304It is a versatile stainless steel pipe, which is widely used to make equipment and parts requiring good comprehensive performance (corrosion resistance and formability).301 stainless steel shows obvious work hardening phenomenon during deformation, and is used in various occasions requiring higher strength.
302Stainless steel is essentially a variant of 304 stainless steel with higher carbon content, which can obtain higher strength by cold rolling.
302B is a stainless steel with high silicon content. It has high oxidation resistance at high temperature.
303303Se and 303Se are free-cutting stainless steels containing sulphur and selenium respectively. They are mainly used in situations requiring free-cutting and high gloss.303Se stainless steel is also used to make parts requiring hot upsetting, because this stainless steel has good hot workability under such conditions.
304L is a variant of 304 stainless steel with low carbon content. It is used for welding occasions.Lower carbon content minimizes the amount of carbides precipitated in the heat affected zone near the weld, and the precipitation of carbides may lead to intergranular corrosion (welding corrosion) of stainless steel in some environments.
304N is a nitrogen-containing stainless steel. Nitrogen is added to improve the strength of the steel.
305The 384 stainless steel contains high nickel, and its work hardening rate is low. It is suitable for various occasions with high requirements for cold formability.
308 Stainless steel is used to make welding rods.
309The contents of nickel and chromium in stainless steel 310, 314 and 330 are relatively high in order to improve the oxidation resistance and creep strength of the steel at high temperature.While 30S5 and 310S are variants of 309 and 310 stainless steels, the difference is only that the carbon content is low, in order to minimize the carbides precipitated near the weld.330 stainless steel has very high carburizing resistance and thermal shock resistance.
316Type 317 stainless steel contains aluminium, so its pitting corrosion resistance in marine and chemical environment is much better than 304 stainless steel.Among them, 316 stainless steel includes low carbon stainless steel 316L, high strength stainless steel 316N containing nitrogen and free cutting stainless steel 316F with high sulphur content.
321Titanium, niobium, tantalum and niobium stabilized stainless steel are suitable for high temperature welding.348 is a kind of stainless steel suitable for nuclear power industry, which limits the amount of tantalum and drill.