Carbon Steel Pipe, Stainless Steel Pipe, Copper Nickel Tube manufacturer / supplier in China, offering ASTM A252 Welded Carbon Steel Pipes Od 3/4/5/6" SRL/DRL 20/40FT, ASTM A179/A210 Boiler Steel Pipe Seamless Tube Manufacturer for Oil Refinery, Large Diameter SSAW Spiral Welded Carbon Steel Pipe for Offshore Structure and Foundation Piling and so on.