Standard: GB, ASTM, API Outer Diameter: 16 - 460 mm Thickness: 3- 60 mm ... G3456,JIS G3457,JIS G3461MaterialQ235, 20#, Q345A53B, A106B, API 5L B,X42,X46,X52,X60, X65ST37.0,ST35.8,St37.2 ... experience, sincere service4. Reliable forwarder, 2-hour away from port. ASTM A 53 hot-rolled seamless steel ...