Casing Pipe, Seamless Steel Pipe, High Pressure Boiler Tube manufacturer / supplier in China, offering 75ksi L80 80ksi 85ksi R95 T95 95ksi C110 P110 110ksi Q125 125ksi Alloy Steel Boiler Pipe, 35CrMo 42CrMo 4130 4130m 4140 4140m K55ksi 75ksi L80ksi Alloy Seamless Steel Pipe, API 5L Gr B X42 X52 X56 X60 X65 X70 X80 X100 Seamless Steel Pipe and so on.