seamless steel pipe: Grade Q195-Q345 ,Q235, Q195, Q215 Thickness 3.38 - 19.05 mm Technique Cold Drawn Seamless steel pipe: Standard: GB, ASTM A53, ASTM A106, API 5L Gr. B, Specification: OD: 8mm-426mm, WT: 1mm-60mm Seamless steel pipe1.Item: Seamless steel pipe2.Standard: GB, ASTM A53, ASTM A106, API 5L Gr. B,3.Grade: Gr. B, X42, X52, X56, A, B, J55, H80, H404.Specification: OD: 8mm-426mm, WT: ...