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Everything About Galvanized Steel Coil

Author: Doreen Gao

Aug. 24, 2022

60 0

Tags: Hardware

About the Galvanized steel coil, we have to know that the steel of it is a carbon flat steel product with a zinc coating on the surface. This coating improves the corrosion resistance of steel coils or sheets.


How it is Made

Galvanized Steel Coil

Galvanized Steel Coil


The most commonly used method for galvanized steel coil is the hot-dip galvanizing process.

In the hot-dip galvanizing process, the carbon steel coil is immersed in an acid bath to remove the steel scale. Once the steel is cleaned and the scale is removed, it is continuously immersed in the molten zinc bath to form a metallurgical bond and protective coating with a controlled coating weight. The weight of the coating increases the corrosion resistance of the steel.

The zinc bath in the hot-dip galvanizing process contains trace elements such as aluminum. The presence of these traces optimizes coating adhesion and improves the ductility of galvanized steel, galvanized steel coils and galvanized steel slit coils, enabling the material to form hundreds of products that we use every day.

In previous steel making generations, galvanized steel coil used to contain large, flowery crystalline patterns of zinc on the surface of the steel known as "spangle". Spangle resembles large hexagonal snowflakes. Although today's galvanized steel still contains spangle, modern steel mills produce galvanized steel with spangle that is virtually undetectable to the naked eye. This is known as minimum spangle and zero spangle galvanized steel.



Hot Dipped Galvanized Steel Coils

Among the most popular varieties of galvanized steel sold in coils is the fact that which can be hot-dipped. This essentially implies there will be a zinc layer on the outside in the sheets of metal. It will act as a barrier, separating the steel which happens to be galvanized through the outer elements. This will make it much more durable than standard corrugated steel sheets. Essentially, it is actually placed into a molten bath of pure zinc, ultimately causing chemical changes that can make it considerably more durable. 


How Can This Method Work?

This method, also referred to as HDG, is starting to become far more common. Dipping fabricated steel in the large vat of zinc that is certainly molten is a fast procedure that will guarantee that it will probably be very durable. It is actually advantageous over other types of corrugated steel simply because of its anti-corrosion properties. Even if you have galvanized steel, it will help it become much more durable and proof against the cold and warm weather. What you must realise would be that the galvanizing process, just like it is, can be improved upon by using the hot dip process using zinc.


Is That This Different From The Galvanizing Process?

Hot dip galvanizing is slightly distinct from the cold galvanizing process. The main difference is visible within the final product. You will notice a distinct sharp and smooth finish on the exterior of galvanized steel. However, any one of these metals which are dipped into zinc will have a much more rough appearance. That is because of methods zinc at this temperature will connect with the steel on the outside. This is the way you will be aware which you have paid extra for a more durable product that has the main benefit of an outer layer of zinc. Although it may cost more for this particular process to happen, you can expect to end up paying less during the period of time for every single project that you just complete.


Will This Stay Longer Than Galvanized Steel Products?

Generally, materials that can be simply galvanized will last a minimum of 30 years. Incorporating zinc on the outside, along with the metallurgical procedure that will occur, will allow it to last many extra decades. As long as it reaches a temperature of 450°C, you will end up with a very clean finish on the outside in the metal. It's also possible to get similar results having a zinc iron alloy instead.

the Galvanized Steel Coil

Galvanized Steel Coil

The Principle of the Galvanization Protection

Galvanized steel is able to prevent surface of steel sheet from suffering the corrosion, lengthens its available time. The reason are the following:

1. Zinc coating can prevent corrosive substances such as acid (such as acid rain) from contacting the underlying metal.

2. Galvanizing treatment can prevent rust. When the coating is scratched, zinc is still more likely to "lost anode" than base metals, thereby protecting it from rust.

3. Zinc protects metals by corroding faster than alkaline metals. For example, a special ingredient called "chromate" is added to galvanized metal, which makes it corrode faster. The reason for this is to corrode the zinc coating first to protect the underlying metal from corrosion.


The Benefits

1. Super protection: galvanized steel coil can prevent corrosion on the surface of the steel plate and prolong its usable time. Every inch of galvanized steel coil is protected, even the sharp edges and hard-to-reach cracks.

2. Low maintenance: The steel that lacks protective coating needs more maintenance to keep the appearance and structure of the product safe.

3. Economically: The initial choice of galvanized steel coil may seem more expensive, but in the long run, it is a huge investment. In addition, galvanizing is actually cheaper than many other protective steel coatings.

4.Long durability: The life expectancy of the galvanized steel coating can reach 50 years, and it can withstand the exposure of cities and coastal areas.



Galvanized steel coil are mainly applies in some professions, such as constructions.

For the constructions, it mainly used as roofs of some industrial, residential constructions to preventing from corrosion.

For the light industry, it used to produce outer cover of electrical appliances, chimney, kitchen utensil and corrosion-proved parts of automobiles.

And it is also used as storage and transport in farming, animal husbandry, fishery area.

Best Hardware is a manufacturing enterprise which specializes in steel coil, nails, wear, mesh, window screening, etc. If you want to learn more about our products, welcome to consult!



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