Casing Pipe, Steel Pipe, Tubing Pipe manufacturer / supplier in China, offering Seamless OCTG Casing Pipe and Oil Tubing Pipe with J55/K55/N80/L80/P110/Btc/Stc/Ltc/R3, API OCTG Casing Pipe&Tubing Pipe&Coupling (API Oilfield Services), API Oilfield Supply Service Tubing and so on.