Brief introduction of cold-rolled steel strip and coating technology for packaging steel strip

Brief introduction of cold-rolled steel strip and coating technology for packaging steel strip
　　Cold-rolled strip and its coated products are widely used in construction, automobiles, home appliances, transportation and other industries, especially the coated plate is still maintaining a strong growth momentum. Its technological development is mainly manifested in:
　　 (1) The combination of pickling and cold rolling can increase the yield rate by 1%-3%, increase the hourly output by 30%-50%, reduce the intermediate warehouse by 5000-10000m2, and reduce the roll consumption by 40%-50%. Reduced production costs and construction investment;
　　 (2) Continuous annealing, the product has high quality, good shape, smooth surface and uniform performance, which can increase the yield rate of 1%-3%, diversified steel types, and save energy by more than 20%. The production cycle is shortened from 10 days. Within 1 day, the equipment occupies a small area;
　　 (3) Full-hydrogen bell-type annealing, which is twice as efficient as traditional bell-type furnaces. The product has good deep drawability and smooth surface. It is especially suitable for the production of cold-rolled coils with small batches and many varieties;
　　 (4) The shape control technology has been greatly developed, and hydraulic roll bending, process lubrication and cooling, and closed-loop control are commonly used, and a number of new rolling mills that can effectively control the shape of the plate have been developed;
　　 (5) Hot-dip galvanized, hot-dip galvanized aluminum and zinc-iron alloy, electro-galvanized, electro-galvanized nickel, fingerprint-resistant sheet, organic coating sheet, vibration-damping board, electro-tin, low-nickel tin-plating, electro-chromium, hot There have been great developments in the production technology of lead-plated and hot-dipped lead-tin coatings.