Galvanized aluminium zinc steel plate is widely used in building materials, home appliances, automotive, environmental, mechanical, Marine, and many other areas,which is an alloy coated steel.Aluminium zinc steel plate is covered in aluminum zinc alloy steel plate surface treatment, aluminum, zinc and 43.4% 55% from 43.4% silicon at 600 ℃ high temperature solidification and composition, its whole structure by aluminum - iron - silicon - zinc, forming dense four yuan form crystal of an alloy coated steel.