Carbon Steel Pipe, Stainless Steel Pipe, Copper Nickel Tube manufacturer / supplier in China, offering ASTM A53/API 5L Carbon Steel Casing Pipes for Oil Industry, ASTM A192 Seamless Carbon Steel Boiler Tubes for High-Pressure Applications, ASME B36.19 ASTM A53/A106 Gr. B Low Temperatures Seamless Carbon Steel Tube Pipe and so on.