Galvanized coil, the thin steel plate is dipped into the melted zinc tank, so that its surface adheres to a layer of zinc thin steel plate. It is mainly produced by continuous galvanizing process, that is, the rolled steel plate is continuously dipped in the plating tank with melted zinc to make galvanized steel plate. Alloyed galvanized steel sheet. This steel plate is also made by hot dipping, but immediately after the tank is heated to about 500 ° C, so that it generates an alloy coating of zinc and iron. This galvanized coil has good coating adhesion and weldability.

(1) Normal zinc coating spangle coating

In the normal solidification process of zinc layer, zinc grains grow freely and form a coating with obvious zinc flower morphology.

(2) minimized spangle coating

During the solidification process of zinc layer, the zinc grains are artificially limited to form the smallest zinc flower coating as possible.

(3) zinc-free coating spangle-free

By adjusting the chemical composition of the plating solution, there is no visible zinc flower morphology, and the surface is uniform.

(4) zinc-iron alloy coating

Heat treatment of the steel strip after the galvanized bath, so that the entire coating to produce zinc and iron alloy layer, this coating appearance is dark gray, no metallic luster, easy to powder in the vigorous forming process, suitable for in addition to general cleaning, without further treatment can be directly painted coating.

(5) differential coating

On both sides of the galvanized steel sheet, a coating with different zinc layer weights is required.

(6) skin pass

Finishing is a cold rolling process of small deformation on galvanized steel plates for one or more of the following purposes.

Improve the surface appearance of galvanized steel or suitable for decorative coating; To temporarily minimize the phenomenon of slip lines (Luders lines) or creases that occur when the finished product is not processed.