20g seamless steel pipe Use for power plant OD:219-1120mm ... ,WP9,WP11,WP22,WP91 ;15CrMoG;12Cr1MoVG,10CrMo9102.Standard as below: 20g seamless steel pipe16MnSTS49STPT49G3455G3456A210-CSt52.4St521.08321.0831DIN1629/4DIN1629/315MnVSTBL39G346416MnSTPL39G3460A333-1 ... . Surface:oiled or painted black5.Marking:According to custommers' requirements 20g seamless steel pipe