Steel Pipe, Carbon Steel Pipe, Seamless Steel Pipe manufacturer / supplier in China, offering OCTG API 5CT L80 Seamless Casing Tube Hydril Casing and Tubing Transmission API N80 Specification Carbon Steel Pipe, Smls Tpco Seamless Oil and Gas Casing and Tubing API 5CT J55 /Psl2 for Offshore Project Oil Pipe, Seamless Smls Casing & Tubing API 5CT K55 J55 N80 L80 P110 for Drilling and Mining and so on.