If the magnetic size increases, the stainless steel category can be subdivided as shown in the following figure.
Stainless steel category
The chromium content of austenitic stainless steel is between16 and 25%, and the nickel content is between 7% and 20%. The matrix is mainly austenitic structure, with face-centered cubic crystal structure and non-magnetic. It has good corrosion resistance and machinability.
Ferritic stainless steel matrix is mainly composed of ferrite structure with body-centered cubic crystal structure, which is magnetic and generally cannot be hardened by heat treatment. It has excellent chloride corrosion resistance, but it is sensitive to grain boundary corrosion and has poor low temperature ductility.
Martensite stainless steel matrix has martensite and magnetism, and its mechanical properties can be adjusted by heat treatment. High carbon content, high strength, hardness and wear resistance.
The matrix of duplex stainless steel has austenite and ferrite structure and is magnetic. The strength of duplex stainless steel is about twice that of conventional austenitic stainless steel or ferritic stainless steel, and it is suitable for thin-walled parts with strength requirements.
Precipitation hardening stainless steel matrix is austenite or martensite structure, which is hardened by precipitation. After solid solution, it is martensite or semi-austenite structure. It has higher strength and corrosion resistance than martensitic stainless steel.
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