... , 24 inches, 30 inches. 2.But according to need to customize. 1.In addition to 24 inches oil pipeline interfaceand 20 inches, 24 ... inches, 30 inches. 2.Use, used in oil or ... mn2 has high strength, good toughness, easy to welding and other characteristics, widely used in petroleum pipeline connection. 3.Process: forging, ...