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Introduction of Aluminum-zinc Alloy Coated Plates
The coating structure of the galvannealed steel plate is Zn-Al alloy, and the plating composition is 55% Al, 43.3% Zn, and 1.6% Si. This type of steel sheet is gradually replacing galvanized sheets widely used around the world because of its excellent corrosion resistance.
The surface is smooth, has excellent resistance to atmospheric corrosion, and its atmospheric corrosion resistance is 2 to 6 times higher than that of hot-dip galvanized sheet with the same coating thickness. At the same time, it has high-temperature corrosion resistance similar to that of hot-dip aluminum sheet, wholesale GL steel sheet. It can be used for a long time at high temperature up to 315 °C, and it can be used for a long time at temperatures between 500 °C and 600 °C. It has good water and soil corrosion resistance, and its water corrosion resistance is better than that of hot-dip galvanized sheet and hot-dip aluminized sheet. The soil is more corrosive than the hot-dip galvanized sheet; it has excellent coating property and good processing performance, and its processability and weldability are similar to those of hot-dip galvanized sheet, which can be processed by cold bending, stamping, etc., and has a good appearance.
The galvalume steel sheet made in China has the characteristics of the hot-dip galvanized steel plate and the characteristics of hot-dip aluminized steel plate. Therefore, aluminum-zinc alloy coated steel plate can be used in places where a hot-dip galvanized steel plate is used, and the hot-dip aluminum plate can be partially replaced. It has a wide range of applications, such as roofing panels, light steel keels, heating fins, car body, fuel tanks, armored steel strips for cables, skeletons for plastic greenhouses, granaries, shipping containers, household appliances and appliances, and chemical products. The application prospects of the packaging board and the color plate substrate, welded pipe, steel window and cold-formed steel of the metallurgical industry are very broad.
The price of aluminum-zinc alloy coated steel sheet is higher than that of ordinary hot-dip galvanized sheet, but since the specific gravity of metal aluminum is smaller than that of zinc, the specific gravity of aluminum-zinc alloy coating is only 3.75kg/dm3, and the specific gravity of zinc is 7.1kg/dm3, so the coating weight The thickness of the 150 g/m2 (double-sided) aluminum-zinc alloy coating is equal to the coating thickness of the 270 g/m2 (double-sided) hot-dip galvanized steel sheet, which greatly saves the price of the coated metal.
Superior corrosion resistance: The corrosion resistance of the product is 6-8 times that of ordinary galvanized sheets, and it is guaranteed to rust for 20 years in various environments;
High-temperature oxidation resistance: no discoloration or deformation occurs in a high-temperature environment of 315 degrees Celsius;
High heat reflectivity: the product’s thermal reflectivity is higher than 75%, which is twice that of the galvanized sheet;
Easy processing: can meet the processing of stamping, shearing, bending, etc.
Beautiful appearance: silver-white snowflake pattern, beautiful and beautiful, can be used directly without painting.
Surface sprayable: It is a good substrate for paint coating. The composite coating of alloy and organic provides more effective protection against rust under organic coating.