... : ASTM A106, ASTM A53 Seamless Steel Pipe(1) ASTM A 106, ASTM A 53, ASTM A179, API 5L ... :ST37,ST44,ST52-3,S235JR ,E355) EN 10210-2, EN10216-1(3)Size: OD: 21.3mm to 508.0mm(4)Thickness ... according to customers' requirements(6) Packing:International standard packing(seamless pipe,steel tube ,steel pipe ) Seamless Steel ...