Steel Pipes, Flange, Pipe Spool manufacturer / supplier in China, offering Sch40 Black Seamless Carbon Steel Pipe for Water, Oil and Gas Galveanized Carbon Steel Welded Seamless Pipe, Spiral Welded Steel Pipe Large Diameter API 5L Spiral Welded Pipe, SSAW ASTM A252 Standard Piling Pipes Spiral Steel 20 22 24 28 72 Inch 350mm and so on.