Classification and use of stainless steel

The classification of stainless steel is very diverse, the main classifications are listed below:

First, according to the metallographic organization, it can be divided into five categories, namely austenitic stainless steel, martensitic stainless steel, ferritic stainless steel, duplex stainless steel and precipitation hardened stainless steel.

Second, according to chemical composition, it is mainly divided into chromium (400 series), chromium nickel (300 series) and chromium nickel manganese nitrogen (200 series, also known as manganese stainless steel), of which 400 can be divided into Steel types such as 430, 409L, 410, 410S, and 420; 300 series can also be divided into 304, 316L, 321, and 301; 200 series can also be divided into 201, 202, 205, J1, J2, J5, and the like.

Third, according to the functional classification of steel, it can be divided into low temperature stainless steel, heat resistant stainless steel, wear resistant stainless steel, non-magnetic stainless steel, free cutting stainless steel and superplastic stainless steel.