Galvanized Steel Coil gets coated in layers of zinc because rust won't attack this protective metal. The most external layer is all zinc, but successive layers are a mixture of zinc and iron, with an interior of pure steel. These multiple layers are responsible for the amazing property of the metal to withstand corrosion-inducing circumstances. Zinc also protects the steel by acting as a "sacrificial layer."

Standard	AISI,ASTM,GB,JIS
Material	SGCC,SGCH,G550,DX51D,DX52D,DX53D
Thickness	0.12-4.0mm
Width	600-1500 mm
Tolerance	+/-0.02mm
Zinc coating	40-600g/m2
Surface treatment	Unoil,dry,chromate passivated, non-chromate passivated
Spangle	Regular spangle,minimal spangle, zero spangle,big spangle
Technique	Hot rolled, cold rolled