What Is Galvanized Steel Coil?

Galvanized steel is defined as a carbon steel sheet that is coated with zinc on both sides. The galvanized steel coils supplier produces galvanized steel through two main processes: continuous hot-dip galvanizing and electro-galvanizing.

The hot dip process involves passing the steel through a molten zinc bath, while the electro-galvanizing process involves applying zinc through electrolytic treatment. As a result, the zinc layer adheres firmly to the base metal through an iron-zinc bonding layer. Our hot-dip galvanized steel coils are manufactured to specification, and our electro-galvanized products also meet specifications.

Galvanizing is one of the most effective and economical ways to protect bare steel from corrosive environments. Not only does zinc act as a barrier between the steel and the environment, but it also sacrifices itself to protect the steel sheet below. Sacrificial or galvanic protection occurs when two different metals come into contact and couple with water and oxygen. Zinc preferentially corrodes the iron in the steel. This protection prevents corrosion of the steel in areas that are not covered with zinc. Thus, the spread of corrosion from cutting edges, drilling, etc. is minimized.

 Hot-dip Galvanized Steel Coils

Many people know what galvanized steel is. It is used in a variety of applications from HVAC ductwork to garden barrels. Home decorations to garbage cans. The shiny surface makes it visually appealing, but it is also more durable and corrosion resistant. So, how is galvanized steel made? Where do the sequins come from? Let's find out.

Galvanized steel is carbon steel coated with zinc. The most common method of galvanizing is the hot-dip process. The hot dipping process involves dipping the carbon steel into a molten zinc bath (approximately 680 degrees Fahrenheit). After the material is removed from the zinc bath and cooled, it reacts with oxygen in the air. This reaction causes the zinc to become part of the steel (iron-zinc alloy bond). The new surface treatment appears to have a crystalline finish or a bright finish.

Although this is the most common form of galvanizing, it is usually used on previously manufactured steel because the thickness of the final product is not easily controlled. Another method of the galvanizing process is continuous galvanizing.

After passing through a zinc bath, continuous galvanizing is applied to the surface of a continuous strip (coil) of steel. The coil runs at a speed of approximately 600 feet per minute. As the coil leaves the zinc bath, it takes with it an additional layer of molten zinc. Excess zinc is removed using high pressure air (air knife) to create the desired thickness. The material is then allowed to cool and develop a glossy finish. Skipped galvanized steel and continuous galvanizing allow for more precise control of thickness and are typically used on unproduced steel. As the thickness of the coating increases, so does the risk of losing some of the coating during fabrication or forming.

Hot-dipped galvanized steel and thin steel sheets are produced for important corrosion resistance applications. The zinc coating extends the life of the final product and is ideal for manufacturers. The attractive surface finish also satisfies consumers.

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