Stainless Steel Pipe Standard Classification

4-1 Classification Classification:
① National standard GB ② Industry standard YB ③ Local standard ④ Enterprise standard Q/CB
4-2 Categories:
① Product standards ② packaging standards ③ method standards ④ basic standards
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 bar (Grade I) GB4241-84 stainless welding disk (Grade H)
GB4356-84 Stainless welding disk (Class I) GB1270-80 stainless pipe (Class I)
GB12771-91 Stainless welded pipe (Y level) GB3280-84 stainless cold plate (I level)
GB4237-84 Stainless hot plate (Class I) GB4239-91 Stainless Cold Belt (Class I)