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.