The first continuous hot-dip galvanized steel strip production line was established in the United States in 1937, and the first continuous electro-galvanized steel strip production line was built in the United States in 1942. It has been in industrial production for more than 70 years.
Hot-dip galvanized products are widely used in construction, household appliances, vehicles and ships, container manufacturing, electromechanical industry, etc., and almost involve all fields of clothing, food, housing and transportation. In recent years, the world's demand for galvanized steel sheets has been increasing, and the output has also increased rapidly. In the major steel producing countries such as the United States and Japan, the proportion of hot-dip galvanized steel sheets in steel has reached as high as 13% -15%.
Recently, the automotive industry has paid more and more attention to the service life of materials, and the use of painted cold-rolled steel plates has been unable to meet the requirements of corrosion resistance. Under such circumstances, hot-dip galvanized sheets with excellent corrosion resistance and low cost began to be generally favored by automobile manufacturers.
The biggest advantages of coated steel sheets are excellent corrosion resistance, paintability, decoration and good formability. In recent years, the amount of coated steel sheets used in automobiles has been on the rise, and has become the main body of automotive thin plates. Countries around the world are studying how to expand the variety and specifications of coated plates, improve the coating process and thus improve the quality of the coating, that is, corrosion resistance, anti-powder peeling, coating and welding. The formability of the coated plate is always an important aspect of its application, which mainly depends on the performance of the substrate, the coating process and performance and the forming process conditions. Only through the integration of advanced technologies can good application results be achieved.
