... steel welded pipe with good Corrosion resistance 2. 300 series3. Surface: mirror, satin, HL, etc3. Staibless steel welded pipe include: Round tube, square tube, ... . Export standard packagingGood quality of stainless steel welded pipe: ProductStainless steel welded pipe StandardASTM A554, A249, A269 and A270, A312, ... 30%≥35%≥35% Hardness (HV)<253<253<200<200 Good quality 304 stainless steel welded pipe