304 is a kind of universal stainless steel, which is widely used in the production of equipment and parts requiring good comprehensive performance (corrosion resistance and formability).

301 stainless steel shows obvious work hardening phenomenon during deformation, which is used in various occasions requiring higher strength.

302 stainless steel is essentially a variety of 304 stainless steel with higher carbon content, which can obtain higher strength through cold rolling.

302B is a kind of stainless steel with high silicon content, which has high oxidation resistance at high temperature.

303 and 303se are free cutting stainless steels containing sulfur and selenium respectively, which are mainly used in the occasions requiring free cutting and high surface gloss. 303se stainless steel is also used to make hot upsetting parts, because it has good hot workability under such conditions.

304L is a variant of 304 stainless steel with low carbon content, which is used for welding. The low carbon content reduces the precipitation of carbides in the heat affected zone near the weld to the minimum, and the precipitation of carbides may lead to intergranular corrosion (welding erosion) of stainless steel in some environments.

304n is a kind of stainless steel containing nitrogen. The purpose of adding nitrogen is to improve the strength of the steel.

305 and 384 stainless steels contain high content of nickel and have low work hardening rate, which are suitable for various occasions with high requirements for cold formability.

308 stainless steel is used for welding rod.

The contents of Ni and Cr in 309, 310, 314 and 330 stainless steels are relatively high, in order to improve the oxidation resistance and creep strength at high temperature. However, 30s5 and 310S are variants of 309 and 310 stainless steels. The difference is that the carbon content is low, so as to minimize the carbide precipitation near the weld. 330 stainless steel has high carburizing resistance and thermal shock resistance

316 and 317 stainless steels contain aluminum, so their resistance to pitting corrosion in marine and chemical industrial environments is much better than 304 stainless steels. Among them, type 316 stainless steel includes low carbon stainless steel 316L, high strength stainless steel 316N containing nitrogen and free cutting stainless steel 316F with high sulfur content.

321, 347 and 348 are stainless steels stabilized with titanium, niobium plus tantalum and niobium respectively. They are suitable for welding components at high temperature. 348 is a kind of stainless steel suitable for nuclear power industry, which limits the amount of tantalum and drill.

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