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Extended data:
International stainless steel marking method:
The American Iron and Steel Association uses three numbers to represent various standard grades of malleable stainless steel. These include:
① Austenitic stainless steel is marked with serial numbers of 200 and 300. For example, some common austenitic stainless steels are marked with numbers of 20 1, 304, 3 16 and 3 10.
② Ferritic and martensitic stainless steels are represented by 400 series numbers.
③ ferritic stainless steel is marked with 430 and 446, and martensitic stainless steel is marked with 4 10, 420 and 440C.
④ Duplex (austenite-ferrite), stainless steel, precipitation hardening stainless steel and high alloy with iron content less than 50% are usually named by patent names or trademarks.
Classification and grading 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 grades (divided into three grades):
Y: international advanced level I: international general level H: domestic advanced level.
References:
Stainless steel-Baidu encyclopedia