The production process of galvalume steel coil is complex and precise, taking high-quality cold-rolled steel coil as the base material, after degreasing, annealing and other pretreatment processes, entering the molten 55% Al-Zn alloy bath for continuous hot-dip coating. The control of furnace temperature, belt speed, air knife pressure and other parameters directly determines the coating thickness, uniformity and surface quality. The annealing process can eliminate the internal stress of the steel strip, improve the plasticity and toughness, and ensure that the product is not easy to crack during bending and stamping. The air knife system uses high-pressure gas to scrape off excess molten alloy, accurately control the coating weight, and ensure the consistency of each part of the coil. Compared with galvanized steel coil, galvalume steel coil has a denser coating structure, which can form a stable oxide film on the surface to block the invasion of corrosive media such as water vapor and acid rain. In coastal areas with high salt spray content, the service life of galvalume steel coil roof panels can reach more than 20 years, while ordinary galvanized products need to be replaced in about 5-8 years. This product is not only used in the construction industry, but also widely used in household appliances, automotive, agricultural machinery and other fields. In the household appliance industry, it is used to make shells of ovens, air conditioners, water heaters, etc., with good heat resistance and corrosion resistance, keeping the appearance intact for a long time. In the automotive industry, it is used in exhaust pipes, heat shields and other components, adapting to high-temperature and corrosive working environments. Tianjin Gaosteel Group has 15 production lines and an annual output of more than 650,000 tons, which can provide galvalume steel coil products with different thicknesses, widths and strength grades. The product conforms to international standards such as ASTM A792 and AS1397, and is sold to more than 50 countries and regions. The professional R&D team and experienced engineers optimize the production process to ensure that each coil of galvalume steel has stable performance and reliable quality.
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