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 12/18/20/22 Inch A53 API 5L SSAW Steel Tube Large Diameter Steel Pipe, Hot Sale SAE 4330 4330V 4340 4335 Alloy Pipe Seamless Steel Pipe and so on.