Aluminum-galvanized steel coil is composed of aluminum-zinc alloy structure, which is composed of 55% aluminum, 43% zinc and 2% silicon solidified at a high temperature of 600 °C, and its entire structure is composed of aluminum-iron-silicon-zinc to form an alloy of dense quaternary crystals.Aluminum-galvanized steel coil has many excellent characteristics: strong corrosion resistance, which is 3 times that of pure galvanized coil; The surface has beautiful zinc flowers, which can be used as exterior panels for building houses.