Stainless steel welded tube / pipe: 1. Standard: GB, ASTM, JIS, DIN, EN, AISI 2. Material ... : 304, 304L, 316, 316L, etc Stainless steel welded tube / pipe:1. Standard: GB, ASTM, JIS, DIN, EN, AISI2. Material: 304 ... industries.7. Technics: bead removed, bright annealed, pickling, electropolishing, mechanical polishing.8. Test: eddy current, hydrostatic test, mechanical properties test, chemical ...