GI

Machinability

Hot-dip zinc-coated steel, which is manufactured through a continuous zinc-coated plating process, has excellent zinc adhesion and very thin iron–zinc alloy layer. Thus, the plating layer is hardly detached even in the drawing process. The hot-dip zinc-coated steel is manufactured through a vertical furnace rather than the existing horizontal furnace. It has good machinability similar to cold rolled steel so that it can be used in various works.

Paintability

Hot-dip zinc-coated steel is usually used after painting. The adhesion and corrosion resistance after painting is largely affected by the coating pretreatment process. Most materials for painting use oiling processing for anticorrosion without using a chromate treatment. Complete degreasing before painting leads to a good reaction of phosphate coating or chrome coating. Thus, it secures good coating film adhesion and corrosion resistance.