For galvanized coils, the thin steel plate is immersed in the molten zinc bath, so that a thin steel plate with a layer of zinc is adhered to the surface. At present, the continuous galvanizing process is mainly used for production, that is, the coiled steel sheet is continuously immersed in a galvanized bath with molten zinc to make a galvanized steel sheet; alloyed galvanized steel sheet. This kind of steel plate is also manufactured by hot dipping method, but immediately after leaving the tank, it is heated to about 500°C to form an alloy film of zinc and iron. This galvanized coil has good paint adhesion and weldability.Galvanized coil products are mainly used in construction, light industry, automobile, agriculture, animal husbandry and fishery and commerce industries. Among them, the construction industry is mainly used to manufacture anti-corrosion industrial and civil building roof panels, roof grills, etc.; the light industry uses it to manufacture household appliance shells, civil chimneys, kitchen appliances, etc., and the automobile industry is mainly used to manufacture corrosion-resistant parts for cars, etc. ;Agriculture, animal husbandry and fishery are mainly used as food storage and transportation, meat and aquatic products refrigeration processing tools, etc.; commercial use is mainly used as material storage and transportation, packaging tools, etc.