The hot dip galvalume steel is a kind of coated steel. With the cold rolled steel of different strength and thickness as substrate,it is produced through applying Al-Zn coat on both faces by hot dip process. In its coating, Al accounts for about 55%, Si 1.6%, Zn 43.4%. It enjoys both the physical protective feature and durability of Al and the electrochemical protective property of Zn. And its surface has bright silver color and regular embossed-like figure,which are highly decorative.Surface treatment methods: anti-finger print, oiled, oiled and chromated, passivated.The following are related to China best 0.5mm thick galvanized steel sheet Cold Rolled Steel Sheet Galvanized steel coil GI coil, New product G550 aluzinc anti finger coil az 60 sheet roll for medical use.