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.

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.

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.

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.

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.

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.

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.

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.