①Use international chemical element symbols and national symbols to indicate chemical composition, and use Arabic letters to indicate component content: such as: China, Russia 12CrNi3A;
②Use fixed-digit numbers to indicate steel series or numbers; Such as: the United States, Japan, 300 series, 400 series, 200 series;
③ Use Latin letters and sequences to form serial numbers, only for purposes.
My country's numbering rules:
① Use element symbols;
② use, pinyin, open hearth steel: P, boiling steel: F, killed steel: B, class A steel: A, T8: special 8, GCr15: ball;
Spring steel, such as: 20CrMnTi60SiMn, (in ten thousandths of C content);
Stainless steel, alloy tool steel (in thousandths of C content), such as: 1Cr18Ni9 one thousandth (ie 0.1%C), no Rust C≤0.08%, such as 0Cr18Ni9, ultra-low carbon C≤0.03%, such as 0Cr17Ni13Mo.
International stainless steel marking method:
The American Iron and Steel Institute uses three digits to mark various standard grades of malleable stainless steel. Among them:
① austenitic stainless steel is indicated by numbers of 200 and 300 series;
② ferritic and martensitic stainless steels are indicated by numbers of 400 series. 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, martensitic stainless steels are marked with 410, 420 and 440C, and duplex stainless steels are marked with 430 and 446. (austenite-ferrite);
④Stainless steel, precipitation hardening stainless steel and iron content less than 50%.
