How Galvanized Steel Coil is Manufactured - Manufacturing Processes
Galvanized steel coils are steel products that have been treated with a protective coating to prevent corrosion. The coating consists mainly of zinc, which forms a barrier between the steel substrate and the corrosive environment. This process not only improves the life of the steel but also gives it an attractive appearance.
Components of galvanized steel coils
The main component of galvanized steel coils is, of course, steel. However, the decisive feature is the zinc coating that encapsulates the steel substrate. This zinc layer acts as a sacrificial barrier, which corrodes instead of the steel when it is exposed to corrosive elements. In addition, the thickness of the zinc coating may vary, thus affecting the level of corrosion protection provided.
Manufacturing Process:
1. Surface Preparation:
The whole journey begins with the preparation of the steel substrate. The raw steel coil undergoes a thorough cleaning process to remove any surface contaminants such as rust, oil or dirt. This preparation ensures optimum adhesion of the galvanized layer applied in the subsequent steps.
2. Galvanizing bath:
After cleaning, the steel coil is immersed in a molten zinc bath. This step is called hot dip galvanizing and is the key to the process. The zinc bath is kept at a high temperature to ensure a proper metallurgical bond between the zinc and the steel. This metallurgical bond enhances the durability and longevity of the resulting galvanized steel.
3. Alloying and Solidification:
When the steel coil is removed from the galvanizing bath, excess molten zinc drips off, leaving a layer of zinc adhering to the surface of the steel. At this stage, alloying between the zinc and steel may occur, further enhancing the bond between the two materials. The zinc layer solidifies on the steel substrate to form a protective coating.
4. Cooling and Inspection:
The galvanized steel coil is then cooled to allow the zinc coating to fully solidify and bond to the steel. After cooling, the coils are thoroughly inspected to ensure the uniformity of the coating thickness and its adhesion to the steel. This inspection is essential to ensure that the final product meets the required quality standards.
5. Post-treatment (optional):
Depending on the intended application and desired properties, galvanized steel coils may undergo additional treatments. A common post-treatment is passivation, which involves applying a chemical solution to the zinc coating to enhance its corrosion resistance. In addition, topcoats may be applied for aesthetic purposes or to provide additional protection against specific environmental factors.
Galvanized steel coil production is to put the steel plate into a fusible zinc pot and coat some zinc on its surface.
Continuous galvanizing is its main production process. It refers to putting steel soil into a fusible zinc pot.
Alloy galvanized steel panels are also made by hot-dip galvanizing. But when it comes out of the zinc pot, the temperature has risen to 500 degrees, and an alloy film is produced.
It has the advantages of adhesion and weldability.
We can produce galvanized sheets, galvalume sheets, color-coated sheets, color-coated aluminum coils and corrugated sheets.
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