What Is Galvanized Steel Coil?

Usually, Galvanized steel coil uses hot rolled or cold rolled steel as raw materials, and is manufactured through a hot dip galvanizing process to manufacture. Compared with other steel materials, galvanized steel coil is less expensive, has the benefits of long service life, prevents steel from corrosion, has a wide range of applications, provides comprehensive protection, etc.  For further details, please keep reading.

Galvanized steel coil is the hot-selling product at Wanzhi Steel. Wanzhi Steel is a famous manufacturer and distributor in China. We mainly produce galvanized steel, galvalume steel, prepainted galvanized steel, etc. Moreover, our factory is located in Boxing County, Shandong Province. You are welcome to visit our factory and the galvanized steel production lines.

Specification

Item	Galvanized Steel Coil
Thickness	0.12mm – 6mm
Width	600mm – 1500mm
Coil Weight	3-8 tons
Raw material	Hot rolled or cold rolled steel
Surface Structure	big spangles, small spangles, regular spangles, zero spangles
Zinc Layer Thickness	30g/m2-275g/m2 (Z275/G90)
Standard	AISI, ASTM, BS, GB, JIS
Certificates	SGS, ISO 9001
MOQ	10 tons

Uses

Galvanized steel coil mainly offers anti-corrosion protection for steel. Coating a zinc layer on the steel surface can isolate the touch between steel and the external environment, reduce the occurrence rate of corrosion, and lengthen the service life of steel. Therefore, GI coils are applicable in construction areas, home appliances industries, transportation areas, automobile industry, and so on. There are some application details for your reference.

• In the construction area: Because of its corrosion resistance and anti-fire properties, you can use galvanized coils to produce roofing sheets, shingles, and security windows.
• In the home appliance industry: Galvanized steel coils have been widely applied. Usually, we use it to manufacture the shell and internal parts of refrigerators, washing machines, microwave ovens, printers, and other household appliances.
• In the automobile area: Our coils can be used to process automobile bodies, doors, roofs, and other parts, as well as automobile shells, exhaust pipes, oil tanks, etc
• In the transportation area: owing to its high strength and excellent corrosion resistance, the galvanised steel coil is often used to make Bridges, highway guardrails, road light poles, and other traffic facilities.

In addition, with the development of industry and construction, galvanized coils are increasingly widely used because of their excellent performance. The demand for galvanized coil has increased.  Specifically, in the construction of highways, urban rail transit construction, oil and gas pipelines, and other significant infrastructure projects.

Types

According to different production processes, GI steel coil can be divided into hot-dip galvanized steel coil and electro-galvanized steel coil.

Hot dip galvanized steel coil

• Hot-dip galvanized steel coils are produced using a high-temperature hot-dip process, immersing the steel sheet in molten zinc at approximately 450℃, resulting in a uniform, relatively thick zinc layer (typically 30-275 g/m²) adhering to the surface.
• Hot-dip galvanized steel coils are widely used in manufacturing, construction, and automotive industries due to their smooth surface, good processability, and excellent corrosion resistance.

Electro-galvanized steel coil

• In a room-temperature electrolyte solution, zinc ions are uniformly deposited onto the steel sheet surface through the action of an electric current, forming a thin and dense zinc layer.
• Electro-galvanized steel coils have a smooth, flat surface, high dimensional accuracy, and a uniform zinc coating distribution, making them suitable for applications such as appliance housings, automotive interior parts, and electronic device housings.

In general, hot dip galvanized steel coil and electro-galvanized steel coil are all our hot-selling products. In some aspects, they have some differences. About zinc thickness, hot dip galvanized steel coil is more thicker. Therefore it is suitable for outside environments. Regarding corrosion resistance, electro galvanized has lower corrosion resistance than hot dip galvanizing.

Moreover, the electro-galvanized production cost is higher. Considering the above factors, you can select a suitable steel coil when you purchase. For further questions, please don’t hesitate to contact us!

GI Steel Coil Manufacturing Process

There are two production processes for galvanized steel coils: hot-dip galvanizing (high-temperature immersion melting, thick zinc layer) and electro-galvanizing (electrochemical deposition, physical adhesion, thin zinc layer).

Galvanized Steel Coil Price

Various factors affect the galvanized steel coil price, such as specification, surface structure, tunnage, etc. Regarding surface structure, we have regular spangles, small spangles, big spangles, and zero spangles, and you can elect it based on your requirements. In different regions and manufacturers, the price is also not the same. To save your costs, we recommend you acquire several factories’ prices and choose the cost-effective supplier. In summary, the price of galvanized coils is influenced by several elements, and the specific price needs to be determined according to specifications, brands, transportation locations, and market demand. If you want to know the latest price about steel materials, welcome feel free to contact us.

Galvanized Coil Manufacturer-Wanzhi Steel

As we all know, the manufacturer is your best option when purchasing galvanized steel coils. A stable manufacturer and supplier will ensure on-time delivery and product quality. Wanzhi Steel Group is a professional manufacturer and distributor in China. As a manufacturer, we have two advanced galvanized steel production lines and steel sliding lines that make galvanized slit coils. Our production plant produces 200,000 tons of galvanized coil annually. Moreover, as a distributor, our galvanized steel coils have been sold to over 100 nations and regions all over the world. We even provided 1000 tons of galvanized coils for government projects. We are looking forward to establishing long-term corporate connections with you, and you are welcome to visit our factory in person.

Besides galvanized steel coils, what other galvanized steel products can we offer?

• Gi Flat Sheets: Flat, fixed-length materials made from galvanized steel coils through uncoiling, shearing, or cross-cutting.
• Galvanized Corrugated Sheets: Roll-formed from galvanized steel coils or flat sheets using a forming machine.
• Galvanized Steel Strips: We have our own slitting equipment to cut galvanized steel coils into galvanized steel strip coils.
• Pre-painted galvanized steel coil: This is a galvanized steel coil coated with a colored organic paint. We have 3 color-coated steel production lines.

FAQ About GI Coil

Q1: Will the “zinc flowers” on galvanized steel coils affect their use?

A: Zinc flowers are the natural crystalline form of zinc crystals, a product of the hot-dip galvanizing process. They do not affect the material’s corrosion resistance or mechanical properties. If you dislike the zinc flower surface, you can choose zero-zinc-flower coating.

Q2: What is the “white rust” on the galvanized layer?

A: White rust is basic zinc carbonate formed in a humid, poorly ventilated environment. It affects the appearance and the stability of the galvanized steel’s performance. For information on preventing white rust, please read this page: https://wzppgi.com/what-is-white-rust-on-galvanized-steel/

Q3: What is the lifespan of galvanized steel coils?

A: The lifespan of galvanized steel coils directly depends on the thickness of the zinc layer and the corrosiveness of the environment. Under normal conditions, such as Z120 GI steel, the lifespan will exceed 20 years. In some industrial or coastal environments, a thicker zinc layer (such as Z275) is needed to ensure a longer lifespan.

Conclusion

As I said, because of its corrosion resistance, durability, and low cost, galvanized coil is widely used in construction, highway guardrails, household appliances, and other industries. Of course, galvanized rolls can also be utilized to make colored-coated steel coil and roofing sheets. Our minimum order quantity is 10 tons. If you want to know the specific production process of galvanized coil, please contact us and we will send you a video or invite you to visit our factory.