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Galvanized Steel Coil

Product Introduction of Galvalume 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.

Available Specification
Product Name Galvanized Steel coil
Width 600-1500mm or as customer‘s requirements
Thickness 0.12-3mm, or as customer’s requirements
Length As requirements
Zinc coating 20-275g/m2
Surface Light Oil, Unoil,dry, chromate passivated, non-chromate passivated
Material DX51D,SGCC,DX52D,ASTMA653,JISG3302, Q235B-Q355B
Spangle Regular spangle, minimal spangle, zero spangle, big spangle
Coil Weight 3-5 Tons or as customer requirements
Certifications ISO 9001 and SGS
Packing Industry-standard packaging or according to client’s requirement
Brand Baosteel,Ansteel,Shougang
Payment TT, Irrevocable LC at sight, Western union, Ali trade assurance
Delivery time Up 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.

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.


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!


The corrosion resistance of stainless steel coils decreases as the carbon content increases. Therefore, the carbon content of most stainless steels is low, up to 1.2%, and some steels have a low ωC (carbon content) of even less than 0.03% (such as 00Cr12). The main alloying element in stainless steel coil is Cr (chromium). Only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, the goods Cr (chromium) content of at least 10.5%. Stainless steel coil also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements.

Most of the requirements for use are to maintain the original appearance of the building for a long time. In determining which type of goods to choose, the main considerations are the required aesthetic standards, the corrosiveness of the local atmosphere and the cleaning system to be used. However, other applications are increasingly seeking structural integrity or impermeability. Examples include roofs and sidewalls of industrial buildings. In these applications, construction cost to the owner may be more important than aesthetics, and the surface may not be very clean. The use of 304 stainless steel coils in dry interior environments is quite effective.

Weldability. Different product uses have different requirements for weldability. A class of tableware generally does not require weldability, even including some cookware companies. However, most products require raw materials with good weldability, such as second-class tableware, insulation cups, steel pipes, water heaters, water dispensers, etc.


Corrosion resistance. Most stainless steel coil products require good corrosion resistance, such as Class I or Class II tableware, kitchen utensils, water heaters, water dispensers, etc.


Polishing performance. In today’s society, stainless steel coil products in the production process are generally polished, only a few products such as water heaters, drinking fountains, etc. do not need to be polished. Therefore, this requires raw materials with good polishing performance.

1. The need for pre-treatment
Pretreatment is an important treatment step before the surface of stainless steel coil parts enter surface treatment (including pickling, chemical polishing and electrochemical polishing, electroplating, passivation, black coating, coloring, chemical treatment, etc.). During the forming process of goods parts, the surface may adhere to oil stains, burrs, rough surfaces and oxides. Therefore, before surface treatment, oil stains, burrs, uneven surfaces and oxides must be removed in order to obtain subsequent satisfactory results through processing.

2. Treatment of removed dirt

Stainless steel coil surface pretreatment in the need to remove the dirt can be divided into two categories: organic and inorganic substances.

(1) organic dirt. Including mineral oil (such as diesel, oil, paraffin, gypsum, etc.) and animal oil, vegetable oil (such as soybean oil, camellia oil, rapeseed oil, lard, butter, etc.). These oils are mainly from the stainless steel coil zero cattle processing process used in the lubricant. , cutting oil, quenching oil, polishing paste and polishing paste, and fingerprints.

(2) Inorganic dirt. Including dirt, dust particles, oxides and other contaminants generated during the heat treatment process.

3. Pretreatment steps for stainless steel coil parts

(1) The surface is mechanically leveled. Eliminate the roughness of the stainless steel coil surface, through mechanical polishing and grinding to achieve a surface finish.

(2) Degreasing. Remove the surface oil and dirt.

(3) Acid washing. Remove the oxides on the surface.

(4) Weak corrosion. Activates the surface to be treated, removes the surface passivation film, and exposes the metal crystal structure.

Stainless steel is a high-alloy steel, with a large resistance to rolling deformation. In order to carry out high-efficiency and high-precision rolling, rigid rolling mills should be used, generally multi-roller cold rolling mill.


Special welding process is also a feature of cold-rolled stainless steel coil production.


In the production process of cold rolled stainless steel coil, the raw material (hot rolled coil) should be annealed, intermediate annealing should be carried out in the cold rolling process, and the final product should be annealed, so annealing is an important part of the production.


Cold-rolled stainless steel is a high-grade steel products, there are strict requirements for surface quality. Not only are metallurgical defects caused by the previous process not allowed, but also obvious defects caused by the cold rolling process.

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