1. Raw material preparation
The raw material of galvanized steel coils is ordinary steel coils, which are processed into flat plates of the required size after shearing, polishing, leveling, slitting and other processes. In this process, the key steps are of course shearing and slitting. Do you think it is critical to ensure the dimensional accuracy of the steel coil and the flatness of the sheared edges?
2. Surface treatment
Before galvanizing, the steel coil needs to be surface treated. First, the surface of the steel coil is pickled with hydrochloric acid or sulfuric acid to remove surface rust and dirt. Then, rinse with clean water and blow dry with compressed air. The purpose of this is to ensure that the galvanized layer can adhere tightly to the steel surface, thereby improving the anti-corrosion effect.
3. Hot dip galvanizing
Hot-dip galvanizing is an important part of galvanized steel coil processing. The treated steel coil is placed in a galvanizing tank, and the zinc layer melted at high temperature covers the surface of the steel to form a zinc alloy layer. This process needs to be carried out at high temperature, generally the temperature is controlled between 450-500°C. At the same time, the thickness of the zinc layer needs to be controlled to achieve better anti-corrosion effect.
4. Cooling and passivation
Hot-dip galvanized steel coils need to be cooled and passivated. Cooling can use water cooling or air cooling, with the purpose of cooling the steel coil quickly so as not to affect the structure and performance of the zinc layer. Passivation is to enhance the corrosion resistance of the zinc layer, and chromate passivation is generally used for surface treatment.
5. Rewinding and packaging
The steel coils after the above treatment can be rolled up and packaged. The galvanized steel coils are collected using a winding machine and then packaged. When packaging, it is necessary to ensure that the steel coil is not scratched or contaminated, and at the same time, the product label must be clear and accurate.
6. Quality inspection
During the processing of galvanized steel coils, quality inspection is required. The inspection content includes dimensional accuracy, surface quality, zinc layer thickness, etc. These detection indicators directly affect the quality and anti-corrosion effect of galvanized steel coils. Only products that meet the standards can be sold out of the factory.
