With the continuous expansion of the use of hot-dip galvanized sheet, in the modern continuous hot-dip galvanizing line, the following objectives can be achieved by finishing the strip:
① The flatness and flatness of the sheet can be improved, and the zinc particles on the surface can be flattened to make the strip surface smooth, which is especially beneficial for deep drawing and other occasions with high precision;
② The finishing
roller used has been shot peened in advance, so the surface of the plate after finishing has a certain roughness. It can improve the adhesion of the coating and store a certain amount of grease, which is beneficial to the lubrication of the die in deep
③ For the later coated plate, although the surface is controlled to be small zinc flower, the small zinc flower can still be exposed through the paint layer. Therefore, for some high requirements of galvanized sheet, the surface of small
zinc flower needs to be polished. In this way, the galvanized sheet can obtain a more uniform silver white appearance;
④ Through finishing, the lower yield point can be reduced, the yield platform can be disappeared or not obvious, the slip line
can be prevented in later drawing or deep drawing, and the deep drawing property can be improved.