... Surface: mirror, satin, HL, etc3. Staibless steel welded pipe include: Round tube, square tube, rectangle tube, screw tube, embossed tube, bizarre ... , 70% before loading8. Export standard packagingGood quality of stainless steel welded pipe: ProductStainless steel welded pipe StandardASTM A554, A249, A269 and A270, ... 35%≥35% Hardness (HV)<253<253<200<200 Good quality 304 stainless steel welded pipe