Galvanized iron sheet is a building material, which is made of mild steel sheet and coated with a layer of zinc on the surface. Galvanizing is an economical and effective anti-rust method that is often used. Its surface is smooth and shiny with big spangles, regular spangles, small spangles, or zero spangles.

Types of Galvanized Iron Sheet

There are different types of GI sheets. For example, due to the different galvanizing methods, there are hot-dip galvanized sheets and electro-galvanized steel sheets.

Hot dipped galvanized sheet is mainly produced by the continuous galvanizing process. That is, the zinc coating is applied by continuously immersing the steel coil in the molten zinc bath at temperatures of 450 degrees. This process provides a thick zinc coating that freezes into crystallized zinc spangles. The thick zinc coating offers full protection for the base steel. That’s why its service life is more than 30 years under normal conditions. By the way, the zinc layer at Wanzhi Steel is Z40-275 g/m2.

Electro-galvanized sheet often uses cold rolled steel as the base metal. Then the zinc coating of the electro-galvanized sheet is applied by electro-deposition. The continuous electrolytic coating process offers a thin but very uniform zinc coating. So the electro-galvanized steel has a smoother appearance. However, its corrosion resistance is not as good as that of hot-dip galvanized steel.

GI Sheet Uses

Galvanized steel sheet is a versatile product in various applications.

1. Construction industry — such as roofing sheets, wall panels, fencing, gutters, roof grills, balcony panels, window frames, warehouses, rolling doors, door panels, pipes, and much more.

2. Automotive industry — outer shells of car or tractor, bicycle frame, inner panels, bottom plates, container, highway fence, ship bulkhead, agricultural machinery, etc.

3. Light industry — shells and back panels of various household appliances, such as air conditioners, washing machines, refrigerators, microwave ovens, water heaters, chimneys, kitchen utensils, etc.

4. Furniture industry — wardrobe, table, bedside cabinet, file cabinet, bookshelf, and other uses;

5. Other uses — outdoor billboard, hopper, nuts, bolts, and nails, solar projects,  bucket, fermentation tank, and so on.