Steel Pipes, Pipes Fittings, Socket Fittings manufacturer / supplier in China, offering Seamless Carbon Steel API 5L X42 X52 X65 X70 Psl2 Psl1 Line Pipe, ASTM A335 P11 P12 6 X Sch80 Alloy Steel Tube, ASME B16.11 Carbon Steel 3000lbs Male ASTM A105 Threaded Coupling and so on.