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Hot Dip Galvanized Steel Coil is produced by passing Cold-Rolled Steel Coil through a Molten bath of Zinc at temperatures of around 460 degrees Celsius.It involves cleaning steel and immersing it in molten zinc to obtain a coating. Hot dip galvanizing is the process of coating iron or steel with a layer of zinc by immersing the metal in a bath of molten zinc at a temperature of around 450 °C (842 °F).Through this process, the coils are coated with zinc liquid only (Z),or zinc and aluminum (AZ) or zinc, aluminum and magnesium (ZAM) .
1. Pay-off reel : Two pay -off reels to unwind cold-rolled coil.
2. Welder : Tail end of coil to be welded to the head end of the succeed coil.
3. Pre-Cleaning : The strip is degreased to remove oil and dirt from strip.
4. Entry looper : Strip is accumulated for continuous running at center section in case of entry section is stopped for welding.
Center section:
5. Cleaning : Electrolytic cleaning and pickling process to remove oil and iron oxide film on the steel surface before plating.
6. Plating cell : Strip is coated with zinc by electrolytic process.Coating weight is controlled by quantity of electricity.
7. Chemical treatment : Phosphate film is chemically coated on the plated zinc as pre-treatment before painting at customer. Chromating is no more produced since the end of 2006.
8. Resin coating : Product V2 and VN (special resin) are resin coated at coater unit and baked at oven until before cooling at cooling unit.
9. Oven : Coated resin film is baked by induction heater unit.
10. Cooling : Baked strip is cooled down by air cooling system.
11. Delivery looper : Accumulate strip for continuous running at center section in case of delivery section is stopped.
