Hot Dip Zinc Coated Steel Sheet and Galvannealed Steel Sheet are commonly used in the manufacturing industry due to their excellent corrosion resistance and durability. Developed under ASTM A653 / A653M-18 Standard Specification, these two coatings are the result of a complex process that includes dipping the steel sheet in a molten zinc or zinc-iron alloy bath.
The hot-dip process, as it is commonly referred to, involves passing the steel sheet through multiple cleaning and preparation stages before it is submerged in the molten coating bath. The bath temperature can range between 440 degrees Celsius to 460 degrees Celsius, depending on the type of coating required. As the steel sheet is immersed in the coating bath, a chemical reaction occurs, and the molten zinc or zinc-iron alloy adheres to the surface of the sheet, forming a uniform coating.
The thickness of the coating is controlled by the duration of the immersion and the speed at which the coated sheet is withdrawn from the bath. ASTM A653 / A653M-18 Standard Specification defines the required thickness range for each type of coating. For Zinc-Coated (Galvanized) Steel Sheet, the coating thickness should be between 0.0149 inches to 0.108 inches. For Zinc-Iron Alloy-Coated (Galvannealed) Steel Sheet, the coating thickness should be between 0.0185 inches to 0.043 inches.
The Steel Coating industry generates more than $149 billion in revenue annually, and Zinc Coating is a significant contributor to this sector. Zinc Coating is the most commonly used coating in the steel manufacturing industry due to its low cost, excellent corrosion resistance, and high durability. The use of Zinc-Iron Alloy-Coated (Galvannealed) Steel Sheet is also gaining popularity due to its improved formability and paintability, making it suitable for various applications.
The use of hot-dip Zinc Coated Steel Sheet and Galvannealed Steel Sheet is widespread in the construction industry, automotive industry, and appliance manufacturing. These materials are used for roofing, gutters, siding, and structural elements in buildings. In the automotive industry, these materials are used for the production of structural frames, body parts, and underbody components. In appliance manufacturing, Zinc Coated Steel Sheet and Galvannealed Steel Sheet are used for the production of refrigerators, washing machines, and ovens.
In summary, Zinc Coated Steel Sheet and Galvannealed Steel Sheet are essential materials in the steel manufacturing industry. Their excellent corrosion resistance and durability make them suitable for various applications. The hot-dip process used in their production is a complex process that involves multiple stages of cleaning and preparation before immersion in the coating bath. ASTM A653 / A653M-18 Standard Specification defines the required thickness range for each type of coating, and the industry generates significant revenue from the use of these materials.