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.

Galvanized sheet： 

refers to a steel sheet coated with a layer of zinc on the surface. Galvanizing is an economical and effective rust prevention method that is often used, and about half of the world's zinc production is used in this process.

According to the production and processing methods, it can be divided into the following categories:

Hot-dip galvanized steel sheet. Dip the thin steel plate into the molten zinc tank to make the thin steel plate with a layer of zinc adhered to its surface. At present, the continuous galvanizing process is mainly used for production, that is, the coiled steel plate is continuously immersed in a galvanizing tank with molten zinc to make a galvanized steel plate;

Alloyed galvanized steel plate. This kind of steel panel is also made by hot dip method, but it is heated to about 500℃ immediately after coming out of the tank, so that it can form an alloy film of zinc and iron. This galvanized sheet has good paint adhesion and weldability;

Electro-galvanized steel plate. The galvanized steel panel manufactured by electroplating has good processability. However, the coating is thinner and its corrosion resistance is not as good as that of hot-dip galvanized sheets

GI steel sheets are sheets made of galvanized iron (GI). Galvanization is the process of coating iron or steel with a layer of zinc to prevent corrosion. GI sheets are commonly used for roofing, fencing, and outdoor applications due to their durability and resistance to rust and corrosion.

The thickness of GI sheets is measured in gauge, with a lower gauge indicating a thicker sheet. The most common gauges for GI sheets range from 18 to 24. The width of GI sheets typically ranges from 600mm to 1500mm.

GI sheets are available in two types of coating: regular spangle and zero spangle. Regular spangle GI sheets have a visible spangle-like pattern on the surface, which is created during the galvanizing process. Zero spangle GI sheets, on the other hand, have a smoother surface and do not have any visible spangle pattern.

GI sheets can also be classified based on their uses. Some of the common types of GI sheets include:

1. Corrugated GI Sheets - used for roofing, wall panels, and fencing.

2. Plain GI Sheets - used for indoor applications such as ducting, electrical panels, and furniture.

3. Galvalume GI Sheets - a combination of aluminum and zinc-coated GI sheets that provide superior corrosion resistance.

4. Pre-painted GI Sheets - GI sheets coated with a layer of paint, commonly used for roofing and cladding applications.

GI sheets are available in various grades based on their strength and durability. The most commonly used grades for GI sheets are SGCC, SGHC, and DX51D.

Application：

GI sheets have a variety of applications in different industries and sectors. Some of the common applications of GI sheets are:

1. Roofing and Cladding: GI sheets are a popular choice for roofing and cladding applications due to their durability, corrosion resistance, and strength. They are commonly used in residential, commercial, and industrial buildings.

2. Fencing: GI sheets are used for creating fences and partitions due to their strength and rust-resistance properties. They are also used as boundary walls for security purposes.

3. Automotive: GI sheets are used for manufacturing automotive parts such as body panels, roofs, and chassis due to their strength and durability.

4. HVAC: GI sheets are used in the heating, ventilation, and air conditioning (HVAC) industry for ducting, air conditioning units, and ventilation systems.

5. Fabrication: GI sheets are used in the fabrication industry for manufacturing various products such as cabinets, shelves, furniture, and other metal products.

6. Electrical: GI sheets are used for manufacturing electrical enclosure panels due to their durability, strength, and corrosion resistance.

7. Agriculture: GI sheets are used in agriculture for building poultry sheds, greenhouses, and storage units.

Overall, GI sheets offer a reliable and cost-effective solution for many applications and are widely used in numerous industries and sectors.