Hot-dip galvanized steel coil is a steel product produced by passing cold-rolled steel strip through a continuous annealing furnace and then immersing it in molten zinc, forming a protective zinc coating that physically isolates the steel from corrosive media while also providing sacrificial anode protection, significantly improving corrosion resistance compared to ordinary cold-rolled sheets. It is widely used in building roofing and wall panels, home appliance casings, automotive components, and light industrial manufacturing, making it one of the most widely consumed coated steel sheet products today.