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ASTM JIS Standard G350 / G450 / G550 Grade Galvalume Steel Coil. 25 Years Service Life: Normal service life of galvalume steel sheet is up to 25 years. Superior Corrosion Resistance: Aluminum forms a dense alumina layer to prevent further corrosion. High Thermal Reflex: Heat reflectivity is two times that of standard galvanized steel. Customizable Production: Pre-painted galvalume steel coils can be produced as per customer needs. Excellent Processing: Good adhesion allows for punching, shearing, and welding.