Common stainless steel models
Commonly used stainless steel models commonly used numerical symbols, there are 200 series, 300 series, 400 series, they are the United States of America's representation, such as 201, 202, 302, 303, 304, 316, 410, 420, 430, etc., China's stainless steel models are used in the element symbols plus numbers, such as 1Cr18Ni9, 0Cr18Ni9, 0Cr17, 3Cr13, 1Cr17Mn6Ni5N, etc., and numbers indicate the corresponding element content. 00Cr18Ni9, 1Cr17, 3Cr13, 1Cr17Mn6Ni5N and so on, the number indicates the corresponding element content.
200 series: chromium-nickel-manganese austenitic stainless steel
300 series: chromium-nickel austenitic stainless steel
301: Good ductility, used for molded products. Can also be hardened by machine speed. Good weldability. Wear resistance and fatigue strength is better than 304 stainless steel.
302: corrosion resistance with 304, due to the relatively high carbon content and therefore better strength.
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 machinable.
303Se: It is also used to make machine parts that require hot heading, because this stainless steel has good hot workability under these conditions.
304: 18/8 stainless steel. GB grade 0Cr18Ni9. 309: better temperature resistance than 304.
304L: A variant of 304 stainless steel with a lower carbon content, used where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, which can lead to intergranular corrosion (weld erosion) of the stainless steel in some environments.
304N: A stainless steel containing nitrogen, which is added to increase the strength of the steel.
305 and 384: Containing high levels of nickel, they have a low work-hardening rate and are suitable for a wide range of applications requiring high cold formability.
308: Used to make welding rods.
309, 310, 314 and 330: nickel and chromium content are relatively high, in order to improve the oxidation resistance of steel at high temperatures and creep strength. While 30S5 and 310S are variants of 309 and 310 stainless steel, the difference is that the carbon content is lower, so that the carbides precipitated near the weld are minimized. 330 stainless steel has a particularly high resistance to carburization and resistance to heat shock.
316 and 317: contain aluminum, and thus have a much better resistance to pitting corrosion in marine and chemical industry environments than 304 stainless steel. Among them, type 316 stainless steel by the variants include low-carbon stainless steel 316L, nitrogen-containing high-strength stainless steel 316N, as well as high sulfur content of the free-machining stainless steel 316F.
321, 347 and 348: are titanium, niobium plus tantalum, niobium stabilized stainless steel, suitable for use at high temperatures in the welded components. 348 is a kind of stainless steel suitable for the nuclear power industry, the tantalum and the amount of drilling combined with a certain degree of restriction.
400 series: ferritic and martensitic stainless steel
408: Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
409: the cheapest type (British and American), usually used as automobile exhaust pipes, is a ferritic stainless steel (chromium steel)
410: martensitic (high-strength chromium steel), good wear resistance, poor corrosion resistance. 416: added sulfur improves the machinability of the material.
420: "Cutting tool grade" martensitic steel, similar to Brinell high-chromium steel, the earliest stainless steel. Also used for surgical knives and can be made very bright.
430: Ferritic stainless steel, decorative, e.g. for car accessories. Good formability, but temperature resistance and corrosion resistance are inferior.
440: high-strength cutting edge steel, slightly higher carbon content, after appropriate heat treatment can obtain high yield strength, hardness can reach 58HRC, belong to the hardest stainless steel. The most common application example is "razor blades". There are three commonly used types: 440A, 440B, 440C, and 440F (easy-to-machine type).
500 Series: Heat-resistant chromium alloy steel
600 Series: Martensitic precipitation-hardening stainless steel
630: The most commonly used precipitation-hardening stainless steel type, often called 17-4; 17% Cr, 4% Ni.
Post time: Jun-13-2024
