Galvanized steel coils are covered with a zinc coating to provide corrosion resistance. G40 galvanized steel coil is a galvanized layer name or A653 standard specification specified in the hot-dip coating process galvanized or zinc-iron alloy steel coil requirements.

G60 is the coating grade of steel coil after continuous hot dip plating process. G represents the galvanized or galvanized layer of the product. The number 60 refers to the weight of the zinc around the steel coil or the thickness of the entire double-sided coating.

G90 refers to the coating type and coating weight on the steel coil. means that the coating is galvanized. Meanwhile, the number represents the weight of zinc on the steel. G90 galvanized steel is hot-dip galvanized cold-rolled steel to improve durability.