Detailed analysis of standard fasteners

Now commonly used standard fasteners are nickel-plated, zinc-plated and stainless steel. What are the hardness of the three methods, which is most commonly used at the wiring terminals in mechanical instruments, and the fasteners are stainless steel, which is the specific stainless steel commonly used! The difference between 304 and 316 is there to do some detailed analysis and explanation!

304 is a versatile stainless steel, which is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability).

301 stainless steel exhibits obvious work hardening during deformation, and is used in various occasions requiring higher strength.

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

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

303 and 303Se are free-cutting stainless steels containing sulfur and selenium respectively. They are used in occasions where free cutting and high surface gloss are required. 303Se stainless steel is also used to make parts that require hot upsetting, because under such conditions, this stainless steel has good hot workability. (Guide: The prospect of fastener manufacturers in the industry is slim, explore the inner reasons)

304L is a variant of 304 stainless steel with lower carbon content, used in applications 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 is a nitrogen-containing stainless steel. Nitrogen is added to increase the strength of the steel.

305 and 384 stainless steels contain high nickel, and their work hardening rate is low. 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 oxidation resistance and creep strength of the steel at high temperatures. 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 particularly high resistance to carburization and thermal shock resistance.

316 and 317 stainless steel contain aluminum, so the resistance to pitting corrosion in marine and chemical industrial environments is much better than that of 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.

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