Casing Pipe, Seamless Steel Pipe, High Pressure Boiler Tube manufacturer / supplier in China, offering API 5L X52 X42 X52n X56 X60 X65 Carbon Steel Pipe Seamless Line Pipe /Natural Oil and Gas Steel Pipe, Cold Drawn High Pressure ASTM A179 A192 ASME SA179 SA192 Seamless Carbon Steel Pipe for Boiler Heater, DIN2391 St35.4 St35.8 St37 A210 A178 /SA178/A178c Seamless Steel Pipe for Hydraulic Pipe and so on.