Galvalume Steel Coil Production Process

Galvalume steel coil production involves applying a protective coating of aluminum and zinc to steel coils to enhance corrosion resistance. Here’s an overview of the typical Galvalume steel coil production process:

Raw Material Preparation

High-quality flat steel coils, usually made from carbon steel, are selected for the Galvalume process.

Cleaning and Surface Preparation

The steel coils undergo cleaning processes, such as pickling, to remove any rust, scale, or contaminants from the surface.

Annealing (Optional)

Some steel coils may undergo annealing, a heat treatment process, to improve their ductility and facilitate further processing.

Coil Forming

The cleaned and possibly annealed steel coils are formed into continuous coils or sheets for easier handling during subsequent processes.

Coating Application

The Galvalume coating is typically applied using a continuous hot-dip process. The steel coils are passed through a bath of molten aluminum, followed by a bath of molten zinc.

Air Knife or Wiping

As the coated steel coils are withdrawn from the coating baths, excess aluminum and zinc are removed using air knives or wiping devices to achieve the desired coating thickness.


The Galvalume-coated steel coils are then cooled to solidify and set the aluminum-zinc coating.

Skin Pass Rolling

Some manufacturers employ a skin pass rolling process, where the Galvalume-coated coils pass through a set of rollers to improve surface finish and flatness.

Tension Leveling

Tension leveling may be performed to ensure uniform thickness and flatness of the Galvalume-coated coils.

Inspection and Testing

The Galvalume-coated coils undergo thorough inspection and testing to ensure they meet specified standards. This may include visual inspection, thickness measurement of the coating, and other quality control measures.

Post-Treatment (Optional)

Some Galvalume-coated coils may undergo additional post-treatment processes, such as applying a clear acrylic coating, to enhance their properties and appearance.

Cutting and Packaging

The final step involves cutting the Galvalume-coated coils to the desired sizes and packaging them for shipment. These coils are often delivered to manufacturers for use in various applications, such as roofing, siding, and automotive components.

It’s important to note that the specific details of the Galvalume steel coil production process may vary between manufacturers. Adherence to industry standards and quality control measures is crucial throughout the production process to ensure the coated steel meets the required specifications for corrosion resistance and durability.