Casing Pipe, Seamless Steel Pipe, High Pressure Boiler Tube manufacturer / supplier in China, offering API 5L X52 X60 X70 X65 ERW Welded Steel Pipe for Oil and Gas Project, Hot Sale SAE 4330 4330V 4340 4335 Alloy Pipe Seamless Steel Pipe, ASTM A210 Gr. C / ASME SA210 A1/SA192 High Pressure Seamless Steel Tube for Boiler and so on.