Identification Method of Stainless Steel and Comparison of National Grades
1. Steel numbering and representation method
① Use international chemical element symbols and national symbols to represent chemical composition, and use Arabic letters to represent component content:
For example: China, Russia 12CrNi3A
② Use fixed digit numbers to represent steel series or numbers; For example, the United States, Japan, 300 series, 400 series, 200 series;
③ Use Latin letters and order to form a serial number, indicating only the purpose.
2. Numbering Rules in China
① Using element symbols
② Usage, Chinese Pinyin, Open Hearth Steel: P, Boiling Steel: F, Killed Steel: B, Class A Steel: A, T8: Special 8, GCr15: Ball
◆ Composite steel, spring steel, such as 20CrMnTi 60SiMn, (expressed as C content in parts per ten thousand)
◆ Stainless steel and alloy tool steel (expressed in thousandths as C content), such as 1Cr18Ni9 in thousandths (i.e. 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 indicate various standard grades of malleable stainless steel. Among them:
① Austenitic stainless steel is marked with numbers from the 200 and 300 series,
② Ferritic and martensitic stainless steels are represented by 400 series numbers. For example, some more common austenitic stainless steels are marked with 201, 304, 316, and 310,
③ Ferritic stainless steel is marked with 430 and 446, while martensitic stainless steel is marked with 410, 420, and 440C, with a dual phase (austenite ferrite),
④ Stainless steel, precipitation hardened stainless steel, and high alloys with an iron content of less than 50% are usually named under patent or trademark names.
4. Group standards for stainless steel
standard
GB
National Standards of the People's Republic of China (National Bureau of Technical Supervision)
KS
Korean Standard
AISI
American Iron and Steel Institute specifications
SAE
Society of Automotive Engineers
ASTM
American Society for Testing and Materials
AWS
American Welding Society Specification
ASME
American Society of Mechanical Engineers
BS
British Standard
DIN
German Standard Specification Deutsch Industria Normen
CAS
Canadian Standard Associationin
API
American Petroleum Institute Specification
① Use international chemical element symbols and national symbols to represent chemical composition, and use Arabic letters to represent component content:
For example: China, Russia 12CrNi3A
② Use fixed digit numbers to represent steel series or numbers; For example, the United States, Japan, 300 series, 400 series, 200 series;
③ Use Latin letters and order to form a serial number, indicating only the purpose.
2. Numbering Rules in China
① Using element symbols
② Usage, Chinese Pinyin, Open Hearth Steel: P, Boiling Steel: F, Killed Steel: B, Class A Steel: A, T8: Special 8, GCr15: Ball
◆ Composite steel, spring steel, such as 20CrMnTi 60SiMn, (expressed as C content in parts per ten thousand)
◆ Stainless steel and alloy tool steel (expressed in thousandths as C content), such as 1Cr18Ni9 in thousandths (i.e. 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 indicate various standard grades of malleable stainless steel. Among them:
① Austenitic stainless steel is marked with numbers from the 200 and 300 series,
② Ferritic and martensitic stainless steels are represented by 400 series numbers. For example, some more common austenitic stainless steels are marked with 201, 304, 316, and 310,
③ Ferritic stainless steel is marked with 430 and 446, while martensitic stainless steel is marked with 410, 420, and 440C, with a dual phase (austenite ferrite),
④ Stainless steel, precipitation hardened stainless steel, and high alloys with an iron content of less than 50% are usually named under patent or trademark names.
4. Group standards for stainless steel
standard
GB
National Standards of the People's Republic of China (National Bureau of Technical Supervision)
KS
Korean Standard
AISI
American Iron and Steel Institute specifications
SAE
Society of Automotive Engineers
ASTM
American Society for Testing and Materials
AWS
American Welding Society Specification
ASME
American Society of Mechanical Engineers
BS
British Standard
DIN
German Standard Specification Deutsch Industria Normen
CAS
Canadian Standard Associationin
API
American Petroleum Institute Specification
