Seamless Steel Pipe manufacturer / supplier in China, offering API 5L X52 / Gr. B DN400 16 Inch 406.4mm LSAW ERW Steel Water Pipe, 125ksi Yield Strength API 5CT Q125 Seamless Steel Casing Pipe for Shale Gas & High-Pressure Wells, En 10219 S235jrh Seamless Hot Finished ERW Saw SSAW LSAW Efw Welded Carbon Steel Structural Round Square Rectangular Pipe and so on.