Galvanized (GI) steel coils/sheets are also called hot-dip zinc steel coils/sheets or hot-dipped galvanized steel coils/sheets, Galvanized (GI) steel coils/sheets based on cold rolled steel strips through hot-dipped galvanizing process, the surface have excellent corrosion-resistant performance and excellent machining. Galvanized (GI) steel coils/sheets are mainly used in building, light industry, automobile, etc. In construction industry, galvanized steel coils/sheets are mainly used in manufacturing roofing panels, roofing grille, etc. Galvanized steel coils/sheets (GI) are the good base metal for PPGI steel coils/sheets.