Aluminum zinc coated steel plate (galvalume steel) is an alloy coated steel plate widely used in various fields such as building materials, household appliances, automobiles, environment, machinery, ships, etc. Aluminum zinc coated steel plate is an alloy coated steel plate that is coated with aluminum zinc alloy on the surface of the steel plate, consisting of 55% aluminum, 43.4% zinc, and 1.6% silicon solidified at a high temperature of 600 ℃. Its entire structure is composed of aluminum iron silicon zinc, forming a dense quaternary crystal.