Production Process of Galvanized Coil

The following describes the main production process of galvanized sheet
1. Unwinding and welding
The prepainted galvanized steel coil in stock is unwound, and the steel coil required for continuous operation is provided. The winding end of the preceding coil and the coil of the subsequent coil are welded to ensure continuous production of the unit.
2. Skim cleaning
The cleaning section is to clean the surface of the galvanized steel coil to remove rolling oil and iron powder to obtain good coating adhesion and surface quality, generally including spraying, brushing, electrolytic cleaning, brushing, spraying, squeezing and hot air drying. Such equipment, cleaning section is more important for hot-dip galvanizing is an important step to obtain the good surface quality of coiled steel.
3. Annealing
The re-crystallization annealing of the rolled coil steel is carried out to obtain good mechanical properties of the product. By controlling the atmosphere in the furnace to obtain good properties of the coil coating, the annealing furnace is generally preheated, heated, soaked, cooled, etc. Segment composition.
4. Air knife zinc layer control
The thickness of the coating on the surface of the hot sale galvanized steel coil is controlled by blowing a gas, typically air or pure nitrogen, onto the surface of the coil after the zinc pot.
5. Alloying treatment
The alloying treatment is a process of heating the pre-painted galvanized steel coil to obtain a zinc-iron alloy coating layer.
6. Leveling and pulling the correction
Rolling steel with small rolling force, eliminating the yield platform of low carbon steel, improving the performance of coil steel, obtaining the desired surface roughness of galvanized steel coil, improving the shape of coiled steel sheet, and obtaining good flatness. After the flattening is the tension correction, the tension correction is the stretching and straightening of the galvanized steel coil, the most important is to obtain a good plate type.
7. Post processing
Passivation or other chemical surface treatment of the prepainted galvanized steel coil in stock to obtain the corrosion resistance, lubrication or other requirements desired by the user, generally by spray squeezing or roller coating drying.
8. Trimming
Cut the coil as needed to obtain the proper width accuracy.
9. Oiling
Oiling the pre-painted galvanized steel coil to obtain certain rust and lubrication properties.