The quality of the color corrugated steel sheet is much more uniform, more stable, and more desirable than the single-piece spraying or brushing of the molded metal surface. The color coated steel sheet has excellent decorative property, moldability, corrosion resistance, strong coating adhesion, and can maintain a novel color for a long time.
According to the experience of the international color plate in the past 50 years, when the weather resistance index is 1000h, the acid fog resistance index is greater than 500h, and the color plate service life is about 25 years. Because the color corrugated steel sheet has the advantages of both the steel plate and the organic material, both the mechanical strength and the easy forming property of the steel plate, and the good decorative and corrosion resistance of the organic material can be obtained, and the steel can be used for wood and high-efficiency construction. It is an ideal composite material for various industries such as construction, transportation, light industry, home appliances, and electromechanical products, which saves energy and prevents pollution caused by secondary processing.
How to choose color corrugated steel sheet?
For the selection of color-coated corrugated roofing sheets, color corrugated steel sheets of different substrates or different coating types should be selected according to the environment and application. In different regions and different parts of use, the use of the same galvanizing amount, the same coating, the same coating thickness of the color corrugated steel board, its service life will be very different.
For example, in industrial areas or coastal areas, due to the action of sulfur dioxide gas or salt in the air, the corrosion rate is accelerated and the service life is affected. In the rainy season, the coating is wetted by rain for a long time, or the temperature difference between day and night is too large to be dew condensation. The parts will be corroded faster and the service life will be reduced.
For the external use of buildings, the hot dip galvanized steel coil with excellent corrosion resistance should be selected as the substrate, and the galvanizing amount of the hot-dip galvanized steel sheet should be required (the new national standard for color corrugated steel sheets is considering this aspect). Provisions). The coating weight of the hot-dip galvanized steel sheet is proportional to the corrosion-resistant life and has a high requirement of 180 g/m2 (double-sided) or more. When the gloss retention and color retention performance is required to be 10 to 20 years, the polyvinylidene fluoride coating should be selected for the selection of the coating. When used as a corrugated board in construction, it is best to use a color corrugated steel sheet produced by the 2 coat 2 baking process on the upper and lower surfaces. When making the sandwich panel, the upper surface can be selected as 2 coats, the lower surface. It is a color corrugated steel sheet coated once.