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Such as: China, Russia 12CrNi3A
2 Use a fixed number of digits to represent steel series or numbers; for example: the United States, Japan, 300 Series, 400 Series, 200 Series;
3 Use Latin letters and sequence numbers to indicate only the purpose.
China's numbering rule 1 uses element symbol 2 for purposes, Chinese pinyin, open hearth steel: P, boiling steel: F, killed steel: B, A steel: A, T8: special 8,
GCr15: ball â—† combined steel, spring steel, such as: 20CrMnTi 60SiMn, (in thousands of minutes to indicate C content)
◆ stainless steel, alloy tool steel (in parts per thousand for C content), such as: 1Cr18Ni9 one thousandth (ie 0.1% C), stainless steel 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 marked with 200 and 300 series numbers.
2 Ferritic and martensitic stainless steels are represented 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 steel is marked with 430 and 446. Martensitic stainless steel is marked with 410, 420, and 440C. It is a duplex (austenitic-ferritic).
4 Stainless steels, precipitation hardened stainless steels, and high alloys containing less than 50% iron are usually named after the patent name or trade mark.
4). Standard Classification and Classification 4-1 Classification:
1 National Standard GB
2 industry standard YB
3 Local Standard 4 Corporate Standard Q/CB
4-2 Category:
1 Product Standard 2 Packaging Standard 3 Method Standard 4 Basic Standard 4-3 Standard Level (3 levels):
Grade Y: International advanced level I: International general level H: Domestic advanced level 4-4 GB GB1220-84 Stainless steel (Grade I)
GB4241-84 Stainless Welding Disk Park (Grade H)
GB4356-84 Stainless Welding Disk Park (Class I)
GB1270-80 Stainless Steel Pipe (Class I)
GB12771-91 stainless steel welded pipe (Y grade)
GB3280-84 stainless cold plate (I level)
GB4237-84 Stainless Hot Plate (Class I)
GB4239-91 stainless cold band (I level)
Stainless steel identification method
Steel numbering and expression method 1 uses the chemical symbol of the international chemical element and the symbol of the country to indicate the chemical composition, and uses the Arabic alphabet to indicate the content of the ingredient: