Galvalume steel coil, also known as 55% Al-Zn alloy coated steel coil, is a high-performance corrosion-resistant metal product produced by continuous hot-dip coating process. Its coating composition is 55% aluminum, 43.5% zinc and 1.5% silicon, which combines the long-term corrosion resistance of aluminum and the electrochemical protection of zinc. Silicon element can stabilize the coating structure, avoid excessive alloy layer growth, and ensure the uniformity and adhesion of the coating. This product has 2-5 times the corrosion resistance of traditional hot-dip galvanized steel coil in atmospheric, industrial and marine environments. In rural atmospheric environment, the corrosion rate of galvalume steel coil is only 1.3g/m² per year, while that of galvanized steel is 4g/m²; in heavy industrial and coastal environments, the corrosion rate gap is more obvious. It has excellent heat resistance, can withstand long-term use at 490℃ without obvious oxidation and discoloration, and has high thermal reflectivity, with a reflectivity of more than 0.75, which is twice that of galvanized steel. It is widely used in building roof panels, wall panels, garage doors, ventilation pipes and other fields, effectively reducing building energy consumption. In addition, galvalume steel coil has good forming, welding and coating adhesion, suitable for cutting, bending, stamping and other deep processing. It can be used as the base material of color coated steel coil, and the coating is not easy to fall off during processing. Tianjin Gaosteel Group controls the coating weight, thickness tolerance and mechanical properties of galvalume steel coil through advanced production lines and strict quality inspection. The common coating grades are AZ100, AZ150, AZ180, etc., which can meet the needs of different corrosion environments. The product has a smooth surface and regular spangle, with high decorative performance. It is suitable for outdoor buildings and household appliances shells that require both beauty and durability. For construction projects in coastal areas, chemical plants and other harsh environments, galvalume steel coil can greatly extend the service life of components, reduce maintenance and replacement costs, and has a high cost-performance ratio.
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