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GI with Big Spangle refers to Galvanized Steel with a large, noticeable spangle pattern on its surface. This spangle pattern is created during the hot-dip galvanizing process, where the steel is immersed in a bath of molten zinc to form a protective zinc coating.
keyword: Galvanizing, aluminum-zinc plating
Hot Dipped Galvanized Steel Sheet in Coil (GI) is produced by passing the Full Hard sheet which has undergone the acid washing process and rolling process through the zinc pot, thereby applying zinc film to the surface. It has excellent corrosion resistance, paintability, and workability due to Zinc’s characteristics. Usually, hot-dipped galvanized steel sheet and galvanized steel coil process and specifications are basically the same.
Galvalume steel sheet (GL) is carbon steel sheet coated with aluminum-zinc alloy by a continuous hot dip process similar to the galvanizing process. The nominal coating composition is 55% aluminum and 45% zinc.
The coating composition consists of 55% aluminium and 43.4% zinc and 1.6% silicon by weight. 55% aluminum-zinc alloy coated aluminum-zinc steel sheet has superior corrosion resistance compared to galvanized steel sheet of the same thickness when exposed to the same environment on both sides, the 55% aluminum-zinc alloy coated aluminum-zinc steel plate not only has good corrosion resistance, but also has very strong adhesion to the color-coated products.
Galvanised Metallic coated sheet,specifically continuously hot-dip zinc-coated(galvanised) sheet,is a well-known product with a versatile range of applications in general industry, buildings, construction and appliances.