Home > Products > Galvanized Products > Galvanized Steel Coil/sheet

Products

GI Coil

Thickness: 0.12mm – 6.0mm
Width: 600mm – 1500mm
Zinc Coating: 30 – 600 g/m²
Surface Treatment: Coated
Manufacturing Process: Hot-rolled
Coil Inner Diameter: 508mm / 610mm
Length: Customizable according to customer requirements
Standard Specifications: 0.12 – 6.0mm × 1500mm, etc.

Send Inquiry

Description

What is a GI Coil?

GI coil, which stands for Galvanized Iron coil, is a type of steel coil that has been coated with a protective layer of zinc through a process called galvanization. This process involves submerging the steel coil into a molten bath of zinc, typically at a temperature around 450 °C. As the steel makes contact with the molten zinc, a fascinating metallurgical reaction occurs, resulting in the formation of a zinc - iron alloy layer on the steel's surface. This zinc coating serves as a robust shield, safeguarding the steel from the perils of corrosion and rust, and significantly extending the material's lifespan.

Production Process of GI Coil

The production of our GI coils is a highly precise and carefully orchestrated process. We start with top - quality cold - rolled steel sheets as the base material. These sheets are then put through a series of rigorous cleaning procedures to eliminate any impurities, ensuring a pristine surface for the zinc coating to adhere to. Next, the clean steel sheets are continuously immersed in our state - of - the - art molten zinc bath. At our factory, we have advanced technology that allows us to precisely control the thickness of the zinc coating according to the specific needs of our customers' end - use applications. Once the galvanization is complete, our skilled workers carefully coil the coated steel sheets into GI coils, which are then ready for further processing or distribution to our valued clients.

Properties of GI Coil

Exceptional Corrosion Resistance

One of the most outstanding features of our GI coils is their remarkable corrosion resistance. Zinc, being more reactive than iron, acts as a sacrificial anode. In the presence of moisture and air, the zinc will corrode in place of the underlying steel. This makes our GI coils an ideal choice for applications where exposure to the elements is inevitable, such as in outdoor construction projects. Whether it's a building in a coastal area facing salty sea air or a structure in a humid climate, our GI coils will stand the test of time.

Superior Formability

Our GI coils retain the excellent formability of the original steel. They can be easily bent, punched, cut, and welded, enabling manufacturers to shape them into a wide variety of components for different applications. Whether you're forming roofing sheets, automotive parts, or industrial enclosures, the formability of our GI coils allows for the creation of complex shapes with relative ease.

Excellent Coating Adhesion

The alloyed zinc - iron layer formed during the galvanization process in our factory provides outstanding adhesion for further coatings. This means that if additional protection or decorative finishes are required, such as painting or applying a polymer coating, our GI coils can readily accept these coatings, enhancing their overall performance and aesthetic appeal.

Applications of GI Coil

Construction Industry

Our GI coils are extremely popular in the construction industry. They are a top choice for roofing and wall cladding materials. The corrosion - resistant property ensures that buildings are protected from the elements for long periods. In addition, they are used for making gutters, downspouts, and suspended ceilings. For example, in a large - scale commercial building project, our GI coil - made roofing sheets can provide a durable and cost - effective roofing solution.

Automotive Industry

In the automotive sector, our GI coils are used for manufacturing various components. Vehicle bodies, chassis parts, and interior panels often utilize our GI coils. The combination of corrosion resistance and formability makes them suitable for creating parts that need to withstand the rigors of daily use and different environmental conditions.

Appliance Manufacturing

Household appliances like refrigerators, washing machines, and ovens also benefit from our GI coils. The steel provides a sturdy base, while the zinc coating protects against rust, ensuring the longevity of these appliances. For instance, the outer shells of refrigerators made from our GI coils not only look sleek but also resist corrosion over time.

Advantages of GI Coil

Exceptional Corrosion Resistance

One of the most significant and well - known advantages of GI Coil is its remarkable corrosion resistance. Through the galvanization process, a layer of zinc is bonded to the surface of the iron coil. Zinc acts as a sacrificial anode, meaning it corrodes in place of the underlying steel when exposed to moisture and air. This protective mechanism makes GI Coil an ideal choice for outdoor applications, such as roofing, fencing, and outdoor structural elements. For example, in coastal regions where the salty air can quickly degrade unprotected metals, GI Coil - made structures can endure for decades with minimal maintenance, significantly reducing the need for frequent replacements and repairs.

Cost - Effectiveness

In terms of cost, GI Coil offers excellent value. While the initial purchase price may be slightly higher than some uncoated steel products, its long lifespan and low maintenance requirements more than offset the upfront cost. Because it resists rust and corrosion so well, the need for costly anti - corrosion treatments or replacements due to degradation is minimized. This makes it a cost - effective option for large - scale projects, such as industrial buildings, where the durability and longevity provided by GI Coil can lead to substantial savings over the project's lifetime.

High Formability

GI Coil retains the formability of the base steel, allowing it to be easily shaped, bent, cut, and welded. This property gives manufacturers the flexibility to create a wide range of products, from complex automotive parts to simple household appliances. For instance, in the automotive industry, GI Coil can be formed into body panels that require precise shapes and contours, while still maintaining its structural integrity and corrosion - resistant properties. This formability also simplifies the manufacturing process, reducing production time and costs.

Versatile Applications

Thanks to its unique combination of properties, GI Coil finds applications in a diverse array of industries. In the construction industry, it's used for roofing, wall cladding, and structural supports. In the appliance manufacturing sector, it serves as the material for the outer shells of refrigerators, washing machines, and other household items. It's also utilized in infrastructure projects for items like lamp posts, railings, and signage. This versatility makes GI Coil a popular choice for businesses that need a reliable material across multiple product lines or projects.

Disadvantages of GI Coil

Limited Temperature Resistance

While GI Coil excels in protecting against corrosion, it has limitations when it comes to temperature resistance. Prolonged exposure to high temperatures can cause the zinc coating to degrade, reducing its effectiveness as a protective layer. In applications where the material will be exposed to extreme heat, such as in certain industrial furnaces or high - temperature manufacturing processes, alternative materials may be more suitable. If used inappropriately in high - temperature environments, the lifespan of GI Coil can be significantly shortened, leading to premature replacement and additional costs.