API 5L Spiral Welded Steel Oil Pipe

　　API 5L Spiral Welded Steel Oil Pipe is to make the molten metal and iron matrix reaction layer, resulting in both the substrate and the combination of coating. Hot dip galvanized steel pipe is the first pickling, in order to remove the surface of iron oxide steel, pickled, ammonium chloride or zinc chloride or ammonium chloride or zinc chloride aqueous solution mixed with water tank cleaning, and then into Hot-dip plating bath. Hot dip galvanized with uniform coating, strong adhesion, long life and other advantages. Galvanized pipe and the molten bath complex physical and chemical reactions, the formation of corrosion-resistant structure of a close zinc-iron alloy layer. Alloy layer and pure zinc layer, steel tube matrix integration. So its strong corrosion resistance.