmosphere), cold
Condensate water to form sulfuric acid, nitric acid, acetic acid solution point, causing chemical corrosion.
Above may damage the stainless steel surface protection film caused corrosion.
12
2014年12月30日星期二
2014年12月26日星期五
The method of cutting a stainless steel plate
Plus oxygen gas flame can not cut stainless steel because stainless steel is less susceptible to oxidation.
5CM thick stainless steel plate to use a special tool for cutting machining, for example:
(1) the larger wattage Laser Cutting machine (laser cutting machine)
(2) Hydraulic Saw
(3) grinding disc
(4) The person handsaw
(5) Wire Cutting machine (EDM).
(6) high-pressure water jet cutting (professional Waterjet Cutting: Shanghai Symphony No)
(7) Plasma arc cutting
5CM thick stainless steel plate to use a special tool for cutting machining, for example:
(1) the larger wattage Laser Cutting machine (laser cutting machine)
(2) Hydraulic Saw
(3) grinding disc
(4) The person handsaw
(5) Wire Cutting machine (EDM).
(6) high-pressure water jet cutting (professional Waterjet Cutting: Shanghai Symphony No)
(7) Plasma arc cutting
2014年12月23日星期二
Performance stainless steel plate
In addition to the overall heat transfer coefficient of thermal conductivity of metals depends on the metal, but also depends on other factors. In most cases, the film heat transfer coefficient or rust and surface condition of the metal. Stainless steel can keep the surface clean, so it is better than the thermal conductivity of the higher thermal conductivity of other metals. Liaocheng Suntory provide eight stainless steel, stainless steel plate excellent technical standard stainless steel plate corrosion resistance, bending workability and toughness of welded portion, and punching workability of weld high-strength 409 stainless steel plate and its manufacturing method. Specifically is to contain C: 0.02% or less, N: 0.02% or less, Cr: more than 11% but less than 17%, an appropriate content of Si, Mn, P, S, Al, Ni, and satisfies 12≤Cr Mo 1.5Si≤ 17,1≤Ni 30 (CN) 0.5 (Mn Cu) ≤4, Cr 0.5 (Ni Cu) 3.3Mo≥16.0,0.006≤CN≤0.030 stainless steel plate heated to 850 ~ 1250 ℃, then subjected to 1 ℃ / s the cooling rate of the above heat treatment. Such organizations can become more than 12% volume fraction of martensite, 730MPa above high strength, corrosion resistance and bending properties, HAZ toughness of high-strength stainless steel plate 304. Reuse containing Mo, B, etc., can significantly improve the punching workability weld.
2014年12月18日星期四
Stainless steel classification
Stainless steel plate is generally collectively steel plates and acid. Many kinds of stainless steel plate, different performance, it gradually formed several categories in the development process. By organizational structure is divided into martensitic stainless steel (including precipitation hardening stainless steel plate), ferritic stainless steel, austenitic stainless steel and austenitic ferritic plus duplex stainless steel and other four categories, according to the steel major chemical composition of some of the features or steel elements to be classified into chromium stainless steel, chrome-nickel stainless steel, chrome-nickel stainless steel and carbon molybdenum stainless steel, high molybdenum stainless steel plate, stainless steel and other high purity. By steel performance characteristics and uses classified into nitric acid-resistant stainless steel plate, stainless steel plates sulfate resistance, resistance to pitting corrosion of stainless steel plate suppliers, stainless steel plate resistance to stress corrosion, high strength stainless steel panels. By Features steel classified into low temperature stainless steel, non-magnetic stainless steel, free cutting steel plates, stainless steel and other superplasticity. Now commonly used classification method is based on the characteristics of the chemical composition of the steel plate and steel structure characteristics and the method of combining the two categories. Generally divided into martensitic stainless steel sheet, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation-hardened stainless steel plate or stainless steel plate and into chromium nickel stainless steel plate into two categories. Typical uses very versatile: pulp and paper equipment heat exchangers, machinery and equipment, dyeing equipment, film processing equipment, pipelines, coastal areas outside the building with other materials.
2014年12月15日星期一
Stainless steel plate
Stainless steel surface finish, a higher corrosion ductility, toughness and mechanical strength, acid and alkaline gases, solvents and other media. It is a rusty steel is not easy, but not definitely not rust. Stainless steel plate refers to resistance to atmospheric, steam and water and other weak corrosive medium plate, steel and acid refers to acid, alkali, salt and other chemical etching medium corrosion of steel. Stainless steel since the beginning of this century came, and now has 90 years of history. Stainless steel plate refers to resistance to atmospheric, steam and water and other weak corrosive medium plate, steel and acid refers to acid, alkali, salt and other chemical etching medium corrosion of steel. Stainless steel since the beginning of this century, the advent of the development of the 410 stainless steel plate for the development and technological progress of modern industry has laid an important material and technological foundation.
2014年12月10日星期三
Ultra-low carbon ferritic stainless steel cold-rolled plate process
Factors affecting cold-rolled sheet with a body-centered cubic crystal structure of texture formation are:
(1) chemical composition. Increasing the chromium content ferritic stainless steel can be formed in favor of forming properties of texture components in the plate rolling process, the stabilizing elements Nh will strengthen austenite deformation texture, which led to a transformation texture y strengthening;
(2) solid solution elements and two-phase particles. Solute C atom of rotation ferrite grains rolling great impediment exists a two-phase solid solution alloying elements and particles does not affect the ferrite rolling texture components, but a solid solution alloy elements and the presence of two-phase particles can affect the degree of ferrite grains in the rolling process to stabilize the orientation of rotating them. ri, Nl1 added to help ferritic rolling texture to stabilize the rotation orientation;
(3) thermal processing. Such as low carbon steel with finishing temperature lower when ferrite region rolling, {111} recrystallization texture will be significantly enhanced;
(4) cold rolling reduction;
(5) annealing process, including temperature and time.
1 Materials and methods
Experimental ultra-low carbon steel is Crl8 ferrite laboratory vacuum induction furnace and rolling of the three components of 409 stainless steel plate. Cast ingot was forged blank size is 30mm thick x240mm wide × (560 ~ 660) mm long, for three billets were six times rolled, the heating temperature 1070 ℃, finishing temperature 851 ℃, hot-rolled total pressure under 88%, the hot rolled sheet having a thickness of 3.5mm, and finally cold rolled to 1.0mm sheet.
Taking into 1mm thick cold-rolled sheet width x28mm x20mm long rectangular specimen, wherein the length direction is the rolling direction. With a salt bath furnace at 850 ℃ cold rolled specimens condition 0 ~ 15min isothermal annealing at different times, according to the reply recrystallization stage determine the degree of change in hardness curve complete recrystallization, select Done to continue holding 3min after recrystallization sample extend the cut direction 7mm, polished to 1500 grit grinding section, the final adoption FeC1: HC1: H, O mass ratio of 1:10:20 in etchant etching, optical microscope photographs, According to GB / T6394-2002 ~ determination of the average grain size of metal "in grain size rating.
2 Results and discussion
Cr18-3 with the other two different orientations of its fiber texture density strength of 12.247. The reason may be Nb leads to inhibition of recrystallization texture development is not sufficient, while the original {001} texture strong, disappeared in the subsequent stage of the annealing is slow, still leave a certain proportion of damage formability Cr18-1 {001} <110> orientation texture.
Mechanical properties of ultra-low carbon 304 stainless steel sheets Cr18 annealed cold rolled sheet and formability of experimental data, the yield strength of Nb single stable Cr18-1 annealed cold rolled sheet and the highest tensile strength, and Ti, Nb double stabilized Cr18-2 secondly, ] ri single stable Crl8-3 lowest strength.
3 Conclusions
(1) Nb single stabilized recrystallized grains Crl8 cold rolled sheet after annealing treatment was small, high yield and tensile strength, but poor formability, r value is low, reach deep drawing timber requirements.
(2) Although the ri single stabilized Crl8 recrystallized grain size of the largest cold-rolled sheet, the intensity is not high, but the plastic is best conducive to forming properties of the {111} plane texture orientation density higher strength, its r value can reach 1.55, in line with the requirements of deep-drawing timber.
(3) Ti, Nb double stabilized recrystallized grain size Crl8 moderate cold rolled sheet, the r value reached 1.48, in line with the requirements of deep-drawing timber.
Average grain diameter and grain size level are: 0.18Nb; (e) Crl8-3,0.21Ti add Crl8 ferritic stainless steel cold rolled sheet grain 0.29% Nb of most small and uniform, because Nb in steel solid solution existence and carbonitride precipitation and steel C, N phase formation of niobium, Nb atoms in solid solution enrichment at the grain boundaries, and the lower the grain, so niobium has strongly drag the grain boundary mobility, this effect is much higher than the solution of titanium. In addition, the small dispersed niobium carbonitride NbC, NbN, Nb (CN) can stop pinning dislocations and subgrain boundary migration of grain growth with a strong impediment.
(1) chemical composition. Increasing the chromium content ferritic stainless steel can be formed in favor of forming properties of texture components in the plate rolling process, the stabilizing elements Nh will strengthen austenite deformation texture, which led to a transformation texture y strengthening;
(2) solid solution elements and two-phase particles. Solute C atom of rotation ferrite grains rolling great impediment exists a two-phase solid solution alloying elements and particles does not affect the ferrite rolling texture components, but a solid solution alloy elements and the presence of two-phase particles can affect the degree of ferrite grains in the rolling process to stabilize the orientation of rotating them. ri, Nl1 added to help ferritic rolling texture to stabilize the rotation orientation;
(3) thermal processing. Such as low carbon steel with finishing temperature lower when ferrite region rolling, {111} recrystallization texture will be significantly enhanced;
(4) cold rolling reduction;
(5) annealing process, including temperature and time.
1 Materials and methods
Experimental ultra-low carbon steel is Crl8 ferrite laboratory vacuum induction furnace and rolling of the three components of 409 stainless steel plate. Cast ingot was forged blank size is 30mm thick x240mm wide × (560 ~ 660) mm long, for three billets were six times rolled, the heating temperature 1070 ℃, finishing temperature 851 ℃, hot-rolled total pressure under 88%, the hot rolled sheet having a thickness of 3.5mm, and finally cold rolled to 1.0mm sheet.
Taking into 1mm thick cold-rolled sheet width x28mm x20mm long rectangular specimen, wherein the length direction is the rolling direction. With a salt bath furnace at 850 ℃ cold rolled specimens condition 0 ~ 15min isothermal annealing at different times, according to the reply recrystallization stage determine the degree of change in hardness curve complete recrystallization, select Done to continue holding 3min after recrystallization sample extend the cut direction 7mm, polished to 1500 grit grinding section, the final adoption FeC1: HC1: H, O mass ratio of 1:10:20 in etchant etching, optical microscope photographs, According to GB / T6394-2002 ~ determination of the average grain size of metal "in grain size rating.
2 Results and discussion
Cr18-3 with the other two different orientations of its fiber texture density strength of 12.247. The reason may be Nb leads to inhibition of recrystallization texture development is not sufficient, while the original {001} texture strong, disappeared in the subsequent stage of the annealing is slow, still leave a certain proportion of damage formability Cr18-1 {001} <110> orientation texture.
3 Conclusions
(1) Nb single stabilized recrystallized grains Crl8 cold rolled sheet after annealing treatment was small, high yield and tensile strength, but poor formability, r value is low, reach deep drawing timber requirements.
(2) Although the ri single stabilized Crl8 recrystallized grain size of the largest cold-rolled sheet, the intensity is not high, but the plastic is best conducive to forming properties of the {111} plane texture orientation density higher strength, its r value can reach 1.55, in line with the requirements of deep-drawing timber.
(3) Ti, Nb double stabilized recrystallized grain size Crl8 moderate cold rolled sheet, the r value reached 1.48, in line with the requirements of deep-drawing timber.
Average grain diameter and grain size level are: 0.18Nb; (e) Crl8-3,0.21Ti add Crl8 ferritic stainless steel cold rolled sheet grain 0.29% Nb of most small and uniform, because Nb in steel solid solution existence and carbonitride precipitation and steel C, N phase formation of niobium, Nb atoms in solid solution enrichment at the grain boundaries, and the lower the grain, so niobium has strongly drag the grain boundary mobility, this effect is much higher than the solution of titanium. In addition, the small dispersed niobium carbonitride NbC, NbN, Nb (CN) can stop pinning dislocations and subgrain boundary migration of grain growth with a strong impediment.
2014年12月6日星期六
Stainless steel smelting technology Introduction
Stainless steel has many excellent performance, attractive appearance, long life, can be 100% recycled, it can be widely applied.
Stainless steel smelting technology advances, especially after the 1960s, refining and continuous casting technology used to further promote the rapid development of stainless steel, and improve the quality of stainless steel to improve the yield and reduce production costs.
China from the early 1950s to begin production of Cold rolled stainless steel, with 3t EAF was no refining and continuous casting equipment, the annual output of only a few hundred tons to thousands of tons, quality, variety, and cost can not meet the requirements. Since the 20th century, 80 years, Taiyuan Iron and Steel Research Institute and other units of the company took the lead in refining technology developed outside China AOD furnace. Subsequently, each special steel has accounted installed outside 18-40tAOD and 15-60tVOD refining equipment, refined than it can be significantly improved. Before 1985, China has been using stainless steel ingot molded behind. TISCO 1280 vertical continuous casting machine into operation after 1985, Steel Factory, Chongqing Special Steel and steel Wuchang there have slab, billet caster cast production. In 1989, Chengdu Seamless Steel Tube Plant production of stainless steel 304 csp caster level, the end of our stainless steel ingot completely molded history. However, due to various reasons, the Chinese steel annual output has been hovering at around 300 000 t, stainless steel smelting technology progress is slow, seriously hampered the development of China's stainless steel. Since 2000, the state of the steel industry structure adjustment, adopted a series of policies and measures to encourage the development of the stainless steel industry, the Chinese stainless steel production by leaps and bounds, from 1999 to 350 000 t in 2003 to grow to 1.778 million t average annual growth rate of about 50 percent, were ranked as the world's four largest producer of stainless steel.
Development AOD furnace equipment and technology
AOD refining furnace is the main equipment of stainless steel, about 1-175tAOD furnace world's 155 units, of which 1/2 in stainless steel plant, the rest of the foundry. AOD refining stainless steel production accounts for more than 80 percent of the world stainless steel.
China's first 18tAOD furnace since September 1983 and put into production, currently about 1-40tAOD furnace more than 20 seats, of which more than 18t AOD furnace total of eight (including TISCO 3x40t, Dalian 1x40t, Pudong 1x30t, the steel Wuchang 1x18t Great Wall 118t and should reach lx18t etc.). In 2004, the steel Wuchang 60tAOD on a steel plant furnaces and furnace production 120tAOD make China AOD furnace equipment level has been significantly improved.
TISCO is China's earliest use of AOD furnace steel production enterprises, the AOD furnace has a total production of stainless steel over 200 million t, accumulated a lot of experience. In order to further expand production capacity, TISCO 18tAOD furnace for implementing transformation twice. After first transformation, AOD furnace volume expanded by 18t 40t, the production capacity increased from 160 000 t to 400 000 t. 2004 implementation of the second reconstruction, the furnace capacity is further expanded to 45t, additional top-blown lance, shortening the smelting time; the introduction of VAI expert automation control system to improve the control precision smelting; reduce ammonia consumption, increased dust dust blower capacity, improve the quality of the environment. After two transformation, TISCO AOD furnace equipment reached the international advanced level. In addition, TISCO also plans to implement environmental projects yen loans, 6 18t of EAF will be transformed into a 90t UHP EAF technology, which not only eliminates the slow pace of steel production bottlenecks, but also to further increase production capacity to 500 000 t, greatly improved the quality of the environment, to achieve a truly clean production.
In recent years, Chinese production operations AOD technology has made significant achievements, major progress as follows:
Improve (1) Lining Life
AOD furnace lining life AOD is the main technical and economic indicators of production, after years of technical research, especially in improving the operation of the process (for example, reducing the furnace when the silicon content of the steel, the improvement AOD slag system, decarbonization of alkalinity increase from 0.5 to 1.0, the reduction of alkalinity increase from 0.8-1.0 to 2.0-3.5 and improve aspects of high quality refractory construction process, and so do a lot of work, AOD lining life in general has improved. TISCO AOD furnace lining life of an average of 110 times the maximum 130 times, including the use of TISCO production of refractories average life expectancy of 92 times.
Improvement (2) desulfurization
China AOD furnace slag mostly single-blowing process. To reduce the S content in steel, using the quick-S process, refining slag basicity of about 2.5, ladle add SiCa, the use of a strong stirring effect desulfurization of steel, the steel in an appropriate amount of residual calcium. The improved AOD process, desulfurization rate of 70%. Currently, TISCO stainless steel sulfur content of 0.005% or less stable at an average of 0.0034%.
(3) N-containing stainless steel smelting
N-containing nitrogen-alloyed stainless steel mainly in two ways: First, the addition of nitrogen and manganese, chromium nitride alloy alloying, the second is the direct alloying with nitrogen, which have lower production costs. AOD furnace can direct alloying with nitrogen, therefore, has the great advantage of stainless steel smelting. TISCO application 40tAOD furnace 18t and dissolved nitrogen in stainless steel, the removal of theory, a nitrogen alloying process model, does not require on-line analysis of steel smelting nitrogen content in the finished product will be able to more precisely control the nitrogen content, control precision ± 0.0135%. Currently, TISCO has applied the model mass OCr19Ni9N directly with nitrogen alloying method, OCr19Ni9NbN, 1Cr17Mn6Ni5N, 00Cr18Ni5Mo3Si2N and 00Cr22Ni5Mo3N and other nitrogen-containing stainless steel. In 2003, the production of various types of stainless steel containing N 35000 t, and achieved significant economic benefits.
(4) the use of AOD dust
Amount of dust AOD furnace smelting of steel production by 0.7% -1.0%, generally AOD dust containing Cr2O315%, NiO4%, CaO26%, Fe27%, MgO15%, and other substances, dust particle ≤20μm, Cr2O3 and dust NiO is precious metal oxides. If recycling is not only a waste of resources, would pollute the environment. So, how to recycle the dust AOD Cr, Ni two things are important issues for each stainless steel mills.
TISCO recovery process is used by the study by sic amount of dust also required mixed oxide forming, after drying 200 ℃ to the medium frequency induction melting furnace reduction, high C cast nickel-chromium alloy (Cr13% -Ni6% ), then returned to the smelting furnace, recovered by this method AOD furnace dust has achieved good economic results.
Progress molten steel smelting technology
China is a developing country. Scrap steel, especially stainless steel scrap savings amount is small, therefore, to develop with all or part of the iron smelting iron stainless steel plant in China's goal is to have three factories with iron smelting steel in the world, including Japan's Nippon Steel Yawata plant, JFE Group Kawasaki and Chiba plant in Brazil Acesita plant. TISCO in China built a molten iron as the main raw material of the three-step process for the production of hot metal in 2003 that desiliconizing dephosphorization pretreatment -30tUHP furnace pre-fluxing -75tK-OBM-S LBE -80tVOD decarbonization refining refining 80tLF - bending Type square slab caster. The key equipment from Japan's JFE Group of hot metal pretreatment Kawasaki introduced, 75tK-B0M-S converter imported from VAI, 80tVOD imported from Danieli, design stainless steel production 55t this production line.
The smelting of stainless steel has the following characteristics:
(1) raw materials and flexible, can be used both pre-fluxing EAF (15-30t) + part dephosphorization of hot metal (30-50t), but also all with hot metal dephosphorization (65t) Stainless steel smelting;
(2) BOF larger capacity can ensure smooth operation without causing splashing;
(3) top lance gun position control, can achieve high speed and after CO decarburization blowing operation, to ensure that the thermal energy required smelting operations;
(4) at the bottom outlet of the cooling gas flow and pressure can be controlled individually, in order to ensure optimal cooling and prolong the service life of the tuyere;
(5) the use of VAI-CON-TEMP continuous temperature measurement devices;
(6) the use of pneumatic slag and slag IRIS measurement system to reduce the excessive amount of steel slag to ensure that the next step along the line VOD operations;
(7) the use of advanced LevelII automatic control systems and software models to ensure automatic control when smelting steel, stainless steel quality improve.
After a year of practice, TISCO basically mastered the K-OBM-S converter steel process, achieved the following results:
(1) K-OBIII-S original design output of 350 000 t / a, put into operation since April 2003, when the production of stainless steel 260 500 t, 2004 was installed K-OBNI-S BOF shell replacement vehicle, shortening the furnace shell replacement time. After the completion of the transformation, stainless steel design production was 550 000 t / a.
(2) lining life continues to improve, up from about the beginning of the current 200 to nearly 700, the bottom is also rising life expectancy, from 50 at the start to the current nearly 300 times (each lining replacement 2- 3 bottom).
(3) a significant reduction in the consumption of hydrogen discharge, the original design of 304 stainless steel smelting hydrogen consumption for 8m3 / t, and now the whole process to the bottom outlet N2 generation Ar, achieved significant economic benefits.
(4) to cancel the alloy melting furnace process, the implementation of 100% hot metal dephosphorization, ferrochrome smelting All 400 series stainless steel two-step production process within the converter added significantly reduce production costs.
(5) As a result of de-P iron smelting stainless steel P content below to scrap as the main raw material of stainless steel smelting, steel, As, Su, Cu and other harmful elements are also greatly reduced.
Baosteel Group, a steel plant with an annual output of 720 000 t of molten iron and chrome water as the main raw material of a stainless steel production line has been put into production. The process route is a pre-melting furnace hot metal pretreatment -100tUHP water and ferrochrome alloy -120tVOD -120tVOD refining refining - continuous casting. The line converter using AOD-L. This production line is put into operation to further improve the Chinese stainless steel with iron smelting technology.
Advances in Continuous Casting Technology
China stainless steel casting technology starting late, until 1985, TISCO production of China's first stainless steel vertical slab caster. Because of this single furnace caster casting off cutting mode, ladle capacity of only 18t, the highest annual output is only 58,000 t, can not achieve full casting production. In 1999, TISCO decided this caster implementation of technological innovation. Its purpose is to increase the transformation of the ladle and tundish capacity, multi-cutting mode using online casting furnace, change two cooling methods, improving the quality of the slab. In 2004, they decided to implement this caster second transformation. The purpose of this transformation is to increase the slab thickness specifications to 200mm, improve casting quality, reduce the slab grinding losses. Its main content is to mold oscillation mode to DYNAFLEX hydraulic vibration, granulated slag secondary cooling system to protect the implementation of dynamic cooling (DYNACS), install a Q VAI quality control expert system, automatic addition of additional devices and printers slab.
After transformation, TISCO has made progress in the casting process following aspects:
(1) stainless steel casting ratio improved significantly. Vertical caster casting ratio increased from 51.4 percent in 1999 to 97.5 percent in 2003.
(2) significantly increased the number of continuous casting furnace. For 304 steel, the even number 6 furnace casting furnace above the slab yield 2.37 percentage increase, on average 96.97%.
Stainless steel smelting technology advances, especially after the 1960s, refining and continuous casting technology used to further promote the rapid development of stainless steel, and improve the quality of stainless steel to improve the yield and reduce production costs.
China from the early 1950s to begin production of Cold rolled stainless steel, with 3t EAF was no refining and continuous casting equipment, the annual output of only a few hundred tons to thousands of tons, quality, variety, and cost can not meet the requirements. Since the 20th century, 80 years, Taiyuan Iron and Steel Research Institute and other units of the company took the lead in refining technology developed outside China AOD furnace. Subsequently, each special steel has accounted installed outside 18-40tAOD and 15-60tVOD refining equipment, refined than it can be significantly improved. Before 1985, China has been using stainless steel ingot molded behind. TISCO 1280 vertical continuous casting machine into operation after 1985, Steel Factory, Chongqing Special Steel and steel Wuchang there have slab, billet caster cast production. In 1989, Chengdu Seamless Steel Tube Plant production of stainless steel 304 csp caster level, the end of our stainless steel ingot completely molded history. However, due to various reasons, the Chinese steel annual output has been hovering at around 300 000 t, stainless steel smelting technology progress is slow, seriously hampered the development of China's stainless steel. Since 2000, the state of the steel industry structure adjustment, adopted a series of policies and measures to encourage the development of the stainless steel industry, the Chinese stainless steel production by leaps and bounds, from 1999 to 350 000 t in 2003 to grow to 1.778 million t average annual growth rate of about 50 percent, were ranked as the world's four largest producer of stainless steel.
Development AOD furnace equipment and technology
AOD refining furnace is the main equipment of stainless steel, about 1-175tAOD furnace world's 155 units, of which 1/2 in stainless steel plant, the rest of the foundry. AOD refining stainless steel production accounts for more than 80 percent of the world stainless steel.
China's first 18tAOD furnace since September 1983 and put into production, currently about 1-40tAOD furnace more than 20 seats, of which more than 18t AOD furnace total of eight (including TISCO 3x40t, Dalian 1x40t, Pudong 1x30t, the steel Wuchang 1x18t Great Wall 118t and should reach lx18t etc.). In 2004, the steel Wuchang 60tAOD on a steel plant furnaces and furnace production 120tAOD make China AOD furnace equipment level has been significantly improved.
TISCO is China's earliest use of AOD furnace steel production enterprises, the AOD furnace has a total production of stainless steel over 200 million t, accumulated a lot of experience. In order to further expand production capacity, TISCO 18tAOD furnace for implementing transformation twice. After first transformation, AOD furnace volume expanded by 18t 40t, the production capacity increased from 160 000 t to 400 000 t. 2004 implementation of the second reconstruction, the furnace capacity is further expanded to 45t, additional top-blown lance, shortening the smelting time; the introduction of VAI expert automation control system to improve the control precision smelting; reduce ammonia consumption, increased dust dust blower capacity, improve the quality of the environment. After two transformation, TISCO AOD furnace equipment reached the international advanced level. In addition, TISCO also plans to implement environmental projects yen loans, 6 18t of EAF will be transformed into a 90t UHP EAF technology, which not only eliminates the slow pace of steel production bottlenecks, but also to further increase production capacity to 500 000 t, greatly improved the quality of the environment, to achieve a truly clean production.
In recent years, Chinese production operations AOD technology has made significant achievements, major progress as follows:
Improve (1) Lining Life
AOD furnace lining life AOD is the main technical and economic indicators of production, after years of technical research, especially in improving the operation of the process (for example, reducing the furnace when the silicon content of the steel, the improvement AOD slag system, decarbonization of alkalinity increase from 0.5 to 1.0, the reduction of alkalinity increase from 0.8-1.0 to 2.0-3.5 and improve aspects of high quality refractory construction process, and so do a lot of work, AOD lining life in general has improved. TISCO AOD furnace lining life of an average of 110 times the maximum 130 times, including the use of TISCO production of refractories average life expectancy of 92 times.
Improvement (2) desulfurization
China AOD furnace slag mostly single-blowing process. To reduce the S content in steel, using the quick-S process, refining slag basicity of about 2.5, ladle add SiCa, the use of a strong stirring effect desulfurization of steel, the steel in an appropriate amount of residual calcium. The improved AOD process, desulfurization rate of 70%. Currently, TISCO stainless steel sulfur content of 0.005% or less stable at an average of 0.0034%.
(3) N-containing stainless steel smelting
N-containing nitrogen-alloyed stainless steel mainly in two ways: First, the addition of nitrogen and manganese, chromium nitride alloy alloying, the second is the direct alloying with nitrogen, which have lower production costs. AOD furnace can direct alloying with nitrogen, therefore, has the great advantage of stainless steel smelting. TISCO application 40tAOD furnace 18t and dissolved nitrogen in stainless steel, the removal of theory, a nitrogen alloying process model, does not require on-line analysis of steel smelting nitrogen content in the finished product will be able to more precisely control the nitrogen content, control precision ± 0.0135%. Currently, TISCO has applied the model mass OCr19Ni9N directly with nitrogen alloying method, OCr19Ni9NbN, 1Cr17Mn6Ni5N, 00Cr18Ni5Mo3Si2N and 00Cr22Ni5Mo3N and other nitrogen-containing stainless steel. In 2003, the production of various types of stainless steel containing N 35000 t, and achieved significant economic benefits.
(4) the use of AOD dust
Amount of dust AOD furnace smelting of steel production by 0.7% -1.0%, generally AOD dust containing Cr2O315%, NiO4%, CaO26%, Fe27%, MgO15%, and other substances, dust particle ≤20μm, Cr2O3 and dust NiO is precious metal oxides. If recycling is not only a waste of resources, would pollute the environment. So, how to recycle the dust AOD Cr, Ni two things are important issues for each stainless steel mills.
TISCO recovery process is used by the study by sic amount of dust also required mixed oxide forming, after drying 200 ℃ to the medium frequency induction melting furnace reduction, high C cast nickel-chromium alloy (Cr13% -Ni6% ), then returned to the smelting furnace, recovered by this method AOD furnace dust has achieved good economic results.
Progress molten steel smelting technology
China is a developing country. Scrap steel, especially stainless steel scrap savings amount is small, therefore, to develop with all or part of the iron smelting iron stainless steel plant in China's goal is to have three factories with iron smelting steel in the world, including Japan's Nippon Steel Yawata plant, JFE Group Kawasaki and Chiba plant in Brazil Acesita plant. TISCO in China built a molten iron as the main raw material of the three-step process for the production of hot metal in 2003 that desiliconizing dephosphorization pretreatment -30tUHP furnace pre-fluxing -75tK-OBM-S LBE -80tVOD decarbonization refining refining 80tLF - bending Type square slab caster. The key equipment from Japan's JFE Group of hot metal pretreatment Kawasaki introduced, 75tK-B0M-S converter imported from VAI, 80tVOD imported from Danieli, design stainless steel production 55t this production line.
The smelting of stainless steel has the following characteristics:
(1) raw materials and flexible, can be used both pre-fluxing EAF (15-30t) + part dephosphorization of hot metal (30-50t), but also all with hot metal dephosphorization (65t) Stainless steel smelting;
(2) BOF larger capacity can ensure smooth operation without causing splashing;
(3) top lance gun position control, can achieve high speed and after CO decarburization blowing operation, to ensure that the thermal energy required smelting operations;
(4) at the bottom outlet of the cooling gas flow and pressure can be controlled individually, in order to ensure optimal cooling and prolong the service life of the tuyere;
(5) the use of VAI-CON-TEMP continuous temperature measurement devices;
(6) the use of pneumatic slag and slag IRIS measurement system to reduce the excessive amount of steel slag to ensure that the next step along the line VOD operations;
(7) the use of advanced LevelII automatic control systems and software models to ensure automatic control when smelting steel, stainless steel quality improve.
After a year of practice, TISCO basically mastered the K-OBM-S converter steel process, achieved the following results:
(1) K-OBIII-S original design output of 350 000 t / a, put into operation since April 2003, when the production of stainless steel 260 500 t, 2004 was installed K-OBNI-S BOF shell replacement vehicle, shortening the furnace shell replacement time. After the completion of the transformation, stainless steel design production was 550 000 t / a.
(2) lining life continues to improve, up from about the beginning of the current 200 to nearly 700, the bottom is also rising life expectancy, from 50 at the start to the current nearly 300 times (each lining replacement 2- 3 bottom).
(3) a significant reduction in the consumption of hydrogen discharge, the original design of 304 stainless steel smelting hydrogen consumption for 8m3 / t, and now the whole process to the bottom outlet N2 generation Ar, achieved significant economic benefits.
(4) to cancel the alloy melting furnace process, the implementation of 100% hot metal dephosphorization, ferrochrome smelting All 400 series stainless steel two-step production process within the converter added significantly reduce production costs.
(5) As a result of de-P iron smelting stainless steel P content below to scrap as the main raw material of stainless steel smelting, steel, As, Su, Cu and other harmful elements are also greatly reduced.
Baosteel Group, a steel plant with an annual output of 720 000 t of molten iron and chrome water as the main raw material of a stainless steel production line has been put into production. The process route is a pre-melting furnace hot metal pretreatment -100tUHP water and ferrochrome alloy -120tVOD -120tVOD refining refining - continuous casting. The line converter using AOD-L. This production line is put into operation to further improve the Chinese stainless steel with iron smelting technology.
Advances in Continuous Casting Technology
China stainless steel casting technology starting late, until 1985, TISCO production of China's first stainless steel vertical slab caster. Because of this single furnace caster casting off cutting mode, ladle capacity of only 18t, the highest annual output is only 58,000 t, can not achieve full casting production. In 1999, TISCO decided this caster implementation of technological innovation. Its purpose is to increase the transformation of the ladle and tundish capacity, multi-cutting mode using online casting furnace, change two cooling methods, improving the quality of the slab. In 2004, they decided to implement this caster second transformation. The purpose of this transformation is to increase the slab thickness specifications to 200mm, improve casting quality, reduce the slab grinding losses. Its main content is to mold oscillation mode to DYNAFLEX hydraulic vibration, granulated slag secondary cooling system to protect the implementation of dynamic cooling (DYNACS), install a Q VAI quality control expert system, automatic addition of additional devices and printers slab.
After transformation, TISCO has made progress in the casting process following aspects:
(1) stainless steel casting ratio improved significantly. Vertical caster casting ratio increased from 51.4 percent in 1999 to 97.5 percent in 2003.
(2) significantly increased the number of continuous casting furnace. For 304 steel, the even number 6 furnace casting furnace above the slab yield 2.37 percentage increase, on average 96.97%.
2014年12月3日星期三
Antibacterial stainless steel
In the production of kitchen equipment, medical equipment, toiletries and cleaning decoration, people have been looking forward to both the shape of the metal new antibacterial material can appear.
Both structural and functional properties of new materials - both antibacterial stainless steel mechanical properties of structural materials, functional materials have physical and chemical properties, it is like that with the general 409 stainless steel plate decorative and landscaping as a member, as well as anti-bacterial self-cleaning effect of sterilization.
Data show now widely used antibacterial agent mainly organic antibacterial agents and inorganic antibacterial agent categories. Organic antibacterial agent has a long history in the medical field has been widely used, mainly in the use of spray or immersion. But they are in safety, durability, broad-spectrum antimicrobial resistance, heat resistance insufficient, especially for serious damage to humans and the environment can not be used on many occasions. Inorganic antimicrobial agent is mainly used as an additive, made with antibacterial fabric, plastic products, activated carbon, sanitary ceramics, etc., use of increasingly widespread. But in the heat, wear and corrosion resistance, strength and formability, can not meet the many needs of everyday use. Therefore, in the manufacture of kitchen machinery, medical equipment, bathroom cleaning supplies and carry out renovation, you must use has an antibacterial effect and shapes, appearance of metal products. This 304 stainless steel coil has antibacterial effect of the new birth, is an ideal product in people's minds.
Antibacterial stainless steel produced by antimicrobial resistance is divided into two types: type and their antimicrobial coating type. The former can be modified existing stainless steel products, i.e., on a stainless steel plated with a metal material with a germicidal, bactericidal effect, or other inorganic material, but the drawback is easy to wear, easy to aging, temperature changes and with the external environment and change, so that the loss of antibacterial stainless steel; the latter is added in the stainless steel production process some of the metallic elements having antimicrobial activity, through special processing to make antibacterial stainless steel itself, it does not have the disadvantages of the former, and low cost, easy to processing.
99.9% kill rate of E. coli, Staphylococcus aureus killing rate of 99.5%, 99.0% kill rate of Candida albicans, Kuhei bacteria kill rate of 86.6%. Common sense tells us that four kinds of bacteria are the most common ordinary life, to achieve such a killing effect, demonstrated broad-spectrum antibacterial antibacterial stainless steel.
With the material composition and microstructure of the adjustment and optimization, will further enhance the antibacterial effect. Antibacterial in an aqueous solution / antibacterial test, the antibacterial stainless steel test piece was immersed in the prepared bacteria liquid, by soaking at different times after the bacteria was observed in the number of colonies. The results showed that E. coli and Staphylococcus aureus killing rate of 90% -95%, indicating that the material in an aqueous solution can kill bacteria. That is not only able to kill bacteria in direct contact, but also to kill bacteria without direct contact through the diffusion of the solution.
Currently materials in the field for the "sterilization" and "antibacterial" there is no clear definition. Generally understood to inhibit bacterial antimicrobial development, growth and reproduction, sterilization is to kill microorganisms. Antibacterial stainless steel can not make it on the attached bacteria multiply, the bacteria are killed or inhibited at low level state, but does not change the intensity of ordinary stainless steel, corrosion resistance, aesthetic features, has a very broad application prospects. Look forward into people's homes.
Both structural and functional properties of new materials - both antibacterial stainless steel mechanical properties of structural materials, functional materials have physical and chemical properties, it is like that with the general 409 stainless steel plate decorative and landscaping as a member, as well as anti-bacterial self-cleaning effect of sterilization.
Data show now widely used antibacterial agent mainly organic antibacterial agents and inorganic antibacterial agent categories. Organic antibacterial agent has a long history in the medical field has been widely used, mainly in the use of spray or immersion. But they are in safety, durability, broad-spectrum antimicrobial resistance, heat resistance insufficient, especially for serious damage to humans and the environment can not be used on many occasions. Inorganic antimicrobial agent is mainly used as an additive, made with antibacterial fabric, plastic products, activated carbon, sanitary ceramics, etc., use of increasingly widespread. But in the heat, wear and corrosion resistance, strength and formability, can not meet the many needs of everyday use. Therefore, in the manufacture of kitchen machinery, medical equipment, bathroom cleaning supplies and carry out renovation, you must use has an antibacterial effect and shapes, appearance of metal products. This 304 stainless steel coil has antibacterial effect of the new birth, is an ideal product in people's minds.
Antibacterial stainless steel produced by antimicrobial resistance is divided into two types: type and their antimicrobial coating type. The former can be modified existing stainless steel products, i.e., on a stainless steel plated with a metal material with a germicidal, bactericidal effect, or other inorganic material, but the drawback is easy to wear, easy to aging, temperature changes and with the external environment and change, so that the loss of antibacterial stainless steel; the latter is added in the stainless steel production process some of the metallic elements having antimicrobial activity, through special processing to make antibacterial stainless steel itself, it does not have the disadvantages of the former, and low cost, easy to processing.
99.9% kill rate of E. coli, Staphylococcus aureus killing rate of 99.5%, 99.0% kill rate of Candida albicans, Kuhei bacteria kill rate of 86.6%. Common sense tells us that four kinds of bacteria are the most common ordinary life, to achieve such a killing effect, demonstrated broad-spectrum antibacterial antibacterial stainless steel.
With the material composition and microstructure of the adjustment and optimization, will further enhance the antibacterial effect. Antibacterial in an aqueous solution / antibacterial test, the antibacterial stainless steel test piece was immersed in the prepared bacteria liquid, by soaking at different times after the bacteria was observed in the number of colonies. The results showed that E. coli and Staphylococcus aureus killing rate of 90% -95%, indicating that the material in an aqueous solution can kill bacteria. That is not only able to kill bacteria in direct contact, but also to kill bacteria without direct contact through the diffusion of the solution.
Currently materials in the field for the "sterilization" and "antibacterial" there is no clear definition. Generally understood to inhibit bacterial antimicrobial development, growth and reproduction, sterilization is to kill microorganisms. Antibacterial stainless steel can not make it on the attached bacteria multiply, the bacteria are killed or inhibited at low level state, but does not change the intensity of ordinary stainless steel, corrosion resistance, aesthetic features, has a very broad application prospects. Look forward into people's homes.
2014年11月30日星期日
Teach you how to identify counterfeit steel method
As we all know: a 409 stainless steel plate building as the human skeleton, which supports the building. If the steel is a problem, then the network architecture will certainly be a problem. Thus the steel quality directly affects people's lives and property safety.
Here we take a look at what some of the methods to identify fake steel:
1. Shoddy steel prone to folding. Folding is formed on the surface of a variety of steel fold, this defect often throughout the product vertical. The reason is due to shoddy manufacturers of folding the pursuit of high efficiency, reduction is too large, resulting in the ears, it creates a rolling when folded down, it will crack when folded products bending, the strength of steel big drop.
2. Steel is often shoddy appearance Pock phenomenon. Pock is caused due to a serious groove worn steel surface uneven irregular defects. Because of shoddy steel manufacturers have to pursue profits rolling groove most often exceeded.
3. Shoddy steel surface is easy to produce scarring. There are two reasons: 1. Uneven shoddy steel materials, impurities. 2. Shoddy material manufacturers guides poorly equipped, easy to stick steel, easy to produce scarring after the roll bite of these impurities.
4. Shoddy material surface easy to crack because it is blank adobe, adobe many pores, adobe in the cooling process due to thermal stress, cracks, after rolling there cracks.
5. Shoddy steel easily scratched because shoddy material equipment is very easy to produce burrs, scratches steel surface. Deep scratches reduce the strength of steel.
6. No shoddy steel metallic luster, pale red color of pig iron or similar, there are two two reasons, it is adobe blank. 2, shoddy-rolling temperature is not standard, they are visually steel temperature, so the region can not be prescribed by the austenite rolling, natural properties of steel can not be reached.
7. Transverse reinforcement steel thin shoddy low, often sufficient dissatisfaction phenomenon, because manufacturers to achieve large negative tolerance, finished in front of a few larger reduction, iron-type small, hole filling dissatisfaction.
8. Shoddy magnetism stainless steel oval cross-section, because the manufacturers in order to save material, the first two tracks finished roll reduction is too large, the strength of this steel is greatly decreased, and does not conform to the standard dimensions of rebar.
9. Uniform quality steel components, high tonnage cold shears, cut the first end surface smooth and tidy, but due to poor material shoddy material, there are often cut off the meat first end face of the phenomenon, namely uneven, and no metallic sheen. And because of shoddy little head cut wood product manufacturers, end to end will be a big ears.
10. Shoddy steel material containing impurities, the density of steel is small, and size tolerance serious, so in the absence of a vernier caliper case, you can check it weighed. For example, for steel 20 national standards set forth in the most negative tolerance of 5%, while its length 9M single theoretical weight of 120 kg, its minimal weight should be: 120X (l-5%) = 114 kg, weigh out the actual weight of a single smaller than 114 kg, it is shoddy steel, because it is more than 5% negative tolerance. Generally the whole amount commensurate would be better, mainly taking into account the cumulative error and probability theory problem.
11. Diameter size shoddy steel fluctuations due; l, steel surface temperature instability of yin and yang. 2, the non-uniform composition of the steel. 3, due to poor equipment, low-intensity ground, rolling big bounce. There will be changes in the larger inner diameter of the same week, so easy to produce steel discontinuity break.
12. Trademarks and printing high-quality materials are relatively standardized.
13. Three steel 16 or larger diameter screw spacing between the two trademarks are over IM.
14. Inferior longitudinal reinforcement steel rebar often wavy.
15. Shoddy steel manufacturers because there is no traffic, so the package is relatively loose. Side of the oval.
Here we take a look at what some of the methods to identify fake steel:
1. Shoddy steel prone to folding. Folding is formed on the surface of a variety of steel fold, this defect often throughout the product vertical. The reason is due to shoddy manufacturers of folding the pursuit of high efficiency, reduction is too large, resulting in the ears, it creates a rolling when folded down, it will crack when folded products bending, the strength of steel big drop.
2. Steel is often shoddy appearance Pock phenomenon. Pock is caused due to a serious groove worn steel surface uneven irregular defects. Because of shoddy steel manufacturers have to pursue profits rolling groove most often exceeded.
3. Shoddy steel surface is easy to produce scarring. There are two reasons: 1. Uneven shoddy steel materials, impurities. 2. Shoddy material manufacturers guides poorly equipped, easy to stick steel, easy to produce scarring after the roll bite of these impurities.
4. Shoddy material surface easy to crack because it is blank adobe, adobe many pores, adobe in the cooling process due to thermal stress, cracks, after rolling there cracks.
5. Shoddy steel easily scratched because shoddy material equipment is very easy to produce burrs, scratches steel surface. Deep scratches reduce the strength of steel.
6. No shoddy steel metallic luster, pale red color of pig iron or similar, there are two two reasons, it is adobe blank. 2, shoddy-rolling temperature is not standard, they are visually steel temperature, so the region can not be prescribed by the austenite rolling, natural properties of steel can not be reached.
7. Transverse reinforcement steel thin shoddy low, often sufficient dissatisfaction phenomenon, because manufacturers to achieve large negative tolerance, finished in front of a few larger reduction, iron-type small, hole filling dissatisfaction.
8. Shoddy magnetism stainless steel oval cross-section, because the manufacturers in order to save material, the first two tracks finished roll reduction is too large, the strength of this steel is greatly decreased, and does not conform to the standard dimensions of rebar.
9. Uniform quality steel components, high tonnage cold shears, cut the first end surface smooth and tidy, but due to poor material shoddy material, there are often cut off the meat first end face of the phenomenon, namely uneven, and no metallic sheen. And because of shoddy little head cut wood product manufacturers, end to end will be a big ears.
10. Shoddy steel material containing impurities, the density of steel is small, and size tolerance serious, so in the absence of a vernier caliper case, you can check it weighed. For example, for steel 20 national standards set forth in the most negative tolerance of 5%, while its length 9M single theoretical weight of 120 kg, its minimal weight should be: 120X (l-5%) = 114 kg, weigh out the actual weight of a single smaller than 114 kg, it is shoddy steel, because it is more than 5% negative tolerance. Generally the whole amount commensurate would be better, mainly taking into account the cumulative error and probability theory problem.
11. Diameter size shoddy steel fluctuations due; l, steel surface temperature instability of yin and yang. 2, the non-uniform composition of the steel. 3, due to poor equipment, low-intensity ground, rolling big bounce. There will be changes in the larger inner diameter of the same week, so easy to produce steel discontinuity break.
12. Trademarks and printing high-quality materials are relatively standardized.
13. Three steel 16 or larger diameter screw spacing between the two trademarks are over IM.
14. Inferior longitudinal reinforcement steel rebar often wavy.
15. Shoddy steel manufacturers because there is no traffic, so the package is relatively loose. Side of the oval.
2014年11月26日星期三
Stainless steel sheet during the drawing when what features
Stainless steel products for its exquisite appearance, excellent corrosion resistance, high temperature oxidation resistance and high temperature strength and drew people of all ages, more and more widely used for decoration, light industry, civilian hardware, kitchen equipment and utensils, etc. . Due to the high quality requirements of the appearance of these products in the whole process of the product, to ensure that the product is not high surface brightness scratches and abrasions very difficult indeed, especially since stainless steel sheet drawing characteristics brought Die Selection , heat treatment, machining and process lubrication problems directly affecting product quality gold, production, costs and die life.
Features stainless steel sheet drawing
Due to the high yield point of stainless steel, high hardness, work hardening effect is remarkable, stainless steel sheet were drawing the following features:
1) due to poor thermal conductivity than ordinary low-carbon steel, resulting in deformation force required;
2)sheet drawing, the severe plastic deformation hardening, easy to wrinkle when drawing sheet, full BHF want greater;
3) sheet metal bending in the rebound and reverse pull furrow mold caused by bending at the corner, and usually forms a depression in the side wall of distortion product makes high dimensional accuracy and shape requirements of the product to achieve the required increase in plastic surgery procedures.
4) stainless steel sheet bonded tumor phenomenon drawing process prone.
From the microscopic point of view, the key panel material rough mold surfaces are uneven, due to the process of drawing BHF larger load raised by the local unit to withstand a lot of pressure parts; because between the sheet and the mold to produce relative motion and the plastic deformation of sheet metal production of heat, making the lubricating film viscosity decreases, lower intensity; protruding parts of the sheet in a high pressure, high temperature instantaneously by shearing motion, the lubricant film rupture, sheet metal in direct contact with the mold, sheet metal parts to be scraped off the mold raised bumps become part of people die in front of the debris pile protruding parts, such as the temperature is high enough so that the pieces soften, melt, dry welding in the mold to form an adhesive tumor. Bond and form a tumor is difficult to come off, and the more the bigger stick, causing deep drawing steel sheet products severe scratches left on the surface. In addition, the drawing speed, sheet deformed child size also plays an important role on the bond neoplasia. How to avoid drawing die bonding tumor formation, improve the surface quality of drawing parts are Precision stainless steel sheet drawing technical problems lies.
2 solutions
Deep drawing steel sheet bonding occurs during tumor has been plagued by production site, a great deal of trouble to producers, but due to the bonding neoplasia and other issues related to tribology, influenced by many factors. Currently, we can only propose measures from different angles to prevent tumor formation and reduce adhesion.
2.1 working part mold material selection and heat treatment
For bond tumor problem, choose a stainless steel 430ba mold material Chak relations, two points should be combined according to the pro stainless steel sheet metal and mold material: Choose one anti-adhesion strength, and second mold material wear and friction reduction. In general, the metal lattice type, lattice pitch, electron density, electrochemical properties interlinked metal, which attract each other, dissolving ability, easy to adhere together, the results of the friction coefficient becomes large. Cr, Ni and Fe miscibility big, so when using steel deep drawing, bonding tumors more susceptible to the phenomenon. Practice has proved that: use aluminum bronze, aluminum bronze hard sticking better; using Steel bonded tungsten carbide manufacturing die than raise with Cr12Mov tufftride manufacturing die life several times, and non-stick mode; if using code 3054 alloy cast iron, just mold surface flame hardening, the mold surface does not appear bond tumor. Also in vulnerable parts of the mold can be used carbide inserts, it has excellent compression performance, superior wear resistance and long-lasting love of the surface roughness and dimensional control. However, due to the price, the production used less.
Surface processing mold work portion 2.2
Stainless steel drawing die surface quality requirements are high. Low surface roughness may serve to improve the anti-friction and anti-adhesion effect so. After drawing die during the grinding process, the more important is to eliminate machining marks. In the mold is often overlooked grinding and polishing processes. It should be noted. Throughout the mold process, polishing workload should account for one third, because the appearance of quality stainless steel products depends largely on the mold polishing techniques. Reduce mold surface roughness, a corresponding reduction in the number of grinding mold, mold life correspondingly improved.
If the mold surface polishing enough, coupled with deep drawing steel sheet bonded easily cause tumor characteristics, thus drawing out of the product scratches serious. And that the scratches on the product with polished to solve time-consuming and reach results. Therefore, we should step up and down in the mold polishing great effort, only the mold surface machining accuracy is improved in order to reduce scratches, mold repair mold life can be greatly improved. In recent years, there have been a variety of new techniques of polishing and polishing tools, the development of ultrasound, electrolytic polishing, abrasive blasting, honing extrusion and other new technology, new equipment. According to information on CrWMo, 3Cr12W8V, Cr12 mold test three materials studied electrochemical polishing, polishing prove that only 5-10 minutes from the mold cavity surface roughness of the original Ra3.2-Ra1.6 down to Ra0.4-RaO.2 basis. While by electrochemical polishing may improve the surface hardness to improve wear resistance. Again, ultrasonic polishing machine can be used by soft nitriding treatment cavity fine polishing, it is easy to avoid the disadvantages of manual polishing damage nitride film. For new polishing techniques we should take active steps to use and summary.
Stainless steel drawing die surface quality requirements are high. Low surface roughness may serve to improve the anti-friction and anti-adhesion effect so. After drawing die during the grinding process, the more important is to eliminate machining marks. In the mold is often overlooked grinding and polishing processes. It should be noted. Throughout the mold process, polishing workload should account for one third, because the appearance of quality stainless steel products depends largely on the mold polishing techniques. Reduce mold surface roughness, a corresponding reduction in the number of grinding mold, mold life correspondingly improved.
If the mold surface polishing enough, coupled with deep drawing steel sheet bonded easily cause tumor characteristics, thus drawing out of the product scratches serious. And that the scratches on the product with polished to solve time-consuming and reach results. Therefore, we should step up and down in the mold polishing great effort, only the mold surface machining accuracy is improved in order to reduce scratches, mold repair mold life can be greatly improved. In recent years, there have been a variety of new techniques of polishing and polishing tools, the development of ultrasound, electrolytic polishing, abrasive blasting, honing extrusion and other new technology, new equipment. According to information on CrWMo, 3Cr12W8V, Cr12 mold test three materials studied electrochemical polishing, polishing prove that only 5-10 minutes from the mold cavity surface roughness of the original Ra3.2-Ra1.6 down to Ra0.4-RaO.2 basis. While by electrochemical polishing may improve the surface hardness to improve wear resistance. Again, ultrasonic polishing machine can be used by soft nitriding treatment cavity fine polishing, it is easy to avoid the disadvantages of manual polishing damage nitride film. For new polishing techniques we should take active steps to use and summary.
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Features stainless steel sheet drawing
Due to the high yield point of stainless steel, high hardness, work hardening effect is remarkable, stainless steel sheet were drawing the following features:
1) due to poor thermal conductivity than ordinary low-carbon steel, resulting in deformation force required;
2)sheet drawing, the severe plastic deformation hardening, easy to wrinkle when drawing sheet, full BHF want greater;
3) sheet metal bending in the rebound and reverse pull furrow mold caused by bending at the corner, and usually forms a depression in the side wall of distortion product makes high dimensional accuracy and shape requirements of the product to achieve the required increase in plastic surgery procedures.
4) stainless steel sheet bonded tumor phenomenon drawing process prone.
From the microscopic point of view, the key panel material rough mold surfaces are uneven, due to the process of drawing BHF larger load raised by the local unit to withstand a lot of pressure parts; because between the sheet and the mold to produce relative motion and the plastic deformation of sheet metal production of heat, making the lubricating film viscosity decreases, lower intensity; protruding parts of the sheet in a high pressure, high temperature instantaneously by shearing motion, the lubricant film rupture, sheet metal in direct contact with the mold, sheet metal parts to be scraped off the mold raised bumps become part of people die in front of the debris pile protruding parts, such as the temperature is high enough so that the pieces soften, melt, dry welding in the mold to form an adhesive tumor. Bond and form a tumor is difficult to come off, and the more the bigger stick, causing deep drawing steel sheet products severe scratches left on the surface. In addition, the drawing speed, sheet deformed child size also plays an important role on the bond neoplasia. How to avoid drawing die bonding tumor formation, improve the surface quality of drawing parts are Precision stainless steel sheet drawing technical problems lies.
2 solutions
Deep drawing steel sheet bonding occurs during tumor has been plagued by production site, a great deal of trouble to producers, but due to the bonding neoplasia and other issues related to tribology, influenced by many factors. Currently, we can only propose measures from different angles to prevent tumor formation and reduce adhesion.
2.1 working part mold material selection and heat treatment
For bond tumor problem, choose a stainless steel 430ba mold material Chak relations, two points should be combined according to the pro stainless steel sheet metal and mold material: Choose one anti-adhesion strength, and second mold material wear and friction reduction. In general, the metal lattice type, lattice pitch, electron density, electrochemical properties interlinked metal, which attract each other, dissolving ability, easy to adhere together, the results of the friction coefficient becomes large. Cr, Ni and Fe miscibility big, so when using steel deep drawing, bonding tumors more susceptible to the phenomenon. Practice has proved that: use aluminum bronze, aluminum bronze hard sticking better; using Steel bonded tungsten carbide manufacturing die than raise with Cr12Mov tufftride manufacturing die life several times, and non-stick mode; if using code 3054 alloy cast iron, just mold surface flame hardening, the mold surface does not appear bond tumor. Also in vulnerable parts of the mold can be used carbide inserts, it has excellent compression performance, superior wear resistance and long-lasting love of the surface roughness and dimensional control. However, due to the price, the production used less.
Surface processing mold work portion 2.2
Stainless steel drawing die surface quality requirements are high. Low surface roughness may serve to improve the anti-friction and anti-adhesion effect so. After drawing die during the grinding process, the more important is to eliminate machining marks. In the mold is often overlooked grinding and polishing processes. It should be noted. Throughout the mold process, polishing workload should account for one third, because the appearance of quality stainless steel products depends largely on the mold polishing techniques. Reduce mold surface roughness, a corresponding reduction in the number of grinding mold, mold life correspondingly improved.
If the mold surface polishing enough, coupled with deep drawing steel sheet bonded easily cause tumor characteristics, thus drawing out of the product scratches serious. And that the scratches on the product with polished to solve time-consuming and reach results. Therefore, we should step up and down in the mold polishing great effort, only the mold surface machining accuracy is improved in order to reduce scratches, mold repair mold life can be greatly improved. In recent years, there have been a variety of new techniques of polishing and polishing tools, the development of ultrasound, electrolytic polishing, abrasive blasting, honing extrusion and other new technology, new equipment. According to information on CrWMo, 3Cr12W8V, Cr12 mold test three materials studied electrochemical polishing, polishing prove that only 5-10 minutes from the mold cavity surface roughness of the original Ra3.2-Ra1.6 down to Ra0.4-RaO.2 basis. While by electrochemical polishing may improve the surface hardness to improve wear resistance. Again, ultrasonic polishing machine can be used by soft nitriding treatment cavity fine polishing, it is easy to avoid the disadvantages of manual polishing damage nitride film. For new polishing techniques we should take active steps to use and summary.
Stainless steel drawing die surface quality requirements are high. Low surface roughness may serve to improve the anti-friction and anti-adhesion effect so. After drawing die during the grinding process, the more important is to eliminate machining marks. In the mold is often overlooked grinding and polishing processes. It should be noted. Throughout the mold process, polishing workload should account for one third, because the appearance of quality stainless steel products depends largely on the mold polishing techniques. Reduce mold surface roughness, a corresponding reduction in the number of grinding mold, mold life correspondingly improved.
If the mold surface polishing enough, coupled with deep drawing steel sheet bonded easily cause tumor characteristics, thus drawing out of the product scratches serious. And that the scratches on the product with polished to solve time-consuming and reach results. Therefore, we should step up and down in the mold polishing great effort, only the mold surface machining accuracy is improved in order to reduce scratches, mold repair mold life can be greatly improved. In recent years, there have been a variety of new techniques of polishing and polishing tools, the development of ultrasound, electrolytic polishing, abrasive blasting, honing extrusion and other new technology, new equipment. According to information on CrWMo, 3Cr12W8V, Cr12 mold test three materials studied electrochemical polishing, polishing prove that only 5-10 minutes from the mold cavity surface roughness of the original Ra3.2-Ra1.6 down to Ra0.4-RaO.2 basis. While by electrochemical polishing may improve the surface hardness to improve wear resistance. Again, ultrasonic polishing machine can be used by soft nitriding treatment cavity fine polishing, it is easy to avoid the disadvantages of manual polishing damage nitride film. For new polishing techniques we should take active steps to use and summary.
2014年11月21日星期五
describes the general characteristics of stainless steel sheets
stainless steel sheets of stainless steel in order to make better the performance of traditional applications, has been the improvement of existing types, and, in order to meet the stringent requirements of advanced architectural applications, is the development of new grade 430 stainless steel. stainless steel sheets to the continuous improvement of production efficiency, quality, continuous improvement, stainless steel has become one of the most cost-effective materials architects choice. stainless steel sheets set performance, appearance and use of features in one, so the stainless steel will continue to be one of the best materials in the world.
stainless steel sheets can withstand the requirements of oxalic acid, sulfuric acid - ferric sulfate, nitrate, nitric acid - hydrofluoric acid, sulfuric acid - copper sulfate, phosphoric acid, formic acid, acetic acid and other corrosive, widely used in chemical, stainless steel plate food, pharmaceutical, paper, oil , atomic energy and other industries, as well as construction, kitchen utensils, cutlery, vehicles, household appliances, all kinds of parts.
2014年11月17日星期一
The use of performance stainless steel sheet
stainless steel sheet for the development of high quality, high performance, low cost, ultra-pure ferritic stainless steel to provide adequate theoretical basis, create considerable market and economic value.
stainless steel sheet nitrogen content is very low, compared with ordinary ferritic stainless steel has superior corrosion resistance, stainless steel sheet toughness and weldability, nearly half a century has been the strong development and wide application. In the 21st century, put forward the strategy of sustainable development, so that the development of new materials must be environmentally friendly as a prerequisite.
stainless steel sheet surface is etched with patterns, stainless steel sheet suppliers but also for drawing so as to meet the various requirements of the designer appearance. Surface state is easy to maintain. Just the occasional rinse can remove dust. Because of good corrosion resistance, graffiti can be easily removed contaminated surfaces or other similar surface contamination.
2014年11月13日星期四
430 stainless steel sheets using technology
430 stainless steel sheets to explore environmental management, technology development and business entity with its own characteristics for one model of development of environmental protection industry, metallurgical industry's first built a national circular economy stainless steel sheets industrial park, the implementation of a number of energy saving technology industrialization projects, R & D reserve dozens of applications available to promote the industrialization of energy-saving and environmental protection technology and equipment, expanding its social Stainless steel sheet metal and environmental markets.
With the use of high-speed, automated, large-tonnage extruder, and the development of glass lubricants, non-oxidizing heating, high strength and toughness of hot work die, and other related technologies produced by hot extrusion 430 stainless steel sheets, stainless steel factory in particular, production difficult deformed 430 stainless steel sheets, high-alloy steel pipe has been rapid development. With a single two-roll rotary piercing mother pipe material for cold provide a method has basically not adopted abroad.
2014年11月9日星期日
stainless steel sheets of Recycling
In recycling, the steel for the relocation of the most important items --- Steel Plant "bright spots" Strobe: the plant entirely according to the circular economy concept design in the construction process, in order to "reduce, reuse, recycle" principle, low consumption, stainless steel sheets low emission, high efficiency characteristics. The coke oven gas generated in the production process, blast furnace gas, converter gas all the recycling, except for the coke ovens, iron stove, steel sleeve lime kilns, steel rolling production, surplus gas is used for power generation all .
In order to stainless steel sheet metal improve the yield stainless steel sheets, domestic improve production processes, different products with different sizes of stainless steel pipe production process: small size stainless steel sheets of solid billet stainless steel plate piercing directly on the vertical puncher; medium size as small as possible drill pipe billet hole, and then reaming in a vertical piercing mill; stainless steel sheets to be blank after drilling larger holes, directly into the extruder into a pipe.
2014年11月5日星期三
Appearance performance stainless steel sheet of instructions
Stainless steel mesh editing informed stainless steel pump driven by the stainless steel industry, with good market prospects, not only the civilian stainless steel pumps, stainless steel or industrial areas of demand of industrial pumps. stainless steel sheet is expected of stainless steel sheet market in the last ten years, up to 3 billion.
In real life, most people think that stainless steel is not magnetic, and with the magnet to identify stainless steel, this method is very scientific. First of zinc alloy, copper alloy can generally be simulated stainless steel sheet of exterior colors, nor magnetic, easily mistaken for Stainless steel strips ; and even the 304 steel grades we are currently the most commonly used, after cold working, there will be varying degrees of magnetic properties. It is not just by a magnet to determine the authenticity of stainless steel.
2014年11月1日星期六
430 stainless steel sheets performance presentation
430 stainless steel sheets are made of high quality stainless steel wire row welding, stainless steel crimped wire mesh is made of pre-bent into a wave-shaped stainless steel wire with plain weave together in pieces, stainless steel filter mesh stainless steel sheet is cut, 430 stainless steel sheets cut sheet into a round, square, rectangular and other shapes. They have 430 stainless steel sheets, high temperature, acid, alkali, corrosion resistance, abrasion characteristics. It uses three types of mesh are not the same, the first two categories are generally used for load-bearing, protection, fencing, decorative and other purposes, 430、304 stainless steel sheets filter sheets are generally used for acid-base environment screening and filtration.
430 stainless steel sheets can be widely used in mining, sand stone, coal screening and construction, civil, farming and other sectors of isolation and protection. One stainless steel crimped wire mesh can be used for acid, stainless steelp late suppliers alkali harsh environment in petroleum, chemical, marine and other industries filtering, screening and prevention, making continuous glass reinforcement, various industrial baskets, crafts, kitchen, refrigerator storage the basket.
2014年10月28日星期二
Excellent performance of stainless steel sheets
Excellent performance of stainless steel sheets determines the material is widely used and high-rise buildings, advertising display, bridge structure, internal and external decoration, Stainless Steel Sheets and crafts and so on, can also through some mechanical processing and manufacturing of parts and the production of a variety of household electrical appliances and daily necessities. Stainless steel sheets, stainless steel sheet metal especially the use of the material design of large buildings, decorative building will generate from the static to dynamic changes.
Because stainless steel sheets containing chromium and chromium to form on the surface of a very thin membrane, Stainless steel strips the membrane separates the invasion and steel in oxygen corrosion effect. In order to maintain the inherent in stainless steel corrosion resistance steel must contain a minimum of 12% chromium.
Because stainless steel sheets containing chromium and chromium to form on the surface of a very thin membrane, Stainless steel strips the membrane separates the invasion and steel in oxygen corrosion effect. In order to maintain the inherent in stainless steel corrosion resistance steel must contain a minimum of 12% chromium.
2014年10月23日星期四
Overview of stainless steel sheet
When stainless steel sheet just life, shows its excellent performance and great charm, preserving the characteristics of metal stainless steel case, showing the beautiful colors, gentle and elegant. stainless steel sheet external color will not be because of long time irradiation by ultraviolet ray will fade. Even in more hostile environments, this film will not be damaged.
Stainless steel sheet has not rust, stainless steel sheet metal and acid resistance (corrosion resistance). Stainless steel stainless steel and corrosion resistance is due to its surface chromium rich oxide film (the formation of the passivation film). This stainless steel and corrosion resistance is relative. Test shows that the steel in atmosphere, water and the weak medium and nitric acid oxidation medium, stainless steel sheet, stainless steelp late suppliers the corrosion resistance increased with the increase of chromium content in the steel increases, when the chromium content reaches a certain percentage, steel corrosion resistance mutations, namely from the rust to is not easy to rust corrosion, never to corrosion resistance.
2014年10月1日星期三
430 stainless steel sheets products
430 stainless steel sheets refers to the resistance of air, steam, water and other corrosive medium and weak acid, alkali, salt and other chemical etching medium corrosion of 430 stainless steel sheets , also known as stainless acid resisting steel. In practical application, often weak corrosion resistant steel known as stainless steel, the corrosion of steel called acid resistant steel. Because of the stainless steel factory in the chemical composition, the former not resistant to chemical corrosion, while the latter generally has not rust. Alloy elements in stainless steel corrosion resistance depends on the contained in.
430 stainless steel sheets often organized by the state is divided into: martensitic steel, ferritic steel, stainless steel sheets steel etc.. In addition, according to the component as the chromium stainless steel, chrome nickel stainless steel and chromium manganese nitrogen stainless steel etc.
2014年9月25日星期四
Stainless steel sheets production system
Stainless steel sheets established energy-saving emission reduction responsibility system, by strengthening the process control, strengthen energy management, increase the supervision and management of emission reduction, the development potential of the Stainless steel strips activities, accumulated energy saving 178000 tons of standard coal, surpassed the provincial government issued a plan total energy saving 175100 tons of standard coal target. In order to meet the provincial environmental capacity, in recent years, adjust the development strategy, no expansion of production capacity but increase the intensity of structural adjustment, by the production of ordinary steel to steel, improve the added value of products, and in turn means to accelerate efforts to increase energy-saving emission reduction. Stainless steel sheets the total investment amount reached stainless steel sheets . They also at the signing of energy-saving emission reduction responsibility form, the implementation of energy-saving emission reduction vote, not complete in energy conservation and emission reduction targets the responsibility of units and the main leadership not to participate in various forms of year-end awards. At present, fresh water consumption per ton steel 3.36 tons, much lower than the average level of 5.09 tons in the industry, Stainless steel sheet metal indicators in environmental protection, energy consumption, comprehensive utilization of resources, etc., has reached the domestic advanced level in the same industry.
2014年9月17日星期三
Stainless steel sheet material are introduced
Stainless steel sheet has reached the highest level in the world is close to the global total consumption per capita 1/4, stainless steel consumption reached 3.4KG, leapt to the forefront of the developing countries. Stainless steel sheet has the advantages of stainless steel sheet metal resistance, high strength, lightweight, long service life and other excellent characteristics. In recent years, stainless steel pumps are widely used in shipbuilding, rail vehicle transportation, with the development of machine manufacturing industry, stainless steel pumps will have broader application prospect. But the consumption growth rate gradually stainless steel down, by the consumption of average annual growth rate of more than 30% of the ultra high speed development stage, into the current growth rate of the steady development of stage 6.43%.
Stainless steel itself because of its corrosion resistance, high temperature resistance, wear resistance and other properties, in our country focus on the development of energy, petrochemical, electric power, stainless steel magnetic and other fields will be more actively play its role. Now, the stainless steel pump in areas is increasing, which in the water industry, construction and structure of industry, environmental protection industry, industrial facilities in the demand will increase year by year.
2014年9月12日星期五
Market consumption trends of 430 stainless steel sheets
430 stainless steel sheets industry "barometer" of the domestic steel prices index released in Hebei Tangshan, including state-owned enterprises and famous private enterprises and other industry 430 stainless steel sheets to witness the publishing process, the steel price index for 3050 yuan.
Stainless steel net report "world steel Chinese, while the steel price depends on the steel price index." Chinese steel industry information director in the billet prices index said. With the 430 stainless steel sheets industry marketization, internationalization and pan gold melting process, the steel market is becoming increasingly fierce, foreign institutions have introduced various types of steel index, while in China there is no a stainless steel sheet metal index is generally accepted.
Stainless steel net reported that, according to the market and the actual situation is extremely inconsistent, China steel industry network, after several years of exploration and research, the information platform, the data collection, analysis, integration, the final processing based on Web database, showing a real industry data, and provide reliable reference for iron and steel enterprise.
Stainless steel net reported "billet is obtained by casting steel smelting stainless steel factory to make products, great impact on steel prices. At present, foreign ore Chinese 430 stainless steel sheets industry dependency has more than 50%, but the domestic iron and steel enterprises in accordance with the foreign steel index guiding operation and avoid risks facing many uncertain factors, also can cause great hidden trouble for China the entire steel industry security. Timely stainless steelp late suppliers of billet prices index, will improve the reference of the steel business, is of great significance to the standardization of operation market."
2014年9月8日星期一
Academic and application analysis of stainless steel sheets
This research is of great academic and application value, at the international advanced level. Research on the subject, not only can get the valid research results in scientific research, and the stainless steel sheets can provide theoretical basis for the development of high-quality, high performance, low cost ultra pure stainless steel sheets , creating considerable market and economic value.
Stainless steel sheets ultra pure ferritic stainless steel with low carbon, nitrogen content, compared with ordinary ferritic stainless steel has better corrosion resistance, toughness and weldability, nearly half a century has obtained great development and wide application of. Since twenty-first Century, the strategy of sustainable development, the 430、304 stainless steel sheets of new materials to be friendly to the environment as a prerequisite. And ultra pure ferritic stainless steel is resource saving environment-friendly materials ideal, it does not contain the metal hypersensitivity to nickel on the human body, in the iron exhaust system of stainless steel and is especially good corrosion resistance of Nb ferritic stainless steel, making it a good substitute for cast iron material.
An alloying element stainless steel sheets production, plays an important role on ultra pure ferritic stainless steel organizational performance and quality. Through the study on a series of super pure quality and properties of stainless steel continuous casting billet, and determine the niobium, titanium in ultra pure ferritic stainless steel in the occurrence and limit the content, and the best proportion of niobium, titanium, carbon, nitrogen, can provide effective solutions to the slab quality and process optimization of the surface the ferritic stainless steel production process.
2014年9月4日星期四
Chemical composition of stainless steel sheet introduction
Acid resistant stainless steel is called stainless steel sheet, which is composed of two parts, stainless and acid resistant 430 stainless steel sheets , in a nutshell, atmospheric corrosion resistant steel is called stainless steel sheet, and resistance to chemical corrosion of steel called acid resistant steel. Generally speaking, with Ge content greater than 12% steel with stainless steel stainless steel sheet according to the microstructure after heat treatment can be divided into five categories: ferrite stainless steel sheets , martensitic stainless steel, austenitic stainless steel, Austenitic - ferritic stainless steel and precipitation of carbide stainless steel.
Because stainless steel sheet has excellent corrosion resistance, formability, compatibility and in a wide temperature range, strong stainless steelp late suppliers series features, so obtained wide application in heavy industry, light industry, household goods industry and construction industry.
2014年8月31日星期日
Stainless steel sheets in the market development and
Stainless steel sheets in the construction steel market, the price decline was relatively large, stainless steel sheets , Nanchang, Changsha, quite a number of market price decline of 110 tons to 190 yuan. After the Lantern Festival, many businesses reflect poor delivery, the market turnover in the doldrums trend has not changed. Social inventory increased significantly, to bring certain psychological pressure to the merchant. Have to remind people, it is important to note that, after the rapid stainless steel sheet metal for more than a week, the construction steel market price cost price already approached, the next step will be to previous business price reduced. 321 stainless steel plate representative manufacturers a new round of ex factory price launched the "flat", coupled with the weather warming, construction site will be gradually increased, the demand will improve.
The stainless steel mesh editing relevant mechanism analysis that in mid February, the national average crude steel production exceeded 2000000 tons, this is the first time since October last year. One is the steel production and inventory Stainless Steel Sheets simultaneously; the downstream demand on the other hand, the steel industry is still not optimistic. In the background of steel overcapacity, even if macroeconomic warmer, is not enough to improve the iron and steel industry from the fundamental operations. Estimation of steel, or by weak consolidation pattern.
2014年8月27日星期三
A report on stainless steel sheet
Stainless steel sheet recently, completed by TISCO postdoctoral workstation of niobium, titanium "of" 430 stainless steel sheets quality and properties of stainless steel continuous casting billet topic through the review. Evaluation expert thinks, this research is of great academic and application value, at the international advanced level. Research on the subject, not only can get the valid research results in scientific research, and can provide theoretical basis for the development of high-quality, high performance, low cost ultra pure ferritic stainless steel sheet, creating stainless steelp late suppliers market and economic value.
Stainless steel sheet ultra pure ferritic stainless steel with low carbon, nitrogen content, compared with ordinary ferritic stainless steel has better corrosion resistance, toughness and weldability, nearly half a century has obtained great stainless steel sheets and wide application of. Since twenty-first Century, the strategy of sustainable development, the development of new materials to be friendly to the environment as a prerequisite.
2014年8月23日星期六
Development trend of 430 stainless steel sheets
430 stainless steel sheets, the second week of trading after the Spring Festival, because the terminal demand has not yet released significantly, steel output high, steel social inventory stainless steel sheets rapidly, coupled with the steel futures prices continue for several days running vulnerable spot steel city, confidence be affected, generally fall the main varieties of steel spot prices, sign until the weekend the decline was slightly slower.
430 stainless steel sheets was informed that according to the analysis, in the plate market, weak still. 430 stainless steel sheets the price to drop continuously, a regional decline obviously, per ton fell 80 yuan. Transactions in the market overall poor, market 430 stainless steel sheets is pessimistic, even if prices fall, the lower reaches of the purchase enthusiasm is not high. After 430 stainless steel sheets price all the way down, or narrowing. People in the market to reflect, supporting force of steel city, always lets the human feel that final demand is not enough, coupled with the Spring Festival stainless steel plate stock market increase, on spot and part of greater financial businesses, began to jettison the cash.
2014年8月19日星期二
Stainless steel sheets properties and uses
This new product is stainless steel sheets revolution, is worldwide the only exclusive invention, can help Stainless Steel Sheets to reduce the cost of raw materials, maintaining the traditional stainless steel sheets excellent anti rust performance, the low carbon steel intermediate to improve the machining performance of products, have absolutely competitive products and price formation. This product is the 430 stainless steel suppliers of products stainless steel sheets update. Stainless steel sheets products, do not need chemical plating, so it can effectively protect the environment, in line with the state of the production of iron and steel industry guidelines and national requirements for the construction of a conservation minded society. The new composite materials, stainless steel sheet metal the new direction of development of cold rolled stainless steel sheet products, so that enterprises in the fierce competition to win. Support of new technology products, can help the stainless steel enterprises to find new business opportunities.
2014年8月16日星期六
Knowledge of stainless steel sheet introduction
Stainless steel sheet sample surface and corrosion resistant performance is good, do not have to go through 430 stainless steel sheet treatment such as plating color, and play the stainless steel inherent surface properties, a used in many aspects of steel, often called stainless steel. Represent properties of chrome steel, nickel chromium steel and high alloy steel. Stainless steel sheet is a universal stainless steel materials, anti rust performance than the stainless steel material. High-temperature is better, can high to 1000-1200 degrees. Stainless steel sheet has excellent stainless corrosion resistant performance, corrosion resistance and good resistance to magnetic stainless steel sheets . The oxidizing acid, derived from the experimental concentration ≤ 65% boiling temperature below the nitric acid, stainless steel sheet has strong corrosion resistance. Also has good corrosion resistance to alkali solution and most organic and Stainless Steel Sheets acid. Mechanism of stainless steel sheet antirust alloy elements form dense oxide film, isolated oxygen exposure, prevent further oxidation. So so "does not rust".
2014年8月12日星期二
The 430 stainless steel sheets and material
Structure with 430 stainless steel sheets seamless steel pipe is widely used in chemical, petroleum, made of 430 stainless steel sheets hot-rolled textile, medical, food, machinery and other industrial anti-corrosion pipes and structural parts and components of (extrusion, expansion) and cold drawing (rolling) seamless steel tube.
430 stainless steel sheets is used for the transmission fluid made of magnetic stainless steel sheets hot-rolled (extrusion, expansion) and cold drawing (rolling) seamless steel tube.
430 stainless steel sheets is a general term for addition tube other than seamless pipe cross-section shape. According to the steel tube cross-section shape and size can be divided into different and wall thickness of seamless steel tube, unequal wall thickness of seamless steel tube, seamless steel tube diameter. Shaped seamless steel pipe is widely used for various stainless steel sheets parts, tools and machinery parts. Compared with the round pipe, special-shaped tubes are generally large inertia and section modulus, bending and torsional capacity is larger, can greatly reduce the structural weight, saving steel.
2014年8月8日星期五
Stainless steel sheets with internal 430 introduction
430 stainless steel sheets is the floorboard of stainless steel plate and acid resistant steel. 430 stainless steel sheets refers to the air resistance, steam and water, weak corrosion of steel, and acid resistant steel is resistant to acid, alkali, salt and other chemical etching medium corrosion of steel plate. Stainless steel plate since the 430 stainless steel sheets of this century has, up to now has 90 years of history. The invention of stainless steel plate was a great achievement in the world, the development of stainless steel plate and laid an important material and technological foundation for the development of modern industry and the progress of science and technology. Stainless steel plate for many, the performance of different, it is in the development process, gradually formed a few categories. According to the organizational structure is divided into stainless steel plate (including precipitation hardening stainless steel plate), stainless steel sheets , stainless steel plate and ferrite and ferrite dual phase stainless steel plate and other four categories? According to some characteristic elements of main chemical components or steel plate in the classification, divided into chromium stainless steel, chromium nickel stainless steel plate, nickel chromium molybdenum stainless steel plate and low carbon steel plate, stainless steel plate, high molybdenum high purity stainless steel plate etc.. According to the characteristics and application of classification of steel plates, divided into nitric acid resistant stainless steel plate, stainless steel plate, resistance to acid corrosion of stainless steel plate, the stress corrosion of stainless steel plate, stainless steel plate. According to the classification features of steel plate, stainless steel plate, divided into low temperature non magnetic stainless steel plate, stainless steel plate, superplastic free cutting stainless steel plate etc.. The classification is according to the characteristic of chemical composition structural characteristics and the steel plate and a combination of both. Generally divided into 430 stainless steel sheets, of stainless steelp late suppliers stainless steel plate, stainless steel, duplex stainless steel plate and precipitation hardening stainless steel plate? Or divided into chromium stainless steel and nickel stainless steel plate two categories. A wide range of uses? Equipment? Typical use: pulp and papermaking equipment heat exchanger, dyeing equipment, film processing equipment, pipeline, the coastal areas of the exterior of the building materials etc..
2014年8月4日星期一
The performance of stainless steel sheets
Uniform corrosion refers to the metal surface contact corrosion medium total corrosion phenomena. According to different demands of different indicators on corrosion, can generally be stainless steel sheet into two categories:
Stainless steel sheets refers to the corrosion in atmospheric and weak corrosive medium steel. The corrosion rate less than 0.01mm/ year, considered to be "completely corrosion; corrosion rate less than 0.1mm/ year", that is "resistance".
Corrosion resistant steel tube which can corrosion in various strong corrosive medium steel.
Point corrosion refers to the metal material surface most no corrosion or slight corrosion and local corrosion occurred in highly dispersed, common corrosion spot size of less than stainless steel sheet coil , depth is often greater than the surface of the aperture, the light has a shallow pit, serious and even the formation of perforation.
Crevice corrosion is a macro etch pits mottled or ulcer formation occurred in the metal component in the gap, which is a kind of local corrosion.
Stainless steel sheets intergranular corrosion is a selective corrosion, with the general difference is that selective corrosion, localized corrosion is a microscopic scale, and the macro is not necessarily local.
2014年7月28日星期一
Classification of stainless steel sheet
1, the stainless steel sheet mirror panel
Stainless steel sheet is also called the mirror plate, polishing liquid by polishing equipment polishing on stainless steel surface, the surface light like a mirror clear, then electroplating coloring.
2, the 430 stainless steel sheets drawing board
Pull plate, also called the hairline, because hair like slender and straight lines. The surface is Matt, look carefully with a little texture, but can not come out, than the general bright surface stainless steel wear, look more attractive to some. Plate has a variety of lines, a hairline, snow sand grain, and grain (fill), cross lines, cross lines, all the lines through the oil thrown hairline machine made according to the requirements of processing, and then electroplating coloring. 3, stainless steel sheet sand plate
3, stainless steel sheet sand plate
Sand plate with zirconium beads by magnetic stainless steel sheets equipment for processing in the stainless steel surface, make the surface appear slight bead granular sand surface, forming a unique decorative effect. Then electroplate
.4, stainless steel sheet combination technology board
According to the technological requirements, the hair lines, coating, polishing, sandblasting, etching process in the same piece of plate combination process. Then electroplate.
5, stainless steel sheet and plate
Both and pattern plate, or drawing board are frosted plate one, only the surface state board this in not the same, so that is not the same.
2014年7月23日星期三
Several state of 430 stainless steel of magnetic
430 stainless steel magnetic has the following kinds of state, state is not the same, dirt and corrosion resistance are not the same. NO.1, 2D, 2B, N0.4, HL, BA, Mirror, and various other surface treatment.
Surface processing 430 stainless steel magnetic feature processing technology
2D is a shiny silver white hot shot peening + annealing pickling + cold + annealing and pickling 2B is silver white and better than 2D surface gloss and flatness of hot rolling + annealing pickling + cold + shot peening annealing and pickling + temper rolling
No.3 has a 430 stainless steel plate gloss, coarse grain of 2D or 2B with 100~120 (JIS R6002) abrasive polishing and temper rolling
No.4 has a good gloss, fine lines on the 2D or 2B with 150~180 (JIS R6002) abrasive polishing and temper rolling
430 stainless steel magneticHL was abrasive material and hair gray stripes on 2D or 2B with the proper size of polishing the surface is continuous grinding grain
Surface processing 430 stainless steel magnetic feature processing technology
2D is a shiny silver white hot shot peening + annealing pickling + cold + annealing and pickling 2B is silver white and better than 2D surface gloss and flatness of hot rolling + annealing pickling + cold + shot peening annealing and pickling + temper rolling
No.4 has a good gloss, fine lines on the 2D or 2B with 150~180 (JIS R6002) abrasive polishing and temper rolling
430 stainless steel magneticHL was abrasive material and hair gray stripes on 2D or 2B with the proper size of polishing the surface is continuous grinding grain
2014年7月14日星期一
Ti stainless steel plate wherein a stabilizing element exists
stainless steel sheet in which 304 stainless steel coil as a stabilizing element exists, but it is also heat resistant steel, 304 stainless steel at high aspect ratio is much better .304 plate stainless steel plate at different concentrations and different temperatures of magnetic stainless steel sheets and inorganic acids, especially is a good abrasion properties in oxidizing medium, acid resistant container for the manufacture of equipment and wear lining pipelines.
2014年7月11日星期五
Corrosion of the stainless steel plate 430
All metals and oxygen in the reaction atmosphere, an oxide film is formed on the surface. Unfortunately, the iron oxide formed on carbon steel is continued oxidation, rust expanded, forming holes. You can use paint or oxidation-resistant metals (eg, zinc, nickel and chromium) plating to ensure the steel surface, but, as people know, this protection is only a film. If the protective layer is damaged, the following steel began to rust. 430 stainless steel sheets corrosion resistance depends on chromium, but because chromium is an integral stainless steel sheets of steel, so the protection methods vary. When you add the amount of chromium reached 10.5%, atmospheric corrosion resistant steel increased significantly, but higher chromium content, although still improve corrosion resistance, but not obvious. The reason is that when the steel with a chromium alloying treatment, the type of change has become similar to the surface oxide formed on the surface of magnetism stainless steel chromium oxide of the metal. Chromium-rich oxide protects the surface of this tightly adherent to prevent further oxidation. This oxide layer is very thin, it can be seen through the surface of the natural sheen of steel, so stainless steel has a unique surface. Moreover, if the damaged surface, and atmospheric reactions exposed steel surface will self-repair, re-formation of this "passive film", continue to play a protective role. Therefore, all of the stainless steel have a common characteristic, i.e., the chromium content of more than 10.5%.
2014年7月10日星期四
Features 430 stainless steel plate
430 stainless steel sheets containing sulfur and selenium cutting stainless steel, the main requirements for cutting and stainless steel sheet metal tables Guanghao occasions. 430 stainless steel to improve machinability and high temperature bonding properties. Suitable for automatic lathes. Bolts and nuts.
430 austenitic stainless steel is acid resistant stainless steel cutting, in order to improve the performance of the steel in the steel can be added to more than stainless steel coils manufacturers molybdenum, can be resistant to erosion, product good cutting resistance and burn. after the corrosion resistance and mechanical properties of stainless steel annealing .303 to stress, tensile strength 515MPa, yield 205MPa, elongation of 40%.
430 stainless steel is the full shape and size of a standard metal manufacturing
430 stainless steel sheets is the full shape and size of a standard metal manufacturing, and there are many special shapes. The most commonly used product is made of sheet and strip, and plate production with special products, for example, the production of hot-rolled structural steel and structural steel extrusion. And there are stainless steel 430ba oval, square, rectangular and hexagonal welded or seamless steel tubes and other forms of products, including profiles, rods, wire and castings. As discussed later, in order to meet the aesthetic requirements of architects, has developed a wide variety of commercial surface processing. For example, the surface can be coil stainless steel reflective or matte; may be glossy, polished or embossed; may be colored, the color of the plating or etching a pattern on the surface of stainless steel to meet the designer appearance various requirements. Surface state is easy to maintain. Just the occasional rinse can remove dust. Because of good corrosion resistance, graffiti can be easily removed or contaminated surfaces other similar surface contamination.
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