Galvanized coil and galvanized sheet refers to dip steel sheet in a melted zinc tank to adhere a layer of zinc on its surface. It mainly uses the technology of continuous galvanizing process,which means put a roll of steel plate continuously into the melting zinc plating tank to make and alloy galvanized steel plate. This steel plate is also made by the technology of hot dip, which is heated to about 500℃immediately after the trough , so that it generates an alloy film of zinc and iron. This galvanized coil has good coating adhesion and weld-ability.

Zinc layer of the product is from Z20g to Z275g, thickness is 0.11-0.6mm, width is up to 1250MM

Galvanizing is a cost-effective method of rust prevention that is often used, and about half of zinc production is used in this process. Galvanized steel plate is used to prevent the surface corrosion of steel plate so that to prolong its service life. Coated with a layer of metal zinc on the surface of the steel plate is referred to as galvanized plate. 

According to the production and processing methods, it can be divided into the following categories:

1.Hot dip galvanized steel sheet. This kind of steel sheet is dipped into a melted zinc tank to adhere a layer of zinc on its surface. It mainly uses the technology of continuous galvanizing process,which means put a roll of steel plate continuously into the melting zinc plating tank to make galvanized steel plate.

2.Alloy galvanized steel sheet. This kind of steel sheet is also made by the technology of hot dip, but heated to about 500℃immediately after the trough , so that it generates an alloy film of zinc and iron. This kind of galvanized coil has good coating adhesion and weld-ability.

3.Galvanized steel sheet. This kind of galvanized steel sheet is made by electroplating and has good machinability. But the coating is thin so that the corrosion resistance is not as good as hot dip galvanized sheet;

4.Single-sided galvanized steel plate and double-sided difference galvanized steel plate. Single-sided galvanized steel plate refers to the product with only one side of galvanized. In welding, coating, rust treatment, processing and other aspects, it has better adaptability than double-sided galvanized sheet. In order to overcome the shortcomings of single galvanized sheet, another side of the galvanized sheet is also coated with a thin layer of zinc, that is, double-sided difference galvanized sheet;

Advantages of galvanized sheet: strong corrosion resistance. It can prevent the surface of steel plate from being corroded to prolong its service life. And galvanized sheet looks very clean, more beautiful, which increases its decorative effect. Its strong surface antioxidant capacity enhances rust resistance ability

Galvanized sheet is mainly used in air conditioning, refrigerator and other industries. For example, the rear panel of the indoor unit of the air conditioner, the rear panel of the cabinet, and the indoor chassis are all made of galvanized sheet. these places will encounter rain, sun, hot gas corrosion and other strong oxidation conditions. Therefore, galvanized sheet is often chosen in those working environments.

Galvanized sheet is mainly used in construction, household appliances, automobile and metallurgy industries. Among them, in the construction industry,it is mainly used for roof, doors and Windows, rolling curtain doors, ceiling keel and so on.;In the household appliances, it is used for refrigerators, washing machines and so on; In the automobile industry, it is mainly used for body shell, chassis, doors, fuel tank, fender and so on. ; In the metallurgical industry, it is mainly used for steel window billet, color coated plate substrate and so on.

Zinc layer is from 20g to 275g.The higher the zinc layer, the longer service life and greater corrosion resistance.

Coating definition:

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

2.Minimized spangle coating. In the solidification process of zinc layer, zinc grains are artificially limited and form a layer with as small zinc flower morphology as possible.

3.Spangle-free coating.By adjusting the chemical composition of the bath, the coating has uniform surface without visible zinc flower morphology.

4.Zinc-iron alloy coating. The whole coating zinc form a zinc and iron alloy layer after the heating treatment of the steel strip through the zinc bath. The appearance of the coating is dark gray without metallic luster.  It is easy to powder in the process of violent molding, so it is suitable for coating that can be directly painted without further treatment besides general cleaning.  

5.Differential coating. For both sides of galvanized steel sheet, different zinc layer weight coating is required.

6.Skin pass. Skin pass is a cold rolling processing of galvanized steel with a minimal amount of deformation for one or more of the following purposes:

Improve the surface appearance of galvanized steel plate to make it suitable for decorative coating; The finished product can not see the processing of the slip line (Luders line) or the phenomenon of folding temporarily reduced to minimum