① Use international chemical element symbols and national symbols to indicate chemical ingredients, and use Arabic letters to indicate ingredient content:

For example: China and Russia 12CrNi3A

② Use fixed-digit numbers to represent steel series or numbers; such as: United States, Japan, 300 series, 400 series, 200 series;

③ Use Latin letters and sequence to form serial numbers, which only indicate usage. ①Use element symbols

②Use, Chinese pinyin, open-hearth steel: P, boiling steel: F, killed steel: B, Class A steel: A, T8: Special 8,

◆Combined steel, spring steel, such as: 20CrMnTi 60SiMn, (C content expressed in thousandths)

◆Stainless steel, alloy tool steel (C content expressed in thousandths), such as: 1Cr18Ni9 Thousand One-third (ie

0.1%C), stainless C≤0.08% such as 0Cr18Ni9, ultra-low carbon C≤0.03% such as 0Cr17Ni13Mo The American Iron and Steel Institute uses three digits to indicate various standard grades Malleable stainless steel. Among them:

①Austenitic stainless steel is represented by numbers in the 200 and 300 series,

②Ferrite and martensitic stainless steel are represented by numbers in the 400 series. For example, some of the more common austenitic stainless steels

are marked with 201, 304, 316 and 310,

③ferritic stainless steels are marked with 430 and 446, Martensitic stainless steel is marked with 410, 420 and 440C

, dual phase (austenite-ferrite),

④ stainless steel, precipitation hardening stainless steel and iron-containing stainless steel High alloys with a content of less than 50% usually use patent names or trademark names