Identification method of stainless steel Number and representation method of steel:
1.Use international chemical element symbols and national symbols to indicate chemical composition, and use Arabic letters to indicate component content: such as: China, Russia 12CrNi3A
2.Use fixed-digit numbers to indicate steel Series or numbers; such as: the United States, Japan, 300 series, 400 series, 200 series;
3.Use Latin letters and sequences to form serial numbers, which only indicate usage. my country's numbering rules:
①Use element symbols
②Use, Pinyin, open hearth steel: P, boiling steel: F, killed steel: B, class A steel: A, T8: special 8, GCr15: ball combination steel, spring Steel, such as: 20CrMnTi 60SiMn, (in ten thousandths indicate C content) ◆Stainless steel, alloy tool steel (in thousandths indicate 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:
American Iron and Steel Institute uses three digits to mark various standard grades of malleable stainless steel. Among them:
① austenitic stainless steels are indicated by numbers of 200 and 300 series,
② ferritic and martensitic stainless steels are indicated by numbers of 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, duplex (austenite-ferrite)
④ stainless steel, precipitation hardening stainless steel and iron content less than 50% The high alloys are usually named after a patent or trademark.
4. Classification and classification of standards 4-1 classification:
① national standard GB ② industry standard YB ③ local standard ④ enterprise standard Q/CB
4-2 classification:
① product standard ② packaging standard ③ method standard ④ basic standard
4-3 standard Level (three levels):
Y level: international advanced level
I level: international general level
H level: domestic advanced level
4-4 National Standard
GB1220-84 Stainless Steel Bars (Class I)
GB4241-84 Stainless Steel Welded Discs (Class H)
GB4356-84 Stainless Welded Discs (Class I)
GB1270-80 Stainless Steel Pipes (Class I)
GB12771-91 Stainless Welded Pipe (Class Y)
GB3280-84 Stainless Cold Plate (Class I)
GB4237-84 Stainless Hot Plate (Class I)
GB4239-91 Stainless Cold Strip (Class I)
