Precipitation hardening stainless steel sheets

Precipitation hardening stainless steel can be divided according to their organization martensitic precipitation hardening qiyi 304 stainless steel sheet ( as represented in 0Crl7Ni4Cu4Nb ) , semi-austenitic precipitation hardening stainless steel ( as represented in 0Crl7Ni7Al and 0Crl5Ni25Ti2MoVB ) plus ferritic and austenitic precipitation hardening stainless steel ( with PH55A , B, C as a representative ) . The use of such material after the aging heat treatment to precipitate Cu, Al, Ti, Nb , etc. to increase the strength of a metal compound material . The main features are:
1 , this type of stainless steel can be adjusted by means of the performance of the heat treatment process , so that the molding of the steel , the device manufacturing process is easy to process and easy forming tissue state . By semi-austenitic precipitation hardening stainless martensitic transformation and precipitation hardening austenitic , martensitic precipitation hardening qiyi stainless steel 304 by precipitation hardening treatment so as to have high strength and good toughness .
2 , chromium content of about 17% , plus contain nickel , molybdenum and other elements , therefore , in addition to having enough sex outside of stainless , corrosion resistance is close to 18-8 austenitic stainless steel.

stainless steel coils is a face-centered cubic structure of the main features are

1 , under normal heat treatment conditions of the steel matrix is austenite at different heating or improper heat treatment condition , there may exist a small amount of stainless steel coils and the carbides in the austenite matrix.

2 , heat treatment of austenitic stainless steel can not change its mechanical properties by cold deformation mode can be enhanced .

3 , by adding alloying elements molybdenum, copper , silicon and other ways to get the conditions of use for a variety of different kinds of steel such as 316L, 304Cu so on.

4 , non-magnetic , good low temperature performance , formability and weldability is an important characteristic of this type of steel grades .

Ferritic stainless steel

Ferritic stainless steel is a body-centered cubic structure , representing the steel is 409,430 , its corrosion resistance than austenitic stainless steel. The main features are:

1 , excellent resistance to stainless steel sheet coil cracking in austenitic stainless steel ;

2, with ferromagnetic at room temperature ;

3 , the heat treatment can not be cured , has excellent cold workability .

Low yield stainless steel sheets

12 to 30% chromium , 6 to 12% of nickel and small amounts of other elements. The carbon content of the steel is very low, at room temperature was added austenitic or ferritic organization . It has better corrosion resistance than chromium qiyi 430 stainless steel sheet , weldability and formability . The earliest chrome-nickel stainless steel made ​​in 1912 by the German E. B. Strauss and Mao Demirel . The most commonly used modern 18% chromium , 8% nickel, 18-8 stainless steel. This low yield strength steel , not heat strengthened . But working to strengthen the tendency of large , high-intensity obtained by cold wire and strip . Commonly used steel as 0Cr18Ni9, 0Cr17Ni13Mo2 , etc. , used for the production of chemical containers, equipment lining , pipelines , medical devices and instrumentation. Adding copper and molybdenum qiyi stainless steel 304 sheet , such as 0Cr18Ni18Mo2Cu2Ti better corrosion resistance in sulfuric acid, phosphoric acid, non-oxidizing medium.

430 stainless steel sheets corrosion-resistant steel

Chromium content of less than 12 % of the corrosion-resistant steel , acid-resistant stainless steel is short . Chromium steel corrosion medium and the role of oxygen in the steel surface to form a thin oxide film , called self- passivation film , the steel in the air, water and acid, alkali, salt is very resistant to corrosion. Other than chromium steel , qiyi stainless steel sheets nickel, molybdenum, copper , titanium and other alloy elements , it has better corrosion resistance , mechanical properties or the like process . Chromium stainless chromium content between 12 to 30 %. Was first made ​​in 1912 by the British H. Brearley . By organizational structures at room temperature, chromium stainless steel is divided into ferritic stainless and martensitic stainless steel categories. Ferritic stainless steel low carbon content , heat treatment can enhance low intensity , qiyi 430 stainless steel sheets  such as 0Cr13, 0Cr17Ni , mainly used for the production of nitric acid , synthetic fibers and food industry equipment. Carbon , total nitrogen content of 0.02 % or less of the ultra- pure ferritic stainless steel as 00Cr27Mo better corrosion resistance and process performance. Martensitic stainless steel high carbon content , after hardening heat treatment to get high strength and hardness, but poor corrosion resistance , such as 1Cr13, 4Cr13, 9Cr18MoV steel , used for the manufacture of turbine blades to withstand high loads , the bolt and high hardness of valves, tools and bearings.

Stainless steel sheets industry

After entering the 1990s, China's steel industry has entered a rapid development period, steel demand growth is much higher than the global level. Since 1990, global apparent consumption of qiyi stainless steel sheets with an average annual growth rate of 6%, while the 10-year period in the 1990s, the apparent consumption of stainless steel is 2.9 times the world average annual growth rate. In the 21st century, the rapid growth of China's steel industry.
According to "China's steel industry, Strategic Planning Market Outlook and Investment Analysis Report Preview" statistics, 2000 to 2006, China's steel consumption average annual growth rate of more than 21.17%. Which, in 2001, the apparent consumption of stainless steel reached 2.05 million tons, more than the United States as the world's first stainless steel consumer. In 2008, China's apparent consumption of steel reached 6.24 million tons, down 5.17 percent.
November 2011, China's steel production increased by 11.1% to 12.5 million tons. Production of stainless steel products 336,800 tons, qiyi 430 stainless steel sheet of 65.25%. Guangdong Province, which is the main production base of stainless steel products, the output reached 1.837 million tons, an increase of 41.76%, accounting for 78.62 percent of national output.