Manufacturing Process

Galvanized coils are produced on a continuous hot-dip galvanizing line (CGL). The cold-rolled substrate is cleaned in an alkaline solution, rinsed, and annealed in a reduction furnace at 750–850°C under a H₂-N₂ atmosphere to restore ductility. It is then cooled and immersed in a molten zinc bath at 460±5°C. As the strip exits, air knives (nitrogen) precisely control coating thickness (e.g., Z60 to Z350). The coated strip is cooled and may undergo additional treatments like skin passing, tension leveling, or chemical passivation. Coating adhesion and uniformity are verified via bend tests and salt spray testing.