Galvalume (GL) is a base steel coated with an alloy consisting of 55% Aluminum (Al), 43.5% Zinc (Zn), and 1.5% Silicon (Si), providing 3-4 times higher corrosion resistance compared to Galvanized Iron (GI). This coating combines the rust resistance of Zinc with the oxidation resistance of Aluminum, ensuring long-lasting durability in various environmental conditions.
2. Key Differences and Outstanding Advantages
Very good Corrosion Resistance – Ideal for coastal areas and harsh environments.
High Heat Reflectivity – Reduces heat absorption, improving energy efficiency.
Crack and Peel Resistance – Ensures long-term adhesion and durability.
3. Technical Specifications
Base Steel Strength: G350 - G550 Coating Weight: AZ20 - AZ200 (g/m²) Width Options: 762mm - 1250mm Thickness Range: 0.20 - 0.80 mm Base Steel Suppliers: Posco, Hoa Phat, Formosa
4. Production Process
1️⃣ Surface Treatment – Cleaning and preparing the steel base. 2️⃣ Hot-Dip Aluminum-Zinc Coating – Applying the alloy coating. 3️⃣ Cooling & Adhesion Testing – Ensuring coating quality. 4️⃣ Leveling & Packaging – Achieving a smooth surface and finalizing the product.
5. Quality Standards
Corrosion Resistance: ASTM A792 Coating Adhesion: JIS G3321 Mechanical Strength Testing: EN 10346
6. Applications of GL Steel
Construction: Roofing, wall panels for industrial and residential buildings. Home Appliances: Cold storage equipment, household electronics. Automotive & Shipbuilding: Durable materials for vehicle and ship structures. Electronics Industry: Protective and functional components.
