Stainless steel numbering principle

①Use international chemical element symbols and national symbols to represent chemical components, and use Arabic letters to represent component content: such as: China, Russia 12CrNi3A ②Use fixed digits to represent steel series or numbers; such as: United States, Japan, 300 Department, 400 series, 200 series; ③The serial number is composed of Latin alphabet and sequence, which only indicates the purpose. China’s numbering rules ① use element symbols ② use, Chinese pinyin, open hearth steel: P, boiling steel: F, killed steel: B, Class A steel: A, T8: special 8, GCr15: ball-bonded steel, spring steel, Such as: 20CrMnTi 60SiMn, (using a few ten thousandths to express the C content) stainless steel, alloy tool steel (using a few thousandths to express the C content), such as: 1Cr18Ni9 one thousandth (ie 0.1% C), stainless C ≤ 0.08% For example, 0Cr18Ni9, ultra-low carbon C≤0.03% 0Cr17Ni13Mo International Stainless Steel Marking Method The American Iron and Steel Institute uses three digits to mark various standard grades of forged stainless steel. (Guide: Duplex stainless steel and austenite and ferrite)

Among them: ①Austenitic stainless steel is indicated by 200 and 300 series numbers, ②Ferritic and martensitic stainless steel is indicated by 400 series numbers. For example, some of the more common austenitic stainless steels are marked with 201, 304, 316 and 310, ③ ferritic stainless steels are marked with 430 and 446, and martensitic stainless steels are marked with 410, 420 and 440C. Duplex (austenite-ferrite), ④Stainless steel, precipitation hardening stainless steel and high alloys with iron content less than 50% are usually named by patent names or trademarks.

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