... seamless carbon steel P110 Pipe ,pipe fitting 1.Grade: J55,K55,N80,L80,P110 2.Thread: BTC,LTC,STC 3.Standrad:API API seamless carbon steel P110 Pipe ,pipe ... Ltd. in April 2011. (Formerly known as YingKou OuYang Steel Tube Co., Ltd.)YingKou OuYang Metal Manufacturing Co., Ltd. is ... tubing, casing coupling, pup joint, reducer union, drill pipe coupling and also can process the special specification as the ...