Galvalume steel coils are based on cold-rolled steel sheets, coated with an alloy coating of 55% aluminum, 43.4% zinc, and 1.6% silicon via a hot-dip coating process. The core components of galvalume steel are aluminum, zinc, and silicon, which are fused at high temperatures to form a dense quaternary crystalline structure, combining the physical protection of aluminum with the electrochemical protection of zinc.