As new building material, galvalurme (aluminium&zinc-silicate coated)steel, based upon the cold-rolled sleel belt is produced through continuous zinc hot coated technical process by using 55% aluminium,43%. zinc and 2% silicate.The coating layer is Zn-Ai alloy.Thanks to the good feature of corrosion resistance,the galvalume steel sheet is 2 to 6 times as high as zinc coated sheet plate in terms of air corrosion resistance with the same coating thickness. With the features of fine coating and processing ability, the product is widely used in the industries of building materials, electric appliance, auto and house hold appliance,etc.