Galvanized and Galvannealed Steel Coils

Galvanized is produced from Cold Rolled (or Hot Rolled Pickled & Oiled) coil that has been passed continuously through a pot of molten zinc. The amount of coating applied to the surface is controlled by wiping, rollers and/or air jets. The coated product is then cooled and passes through leveling equipment. The zinc coating protects the steel substrate in two ways. First, it creates a barrier that retards the formation of rust. Second, zinc has a self-sacrificial character and will extend itself to cover nearby small uncoated areas (i.e., cut edges, scratches).There is generally a direct correlation between the amount of zinc application and the steel's atmospheric corrosion resistance. The more the zinc, the more the corrosion resistance. The amount of zinc (referred to as coating weight) is represented in ounces per square foot (or sometimes grams per square meter) total both sides. Its designation, for example, may be G60 (or A60, in the case of Galvannealed), constituting .60 oz/ft2. As such, the material would have approximately one-third less protection than G90 (.90 oz/ft2).Galvanized (and Galvannealed) are typically produced in accordance with ASTM A653 standards and tolerances.

Galvanized and Galvannealed Steel Coils