Continuous hot dip galvanized sheet steel

• Continuous hot dip galvanized steel sheet, referred to as galvanized sheet or white sheet, is a cold-rolled continuous hot dip galvanized steel sheet and steel strip with thickness of 0.25~2.5mm. The steel strip is first burned off the residual oil on the surface through the preheating furnace heated by flame, and at the same time, the iron oxide film is generated on the surface, and then heated to 710~920℃ in the reduction annealing furnace containing H2 and N2 mixture gas. The iron oxide film was reduced to sponge iron, and the activated and purified strip was cooled to a temperature slightly higher than that of molten zinc, then the strip was put into a zinc pot at 450~460℃, and the surface thickness of the zinc layer was controlled by an air knife. Finally, chromate solution passivation treatment to improve the resistance to white rust.

 Z- normal zinc flower: according to the normal cooling speed crystallization of zinc flower, can be used for general purposes: X- small zinc flower: cooling speed by special control, zinc flower size is smaller than normal zinc flower, suitable for painting and normal zinc flower can not meet the requirements of other occasions; GZ- Finish zinc flower: the small zinc flower after finishing treatment, suitable for deep and ultra deep stamping and surface roughness requirements of the occasions.