1. Numbering and representation of steel
(1) Use the international chemical element symbol and the national symbol to represent the chemical composition, and use the Arabic alphabet to indicate the content of the ingredient: eg: China, Russia 12CrNi3A
(2) Use a fixed number of digits to indicate a steel series or number; for example: the United States, Japan, 300 series, 400 series, 200 series;
(3) The serial number is composed of Latin letters and sequences, indicating only the purpose.
2. China's numbering rules
(1) Using element symbols
(2) Use, Chinese Pinyin,
Flat furnace steel: P, boiling steel: F, killed steel: B, A steel: A, T8: special 8,
Coupling steel, spring steel, such as: 20CrMnTi60SiMn, (using a few ten thousandths to indicate C content)
Stainless steel, alloy tool steel (representing C content in parts per thousand), 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
3. 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 numbers in the 200 and 300 series.
(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 steel is marked with 430 and 446, martensitic stainless steel is marked with 410, 420 and 440C, and two-phase (austenitic-ferritic).
(4) Stainless steel, precipitation hardened stainless steel and high alloys containing less than 50% iron are usually named after patent names or trademarks.
4. Standard classification and classification
1 national standard GB
2 industry standard YB
3 local standards
4 enterprise standard Q/CB
1 product standard
2 packaging standards
3 method standard
4 basic standards
(3) Standard level (in three levels):
Y level: international advanced level
Level I: International general level
H level: domestic advanced level
(4) National standard
GB1220-84 stainless steel bar (I grade)
GB4241-84 stainless welded plate garden (H class)
GB4356-84 Stainless Welding Plate Garden (Class I)
GB1270-80 stainless steel pipe (Class I)
GB12771-91 stainless welded pipe (Y grade)
GB3280-84 stainless cold plate (Class I)
GB4237-84 stainless hot plate (Class I)
GB4239-91 stainless cold belt (Class I)
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