Hot dip galvanized steel coil: The thickness of the galvanized layer is generally between 60-200um. Due to the high galvanizing temperature, the formed galvanized layer is more uniform and stable, thus having a longer service life. Cold galvanized steel coil: The thickness of the galvanized layer is between 5-15um, which is relatively thin. Although it can also provide some anti-corrosion effect, its anti-corrosion ability is weaker compared to hot-dip galvanized steel coils.

Galvanized steel coil refers to a layer of zinc metal coated on a steel plate to achieve anti-corrosion and aesthetic effects. This category usually includes hot-dip galvanized steel coils and cold-dip galvanized steel coils, but when referring to galvanized steel coils, it mostly refers to cold-dip galvanized steel coils. Hot dip galvanized steel coil is a special type of galvanized steel coil, whose galvanizing process involves heating the original steel plate to a certain temperature and immersing it in molten zinc solution for galvanizing treatment. This method forms a thick layer of zinc alloy on the surface of the steel plate.