Carbon Steel Pipe, Stainless Steel Pipe, Copper Nickel Tube manufacturer / supplier in China, offering API 5CT J55/K55 N80/N80q/L80 LSAW Carbonsteel Pipe for Oil Well Casings, En 12451 C70600 Seamless Copper Nickel Tube for Marine Heat Exchangers and Desalination Systems, Petroleum and Natural Gas ISO 3183 Steel Pipe for Pipeline Transportation Systems and so on.