We, 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 carbon steel pipes including oil & gas line pipe, rolled steel pipes, joist frame structure pipes, machinery roller -making pipes, concrete filled steel tubular structure, fluids conveying pipe, structure building pipes.The dimension of our products covers such a scope as followings: For oil and gas pipes: Grade: X80 or/and lower, Diameter: Φ406-1524mm, Wall thickness: 6-40mm, Unit length: 8-12mFor structural pipes: Diameter:Φ350-1600mm, Wall thickness: 6-60mm Unit length:6-12mFor rolled pipes:Diameter: Φ1200-3800mm, Wall thickness:12-120mm, Maximum unit length: 3.2mAll our production and inspection abide by API certificate. If necessary, we can provide the copy of API certificateShould you have interest of items mentioned above? Please kindly let us know by return mail. For more information, you are invited to visit our web site: www.hfzijin.comWe are always looking forward to further cooperation with you. Best regardsMs. April Ji Marketing DepartmentHefei Zijin Steel Tube Manufacturing Co., Ltd. Address: Jingsan Road Baohe Industrial Centre Hefei Anhui China 230088 Tel.:+86-551-3367701, 3367888-171Fax: +86-551-3368553Email:april dot ji at 163 dot comMSN: april dot ji at 163 dot comWebsite: www dot hfzijin dot com