Galvanized steel coil, widely known as GI Coil, refers to a steel sheet that manufacturers coat with a protective layer of zinc. As a result, the zinc layer acts as a powerful shield against rust, moisture, and external damage. Moreover, this process significantly increases the steel’s lifespan and ensures reliability in demanding environments. In addition, galvanized steel coils offer cost efficiency, making them an excellent choice for businesses in need of long-term performance.
The production of galvanized steel coil follows two primary methods:
Hot-dip galvanizing – In this process, manufacturers dip steel sheets into molten zinc at high temperature. Consequently, the zinc strongly adheres to the surface, creating a durable protective layer.
Electro-galvanizing – Here, zinc applies through an electric current. As a result, the coating becomes thinner but more uniform, which is ideal for automotive and precision applications.
After coating, the steel is cooled and rolled into coils. Furthermore, manufacturers can adjust the zinc layer thickness depending on the customer’s needs. Therefore, projects located in coastal areas usually require a thicker zinc coating compared to inland projects.
Galvanized steel coils provide several advantages that distinguish them from regular steel:
Corrosion Resistance – The zinc layer effectively protects the surface even in humid and coastal conditions.
Heat Resistance – The coil remains stable when exposed to high temperatures or UV light.
Machinability – Users can cut, bend, punch, or weld the material while keeping its protective qualities.
Aesthetic Finish – Clients may select bright, matte, or checker finishes based on their project requirements.
Custom Options – Thickness, width, zinc coating weight, and spangle type can all be tailored.
As a result, GI coils provide not only durability but also design flexibility.
Standards: JIS G3302, ASTM A653M, EN 10327, EN 10346, EN 10147, EN 10292.
Grades: DX51D+Z, DX52D+Z, DX53D+Z, S220GD+Z, S250GD+Z, A653M.
Zinc Coating: 20 – 600 g/m² depending on application.
Thickness: 0.14 mm – 6 mm, with custom sizing available.
Width: 1000 mm, 1219 mm, 1250 mm, 1500 mm, or by request.
Surface Finish: Normal spangle, small spangle, zero spangle, bright, or checker plate.
Galvanized coils play an essential role in modern construction. For example, contractors rely on them for roofing sheets, wall panels, window frames, and prefabricated warehouses. Moreover, sandwich panels often use galvanized sheets as their base material.
The automotive sector depends heavily on galvanized coils. Manufacturers produce car body panels, underbody components, and bumpers from GI coils. In addition, both passenger cars and heavy trucks benefit from their strength and rust resistance.
Appliance makers value galvanized steel because it ensures durability and a premium look. Therefore, products such as refrigerators, washing machines, and ovens frequently use GI sheets in their outer shells.
In agricultural projects, galvanized steel proves highly effective. Farmers and contractors use it for greenhouses, barns, silos, and poultry houses. Moreover, its resistance to chemicals and moisture makes it ideal for rural infrastructure.
In coastal and marine industries, GI coils provide unmatched performance. Fishing equipment, boat storage facilities, and industrial containers often rely on galvanized sheets. Consequently, they reduce maintenance costs in harsh salty environments.
The demand for galvanized steel coil continues to rise worldwide. Rapid urbanization, industrialization, and infrastructure development drive this trend, especially in Asia, the Middle East, and Africa. Furthermore, buyers look for reliable partners who deliver consistent quality.
For this reason, suppliers like Basekim play an important role in the global steel market. Because Basekim meets international standards and provides flexible customization, clients trust the company for both domestic and export requirements.
Choosing galvanized steel coil offers multiple benefits:
Durability: Longer service life than cold rolled or hot rolled steel.
Cost Efficiency: Lower replacement and maintenance expenses.
Versatility: Suitable for both indoor and outdoor applications.
Sustainability: 100% recyclable without losing core properties.
Reliable Supply: Available globally in large volumes for international projects.
Therefore, businesses that invest in GI coils secure long-term value and performance.
Galvanized steel coil represents a smart investment for manufacturers, contractors, and engineers. It reduces repair costs, ensures high return on investment, and complies with strict international standards. By working with suppliers such as Basekim, buyers receive guaranteed consistency in coating, thickness, and dimensions. In addition, this partnership ensures reliable supply chains for large-scale projects.
Hot Rolled: Basic steel with rough surface, used for structural applications.
Cold Rolled: Smooth finish with higher strength but prone to rust.
Galvanized: Cold or hot rolled steel with zinc coating for superior corrosion resistance.
Construction, automotive, home appliances, agriculture, and marine industries are the top consumers.
It’s measured in grams per square meter (g/m²). The higher the coating (e.g., 600 g/m²), the better the corrosion resistance.
Yes. GI coils can be painted or laminated for decorative and protective purposes. Painted coils are known as Pre-Painted Galvanized Steel (PPGI).
Common widths include 1000mm, 1219mm, 1250mm, and 1500mm, with thickness ranging from 0.14 mm to 6 mm.