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 sheet low carbon content , heat treatment can enhance low intensity , weldability is poor, 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 430 stainless steel sheets 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.
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