200 series - chromium-nickel-manganese austenitic stainless steel; 300 series - chromium-nickel austenitic stainless steel; model 301 - good ductility, used for forming products; model 302 - corrosion resistance is the same as 304, because the carbon content is relatively High factor; Model 303—Easier than 304 by adding a small amount of sulfur and phosphorus; Model 304—Universal model; i.e. 18/8 stainless steel; Model 309—Better temperature resistance than 304; Model 316—Following 304 After that, the second most widely used.
Stainless steel can be divided into chromium stainless steel, chromium-nickel stainless steel, chromium-manganese-nitrogen stainless steel, chromium-nickel-molybdenum stainless steel, ultra-low carbon stainless steel, high-molybdenum stainless steel, high-purity stainless steel, etc. according to the main chemical composition; Nitric acid (nitric acid grade) stainless steel, sulfuric acid-resistant stainless steel, pitting-resistant stainless steel, stress-resistant stainless steel, high-strength stainless steel, etc.
According to the functional characteristics of steel, such as low-temperature stainless steel, non-magnetic stainless steel, free-cutting stainless steel, superplastic stainless steel, etc. Usually classified by metallographic structure. According to the metallographic structure, it is classified into: ferritic (F) type stainless steel, martensitic (M) type stainless steel, austenitic (A) type stainless steel, austenitic-ferritic (A-F) type duplex stainless steel, Atenitic-martensitic (A-M) type duplex stainless steel and precipitation hardening (PH) type stainless steel.
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