304 stainless steel product standard International labeling method for stainless steel The American Iron and Steel Institute uses three digits to mark various standard grades of malleable stainless steel.Among them: ① Austenitic stainless steels are marked with numbers of 200 and 300 series. For example, some of the more common austenitic stainless steels are marked with 201, 304, 316 and 310. ② Ferrite and Martensite type stainless steel with 400 series of numbers. ③ Ferritic stainless steel is 430 and 446 as the mark, martensitic stainless steel is 410, 420 and 440C as the mark, ④ Biphasic (austenite-ferrite), stainless steel, precipitate-hardened stainless steel and high alloys with iron content less than 50% are usually named by patent or trademark. 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 standards ② packaging standards ③ method standards ④ basic standards 4-3 Standard level (divided into three levels):Y level: international advanced level I level: international general level H level: domestic advanced level 4-4 International Standard Stainless steel bar (grade I) GB4241-84 stainless steel welding plate garden (grade H) Stainless steel welded plate garden (Grade I) GB1270-80 stainless steel pipe (Grade I) Stainless steel welded pipe (grade Y) GB3280-2007 Stainless steel cold plate (Grade I) Stainless steel hot plate (grade I) GB4239-91 stainless steel cold belt (grade I)
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