An aluminum coil is a continuous strip of aluminum rolled into a coiled form, typically produced through hot or cold rolling processes. The manufacturing begins with aluminum ingots, which are heated to ~600°C for hot rolling. The ingot passes through a series of rollers to reduce thickness by 40–90%, creating a thick strip. For cold rolling, the hot-rolled coil is further processed at room temperature to achieve precise thickness (as thin as 0.1 mm) and surface finishes.
Key steps include:
Annealing: Heat treatment to enhance ductility.
Slitting: Cutting coils into specific widths.
Coating: Optional protective layers (e.g., PVDF for corrosion resistance).
Aluminum coils are graded by alloy (e.g., 1000–8000 series), temper (O, H12, T6), and thickness tolerance (±0.01 mm for precision applications). The process consumes ~15 kWh/kg of energy, with modern mills achieving 95% material efficiency.
