Hot-Dipped Galvanized Steel (GI) is made from hot or cold-rolled steel that is coated with zinc by the hot-dip process which deposits a layer of Zinc onto the surface by passing the strip through a molten bath of zinc.
As the strip exists in the molten bath of zinc, air knives are used to remove the excess zinc to achieve the desired coating weight.
The zinc coating prevents corrosive substances from reaching the underlying metal. Any steel product that requires protection from corrosive substances in the environment from reaching the underlying steel is a good candidate for hot-dipped galvanized material.
Galvanized steel is designated with a “G” (G40, G60, G90). The number is the weight of the coating in ounces per square foot. G60, for example, is 0.60 ounces per square foot. (Which adds an ‘average’ thickness of about 0.0005 inches to the steel.).