Household Prepainted Galvanized Steel Coil Industrial Construction
Galvanized sheet or coil is defined as a carbon steel sheet coated with zinc on both sides. Continuous hot
dipping, or electro-galvanizing are the two processes used to produce galvanized sheet and coil. Generally speaking, the hot
dip process consists of passing the steel through a bath of molten zinc. The electro-galvanizing process consists of the application of zinc by electrolytic disposition. The result is a layer of
zinc tightly adhering to the base metal through an iron-zinc bonding layer.
A zinc coating is one of the most effective and economical methods of protecting bare steel from a
corroding environment. The zinc not only serves as a barrier between the steel and the environment, it will
sacrifice itself to protect the underlying steel sheet. Sacrificial, or galvanic protection occurs when two
dissimilar metals are in contact and coupled with water and oxygen. Zinc corrodes preferentially to the iron
in steel. This protection prevents corrosion of the steel at areas not covered with zinc. Thus, the spread of
corrosion from cut edges, drill holes, etc. is minimized.
Our Hot-dipped Galvanized products, as well as our Galvannealed (zinc-iron alloy coated) products are
manufactured to ASTM A-653 specifications. Our Electrogalvanized products conform to ASTM A-879.
Material Types for Galvanized Coil and Sheet Steel
Commercial Steel (CS Types A, B, and C)
Forming Steel (FS Types A and B)
Deep Drawing Steel (DDS Types A and C)
Extra Deep Drawing Steel (EDDS)
Structural Steel (SS) – further designated by Grades (33,37,40,50,80)
High Strength Low Alloy Steel (HSLAS)
In addition, the Hot Dipped Galvanized as well as the Galvannealed products are available in a variety of
coating weights including G-90, G-60, G-40, and G-30 for the Hot Dipped Galvanized products, and A-60
and A-40 for the Galvannealed products.