301 is a versatile stainless steel that is widely used to make equipment and parts that require good comprehensive properties (corrosion resistance and formability). 301 stainless steel shows obvious work hardening phenomenon during deformation and is used in various occasions requiring higher strength.

302 stainless iron is essentially a variant of 304 stainless iron with a higher carbon content. It can obtain higher strength through cold rolling.

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

303 and 303Se are easy-cutting stainless irons containing sulfur and selenium respectively. They are used in situations where easy cutting and high surface brightness are mainly required. 303Se stainless iron is also used to make parts that require hot heading, because under such conditions, this stainless iron has good hot workability.

304L is a variant of 304 stainless steel with lower carbon content, used in situations where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone close to the weld, and the precipitation of carbides may cause intergranular corrosion (welding corrosion) of stainless iron in certain environments.

304N is a kind of stainless iron containing nitrogen. Nitrogen is added to improve the strength of the iron.

305 and 384 stainless steel contain high nickel and have low work hardening rate. They are suitable for various occasions that require high cold formability.

308 stainless steel is used to make welding rods.

309, 310, 314 and 330 stainless steel have relatively high nickel and chromium content in order to improve the iron's oxidation resistance and creep strength at high temperatures. 30S5 and 310S are variants of 309 and 310 stainless steel. The only difference is that the carbon content is lower to minimize the precipitation of carbides near the weld. 330 stainless steel has particularly high resistance to carburization and thermal shock resistance.

Types 316 and 317 stainless steel contain aluminum, so their resistance to pitting corrosion in marine and chemical industrial environments is much better than that of 304 stainless steel. Among them, the variants of type 316 stainless iron include low-carbon stainless iron 316L, nitrogen-containing high-strength stainless iron 316N, and easy-cutting stainless iron 316F with a high sulfur content.

321, 347 and 348 are stainless iron stabilized with titanium, niobium plus tantalum and niobium respectively, suitable for welding components used at high temperatures. 348 is a stainless steel suitable for the nuclear power industry and has certain restrictions on the combined amount of tantalum and cobalt.