Instruction of Galvanized Steel Coil

Galvanized steel coil: a thin steel sheet that is dipped into a molten zinc solution so that a zinc layer is attached to its surface. It is mainly produced by the continuous galvanizing process, in which rolled steel sheets are continuously dipped into a molten zinc bath to make galvanized steel sheets; an alloy galvanized steel coil. This steel sheet is also made by the hot dipping method, but it is heated to about 500°C immediately after coming out of the bath to form a zinc-iron alloy coating. Galvanized steel coils have good coating adhesion and weldability.

Galvanized Steel Coil
Galvanized Steel Coil
Galvanized Steel Coil
Galvanized Steel Coil

Available Specification of Galvanized Steel Coil

Product NameGalvanized Steel coil
Width600-1500mm or as customer‘s requirements
Thickness0.12-3mm, or as customer’s requirements
LengthAs requirements
Zinc coating20-275g/m2
SurfaceLight Oil, Unoil,dry, chromate passivated, non-chromate passivated
MaterialDX51D,SGCC,DX52D,ASTMA653,JISG3302, Q235B-Q355B
SpangleRegular spangle, minimal spangle, zero spangle, big spangle
Coil Weight3-5 Tons or as customer requirements
CertificationsISO 9001 and SGS
PackingIndustry-standard packaging or according to client’s requirement
PaymentTT, Irrevocable LC at sight, Western union, Ali trade assurance
Delivery timeUp to order quantity, contact us to know


Galvanized steel coil products are mainly used in the construction, light industry, automobile, agriculture, animal husbandry and fishery and commercial industries. Among them, the construction industry is mainly used for the manufacture of industrial and civil building anti-corrosion roof panels, roof grilles, etc.; light industry is used for the manufacture of household appliances shells, civil chimneys, kitchen appliances, etc., the automotive industry is mainly used for the manufacture of corrosion-resistant parts of automobiles, etc.; agriculture, animal husbandry and fishery is mainly used for grain storage and transportation, meat, aquatic products refrigeration processing tools, etc.; commerce is mainly used for material storage and transportation, packaging tools, etc.


Why choose galvanized steel coil?

1. Cost-effective solution

Compared to GL or color coated steel coils, galvanized steel coils are the most cost-effective solution, but with similar features such as great corrosion resistance, good appearance, etc.

2. Wide range of applications

Galvanized steel coil can be easily processed into different applications. It is widely used in construction, home appliances, automotive containers, transportation, and other fields.

3. Easy to transport

Compared with GI steel sheets, the coil is easier to transport. In this way, it will save your transportation cost.

What are zinc-free, small square, large square and smooth square galvanized sheets?

1. Zinc-free galvanized sheet

By adding elements that promote angularity to the zinc solution, the zinc layer does not form angularity when it solidifies, and the grains are very fine, smooth and flat, so it is called angularity-free product. It has superior corrosion resistance and good coating performance.

2. Large span galvanized sheet

A spider web accelerating element is added to the zinc solution, so a beautiful spider web is formed when the coating is cured. In the early stage of use, the appearance performance is better, but the grain is coarse and there is fine unevenness.

3. Small square galvanized sheet

 There is no strict definition for small span products. In general, small span products are referred to as small span products. The composition of small spangle products is the same as that of large spangle products. To overcome the poor coating performance of large spangle products, various methods are used to inhibit the growth of spangle during the cooling process, preferably forming a small diameter. spangle has very good coating performance because it does not have a mirror-smooth surface like large spangle, nor is it as smooth as products without spangle.

4. smooth spangle galvanized sheet

Smooth spangle is a galvanized product that is based on no spangle or small spangle and has its surface smoothed again to make it smoother and more suitable for the needs of modern industrial products.

Types of galvanized steel coils

According to the processing method, we classify galvanized steel into the following categories.

1. Hot-dip galvanized steel coils

As the name suggests, hot-dip galvanizing is the process of dipping a washed iron sheet into a molten zinc solution at about 500 degrees to form a zinc layer. This is the most commonly used method. It has some favorable characteristics.

The entire steel surface is evenly covered with zinc layer, even corners, cavities, etc. This gives full protection to the iron sheet.
The cost of hot-dip galvanizing is very low.

2. Electro-galvanized steel coil

Electro-galvanization is a coating of zinc on steel by electroplating with a brine anode and steel conductor. It can improve the corrosion resistance and heat resistance of steel. In addition, it can make the steel more beautiful.

Galvanized Steel Coil
Galvanized Steel Coil (2)

Difference between hot dip galvanized and electro galvanized coils

1. Thickness of zinc layer

Generally speaking, the thickness of the electroplated zinc layer is 5~15μm, while the hot-dip galvanized layer is often over 35μm, or even up to 200μm.

2. Corrosion resistance 

The corrosion resistance of hot-dip galvanized sheets is much better than that of electro-galvanized sheets. This is due to the thickness of the zinc layer and the adhesion between the base metal and the zinc layer.

3. Appearance

The electro-galvanized sheet has a smoother, brighter appearance. Whereas the surface of the hot-dip galvanized coil is rough and dull.

4. Applications

Hot-dip galvanized products are widely used in transportation, construction, communication, electric power, energy, automotive, petrochemical, and home appliance industries. While the electro-galvanized coil is more suitable for small parts, or indoor environments, etc.

Hot dip galvanized coil production process

Cleaning of grease, dirt and paint from the steel coil surface. Steel coils need to be uncoiled and welded for continuous processing.
Rinse off the cleaning solution.
Place in an acidic solution to remove roll scale.
Wash off the pickling solution.
Immerse the steel in the molten zinc solution and hold it for a period of time for galvanizing.
After cooling, the steel is rolled into coils and sold.

Galvanized Steel Coil (3)

Get the latest galvanized steel coil prices

The price of galvanized steel coil mainly depends on the thickness of the coil, the thickness of the zinc layer, etc. When you choose GI steel coil for sale, you need to pay more attention to the quality rather than just the price. Jinan daring metal products has a galvanized steel coil production line, which can produce 10,000 tons of steel coil per month. So we can offer you a fair price. At the same time, we have rich export experience and a multilingual team to save your time and money. Due to the rising material prices, the price of GI plates and coils has been increasing in recent months. Feel free to contact us for the latest price of the GI sheet and coil. Not only that, but we also offer GI sheets for sale. If you are looking for a corrugated sheet or plain galvanized sheet for sale, please contact us today. We are looking forward to your visit.

Reliable Galvanized Steel Coil manufacturer in China

Jinan daring metal products is one of the top galvanized steel coil suppliers in China. We have our own factories and advanced production lines, so we can provide you with high-quality steel coils at reasonable prices. Compared with famous galvanized steel coil manufacturers such as Baosteel and WISCO, Jinan daring metal products offers more competitive prices for the same quality products. Also, there is a wide range of steel products to choose from. For example, we have GI coils available in thicknesses from 0.2 to 4 mm. Also, we offer value-added services such as profiling and cutting. Feel free to contact us for details!


The galvanized steel coil is a profitable investment that can be used in many applications. Jinan daring metal products is a qualified galvanized steel coil manufacturer in China with 17 years of industry experience and 12 years of export experience. During these 20 years, we have developed a complete system from pre-sales consultation to after-sales service. That’s why our products are well received by customers all over the world. In addition to GI coil and sheet sales, we also have PPGI, PPGL, GL steel sheets, and coils and tubes available. Feel free to contact us for more information!

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