Hot Dipped Galvanized Steel Coil
In the 21st century, steel products will remain the most critical irreplaceable structural and functional material with the most significant output and the most comprehensive coverage in human society. The pace of structural adjustment of the world's metallurgical industry is accelerating, and the production focus will shift from developed countries to developing countries. At present, our country is in the process of industrialization. The continuous and rapid development of various sectors of the national economy and industrial upgrading has put forward higher requirements on the variety and quality of steel products. Therefore, speeding up the structural adjustment of my country's metallurgical industry will be of great significance.
There is still a gap in the development of hot-dip galvanizing of strip steel in my country compared with the world level. Most of the existing hot-dip galvanizing production lines in my country have disadvantages: backward technology, high zinc consumption, low product output, poor product quality, high production costs, high energy consumption, inadequate environmental protection measures, and often cause severe environmental pollution. Such production lines cannot meet the requirements of my country. The needs of the national economy to take off. A small number of large state-owned steel companies can produce high-quality hot-dip galvanized sheets for home appliances and automobiles. Most of the continuous hot-dip galvanizing technology for large-scale steel sheets in my country introduce from the United States, Japan, and Europe at a considerable cost. It is at a general level, with many similar levels and repeatability. , Many mature technologies. There are many available products and similar products, few high-tech, new and cutting-edge technologies, few high-tech products, and fewer independently developed technologies. The core technology cannot be fully mastered, and there is no ability to develop and produce new varieties.
On the other hand, my country's self-developed hot-dip galvanizing process and technology conversion rate are low, and it isn't easy to form an industry. Low integration of immature and imperfect system technology results is the crux of engineering and industrialization. These problems are mainly because the production technology and equipment development capabilities of hot-dip galvanized steel sheets for high-performance automobiles in my country lag behind the world's advanced level. Therefore, developing the production technology and equipment high-performance automobile hot-dip galvanized steel sheet is indispensable. Strengthen the system integration of results, promote the transformation and application of results, gradually increase the self-sufficiency rate of my country's high-performance hot-dip galvanized automotive sheet products, and promote the progress and development of technology in this field in my country. The large-scale modern continuous hot-dip galvanizing steel plate unit in my country is imported from different countries such as the United States, Japan, Europe, etc. Although its products are relatively similar, the production technology has its characteristics. Application and innovation are significant work in surface coating technology. This move will accelerate the shortening gap between my country and foreign countries, reduce repeated introductions, and realize the system integration of high-performance hot-dip galvanized steel technology and equipment scientific research results. Realize the transformation and application of results, and push our technology to the world.
The domestic production technology and equipment of hot-dip galvanized steel sheets for high-performance automobiles currently mainly rely on introducing advanced foreign technologies. Only Baosteel has conducted some product-specific research on the production and development of automobile sheets and other imports for high-performance automobiles. As a result, the enterprises of the hot-dip galvanized sheet production line is just pure production and use, failing to digest and absorb fundamentally and effectively develop and use innovations. As the earliest domestic research unit to enter the field of continuous hot-dip galvanizing of steel strips, the Central Iron and Steel Research Institute assisted WISCO in introducing and digesting the first domestic hot-dip galvanizing unit in the 1970s. During the subsequent "Seventh Five-Year Plan" and "Eighth Five-Year Plan" period, the Central Iron and Steel Research Institute completed the development and scientific research of Galfan and Galvalume alloy coatings. The Central Iron and Steel Research Institute subsequently carried out the localization of continuous hot-dip coating equipment for steel strips and coordinated with relevant domestic units to complete the localization of essential equipment such as air knives, welders, sunken rolls (used by Galvalume), and gas purification devices. In recent years, the Central Iron and Steel Research Institute has always adhered to the combination of advancement in scientific research and development in these fields and has successfully developed a regenerative reduction annealing furnace with a combustion efficiency of more than 70%; developed and promoted continuous hot-dip galvanizing of wideband steel. The alloy coating technology is designed to complete the regenerative folding reduction annealing furnace and designed and developed a medium current density electrolytic degreasing technology, closely tracking the ZAM series products with the highest corrosion resistance currently abroad and completing the pilot test.
The Central Iron and Steel Research Institute has a 100mm wide experimental unit on which GF, GL, and hot-dip Al-Si alloy coatings successfully develop. In addition, the Central Iron and Steel Research Institute currently has complete laboratory conditions for experimental testing of various hot-dip galvanized products.
At present, the development of hot-dip galvanized sheet technology and equipment for high-performance automobiles is still relatively weak in China. The central domestic units involved in this field are major steel enterprise technology centers, and some universities are also conducting experimental or testing purposes. Scientific research activities.
