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440C grade stainless steel is a kind of high carbon martensitic stainless steel. High strength, medium corrosion resistance, good hardness and wear resistance. Grade 440C achieves the highest strength, hardness and wear resistance of any stainless steel alloy after heat treatment. Its extremely high carbon content is the reason for these characteristics, which makes the 440C particularly suitable for applications such as ball bearings and valve parts.
444 stainless steel is a ferritic stainless steel, the national standard grade is 00 Cr18Mo2, its elements of ultra-low carbon nitrogen, chromium content of 18% and 2% molybdenum content, strong corrosion resistance. This type of stainless steel is usually stabilized by niobium or titanium, which can prevent intergranular corrosion after welding.
305 stainless steel is an austenitic chromium-nickel stainless steel with a low work hardening rate. This low work hardening rate makes it suitable for many deep drawing applications. In order to minimize the earrings during the drawing process, the directionality introduced during the cold rolling process must be kept to a minimum.
309 and 309S are austenitic chromium-nickel stainless steels that are typically used for higher temperature applications. Due to its high chromium and nickel content, 309 and 309S alloys have a high degree of corrosion resistance, excellent oxidation resistance and excellent heat resistance, while providing good strength at room temperature and high temperature. The only significant difference between 309 and 309S is the carbon content. The 309S alloy has less carbon, which minimizes carbide precipitation and improves weldability.
254SMO is a stainless steel originally used in seawater and other aggressive chloride environments. This grade includes a very high-end austenitic stainless steel; consisting primarily of 17.5 to 18.5 percent nickel, 19.5 and 20.5 percent chromium, 6 to 6.5 percent molybdenum, and. 18 to. 22 percent nitrogen. In this "super austenitic" chemistry, these specific levels of Cr, Ni, Mo and N give the 31254 impact toughness to resist cracking, pitting and crevice corrosion, and almost twice the strength of 300 series stainless steel.