The origin of the ss plate number and identification method
1. Use international chemical element symbols and national symbols to represent chemical components, and Arabic letters to represent component content: such as China, Russia 12CrNi3A.
2. Use fixed-digit numbers to represent steel series or numbers; such as the United States, Japan, 300 series, 400 series, 200 series;
3. Use the Latin alphabet and sequence to form the serial number which only indicates the purpose.
Our country’s numbering rules:
1. Use element symbols.
2. Purpose, Hanyu Pinyin, open-hearth steel: P, boiling steel: F, killed steel: B, Class A steel: A, T8: special 8, GCr15: ball.
(1) Composite steel, spring steel, such as 20CrMnTi 60SiMn, (using a few ten thousandths to express the content of C).
(2) 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% such as 0Cr18Ni9, ultra-low carbon C ≤ 0.03% such as 0Cr17Ni13Mo
International Stainless Steel Labeling Method When consulting literature, the American Iron and Steel Institute uses three digits to label various standard grades of forgeable stainless steel. in:
1. Austenitic stainless steel is marked with 200 and 300 series numbers.
2. Ferritic and martensitic stainless steels 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.
3. Ferritic stainless steels are marked with 430 and 446, and martensitic stainless steels are marked with 410, 420, and 440C, and are duplex (austenite-ferrite).
4. Stainless steel, precipitation hardening stainless steel, and high alloys with iron content less than 50% are usually named by patent names or trademarks.