Our company was established in 2007 in the famous steel pipe production zone in China. Doublewin's metal material sector has substantial experience in copper bushing, steel wire, steel tube and steel pipe production. Our products include medium and small diameter hot-rolled seamless tube, cold-rolled and cold drawing seamless tube, medium and large diameter high frequency ERW pipe, large diameter SSAW pipe, galvanized pipe, insulation tube, anti-corrosion tube, oil casing pipe, etc. Our company ...