Color steel coil, namely the industry referred to as the color coated steel coil, the use of cutting-edge composite technology will steel and colorful and rich peritoneum highly integrated into one, both good performance of a variety of materials, greatly improve the chemical stability of the material, with more effective anti-rust and anti-corrosion performance. Color steel not only has the excellent quality of steel in flexibility, plasticity, pressure resistance, wear resistance, heat dissipation and high temperature resistance, but also very outstanding in color, finish, feel and other aspects. It is worth mentioning that all raw materials used in color steel production are pollution-free and pollution-free environmental protection materials, and the production process is completely dust-free. Both production and later use have extremely high environmental protection characteristics. Color steel materials are divided into five categories: packaging, home appliances, building materials, optical materials and decorative materials. Among them, home appliances color steel material technology is the best and the most fine, the highest production requirements. Color steel coil substrate classification: 1, cold rolled substrate, with the processing properties of cold rolled plate; However, any small scratches on the surface coating will expose the cold rolled substrate to the air, so that the dew iron will quickly form red rust. 2, galvanized substrate, now the main method of galvanized steel plate surface is hot dip galvanizing. Hot dip galvanizing is developed from the older hot dip plating method, characterized by smooth appearance, no zinc nob, burr, thickness are controllable, within 5-107μm arbitrary selection, no hydrogen embrittance, no temperature harm, can ensure the mechanical properties of the material unchanged, good corrosion resistance, neutral salt spray test up to 240 hours. Building color steel coil is generally hot-dip galvanized steel plate and hot-dip aluminum zinc steel plate as the base plate, mainly processed into corrugated board or with polyurethane composite sandwich board, used for the construction of steel structure plant, airport, warehouse, refrigeration and other industrial and commercial buildings roof, wall, door. Home appliance color board is generally based on galvanized and cold plate, used for the production of refrigerators and large air conditioning systems, freezers, toasters, furniture and so on. Transportation industry generally galvanized and cold plate as the substrate, mainly used for oil sump, automotive interior parts.