301: Good ductility, used for molded products. It can also be hardened at machine speed. Good weldability. Abrasion resistance and fatigue strength are better than 304 stainless steel.
302: Corrosion resistance is the same as 304, and the strength is better due to the relatively high carbon content.
302B: It is a kind of stainless steel with high silicon content, which has high resistance to high temperature oxidation.
303: By adding a small amount of sulfur and phosphorus to make it more shaved.
303Se: It is also used to make parts that require hot upsetting, because under such conditions, this stainless steel has good hot workability.
304: 18/8 stainless steel. GB brand is 0Cr18Ni9. 309: It has better temperature resistance than 304.
304L: It is a variant of 304 stainless steel with lower carbon content, used in occasions where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause stainless steel to produce intergranular corrosion (welding erosion) in certain environments.
304N: It is a nitrogen-containing stainless steel. Nitrogen is added to increase the strength of the steel.
305 and 384: Containing higher nickel, its work hardening rate is low, suitable for various occasions requiring high cold formability.
308: Used to make welding rods.
309, 310, 314 and 330: The content of nickel and chromium is relatively high, in order to improve the oxidation resistance and creep strength of steel at high temperature. While 30S5 and 310S are variants of 309 and 310 stainless steel, the difference is that the carbon content is lower in order to minimize the carbides precipitated near the weld. 330 stainless steel has a particularly high resistance to carburization and thermal shock resistance.
316 and 317: Contain aluminum, so the resistance to pitting corrosion in marine and chemical industrial environments is much better than 304 stainless steel. Among them, the 316 stainless steel variants include low-carbon stainless steel 316L, nitrogen-containing high-strength stainless steel 316N, and free-cutting stainless steel 316F with higher sulfur content.
321, 347 and 348: are stainless steel stabilized with titanium, niobium plus tantalum, and niobium respectively, suitable for welding components used at high temperatures. 348 is a kind of stainless steel suitable for the nuclear power industry and has certain restrictions on the combined amount of tantalum and drill.
