Galvanized steel pipe(GI) is molten matrix metal and iron alloy layer produced by the reaction, so that the substrate and coating combination of both. Galvanized steel is first pickled, the steel surface in order to remove iron oxide, after pickling, cleaning by a mixed aqueous solution of ammonium chloride bath or an aqueous solution of zinc chloride or ammonium chloride and zinc chloride, and then sent to a thermal dip plating bath. Has galvanized coating uniformity, strong adhesion, long life and other advantages. Galvanized steel substrate and the molten bath complicated physical, chemical reaction, the formation of corrosion-resistant compact structure of zinc-iron alloy layers. Alloy layer and the pure zinc layer, integrated steel substrate. So its resistant to corrosion.

Mild steel pipe(MS) carbon content less than 0.25% of carbon steel, because of its low intensity, low and soft hardness, so called soft steel. It includes most of the part of ordinary carbon steel and high-quality carbon structural steel, mostly without heat treatment used in engineering structures, and some other mechanical parts by carburizing and heat treatment requirements for wear. Mild steel annealing organization ferrite and pearlite, lower its strength and hardness, ductility and toughness. Therefore, its good cold formability, can curling, bending, stamping and other cold forming methods. This steel also has good weldability. Carbon content from 0.10 to 0.30% of low-carbon steel is easy to accept all kinds of processing, such as forging, welding and cutting, commonly used in the manufacture of chains, rivets, bolts, shafts, etc.