Color-coated steel coils-also known as pre-painted steel coils-are composite materials produced by applying organic coatings to a steel strip substrate (following degreasing and phosphating treatments) and subsequently baking it. These materials combine the mechanical strength of steel with the decorative appeal and corrosion resistance of organic coatings, making them widely used in sectors such as construction, home appliances, and packaging.
Available coating types include polyester (PE), silicone-modified polyester (SMP), and polyvinylidene fluoride (PVDF). Depending on their intended application, these products are categorized into groups such as construction materials, home appliances, and packaging-with home appliance applications demanding the highest technical standards.
The substrates typically consist of hot-dip galvanized steel, electro-galvanized steel, or aluminum sheets. Cold-embossing techniques are often employed to enhance the material's three-dimensional texture, while the stability and environmental friendliness of pretreatment solutions are optimized to improve corrosion resistance. The production process involves steps such as roller coating and baking. Coating technology is currently evolving toward greater functionality (e.g., anti-fouling and heat-absorbing properties) and improved environmental sustainability, with production equipment increasingly becoming automated. Available product specifications include types such as the 760–970 series. Installation methods typically involve the use of rivets or self-tapping screws, complemented by accessories such as ridge caps and door/window trim components. Currently, the domestic industry faces challenges such as a limited variety of available substrates and a reliance on imported high-end coatings; future development is focused on the application of high-precision substrates and the wider adoption of cold-embossing processes.