Hefei Zijin Steel Tube Manufacturing Co., Ltd. is established in the year 2004 and is specialized in the developing and manufacturing of the large-diameter thick-wall straight-seam Longitudinally Submerged Arc Welded (LSAW) tubes including Oil & Gas Line pipe, Rolled Steel Tubes, Joist Frame Structure Tubes, Machinery Roller -making Tubes, Concrete Filled Steel Tubular Structure, Fluids Conveying tube, Structure Building Tubes.