Casing Pipe, Seamless Steel Pipe, High Pressure Boiler Tube manufacturer / supplier in China, offering ASTM A213 T11 T12 T13 T22 T1 T2 Alloy High Pressure Seamless Steel Pipe, 4140 4130 4340 4330 ASTM Steel Tube Alloy Steel Seamless Steel Tube, API 5L Grade X52, X52n, X56, X56n, X60, X65, X70 Line Pipe Black Carbon Steel Pipe API 5L Carbon Steel Seamless Pipe and so on.