A variety of surface-treated steel sheets that are available can be classified by the production method, such as hot dipping, electroplating, painting, and a combination of these. Each type of surface-treated steel sheets will be introduced hereinafter.

[Table 1] shows the types, characteristics, and major applications of hot-dipped steel sheets.

Hot-dip galvanized steel sheets constitute more than 80% of the total production volume of hot-dip galvanized steel sheets. Since not many of them are used as-is, they are usually coated prior to use.For those that are adopted without the coatings, they used be treated with chromate in order to prevent generation of white rust after being plated. Since the introduction of chromium-free antirust coating that is compliant with green procurement, chromium is no longer the antirust treatment option.
As [Table 1] clarifies, the molten and alloyed aluminum coated steel sheets are adopted for components requiring enhanced heat resistance.