my country's 8.8～10.9 grade fastener research reaches the international advanced level

The research and development of cold work strengthened non-quenched and tempered steel for grade 8.8～10.9 fasteners includes optimization design of material composition, low temperature controlled rolling, controlled cooling, drawing cold work strengthening and cold working of fasteners, aging treatment and product performance evaluation. The process research and development of cold-work strengthened non-quenched and tempered steel wire rod. The use of non-quenched and tempered steel to produce fasteners can eliminate the annealing process before cold heading, and the quenching and tempering process after forming. It has significant energy saving and environmental protection, economic and social benefits, and supports the development of China's low-carbon economy; successfully Developed cold-work-strengthened non-quenched and tempered steel wire for grade 8.8-10.9 fasteners and its complete industrial production technology, and built the world’s first single-line, multi-channel flexible link high-speed wire demonstration production line; developed the fine-grain pearlite type for the first time ( 8.8, 9.8), granular bainite (10.9) cold work strengthened non-quenched and tempered steel series products and methods of use, through key production process tests such as drawing and aging treatment, safety and environmental protection evaluation and other applied technology research, It has laid a technical foundation for the mature promotion of cold-work strengthened non-quenched and tempered steel in the fastener industry. Its technological innovation results are outstanding, economic and social benefits are notable, and it has a huge promotion effect on the technological progress of the fasteners and metallurgical industries. The two research results have reached the leading domestic and international advanced levels respectively.

Research and industrial application of the technology and industrial application of the utilization of metallurgical zinc-containing dust from rotary hearth furnaces. For the first time in China, the rotary hearth furnace is used in the field of zinc-containing dust in the iron and steel industry. It does not require external carbon and directly uses zinc-containing dust. Production of metallized pellets and coarse zinc powder, etc.; successfully solved the problem of the enrichment hazards of harmful elements in the reduction and recycling process of Maanshan Iron and Steel, and recycled some harmful elements, which is in line with the national energy-saving emission reduction and low-carbon economy guidelines and policies ; This technology and system is the first domestic application, and has played a positive demonstration effect for the deep utilization of zinc-containing solid waste such as gas mud in the domestic metallurgical industry.

The successful application of the new process development project for thin slab production of ultra-low carbon steel in Maanshan Iron and Steel has changed the history of CSP thin slab continuous casting not being able to mass-produce ultra-low carbon series steel grades, and broadened the product structure of thin slab continuous casting , To enhance the competitiveness of thin slab products provides a technical guarantee, and has a good demonstration effect and promotion and application value in domestic thin slab production enterprises.

Research on wheel steels and key technologies for heavy-duty railway trains focuses on the development direction of my country's freight railways, through a series of manufacturing technologies and systems such as alloy design, process optimization, numerical simulation, metal rheology in the rolling process, heat treatment process, etc. Integration and independent development of my country's 25-30 tons of heavy-duty wheels, the physical quality has reached the advanced level of similar products in the world, filled the domestic gap, and has significant economic and social benefits. The research and development, promotion and application of Maanshan Iron u0026 Steel's heavy-duty wheels have improved the level of independent innovation of key steel materials in my country's metallurgical industry, contributed to the realization of China's railway freight heavy-duty transportation and improved railway freight efficiency, and laid the technical foundation for the development of larger axle heavy-duty wheels . Maanshan Iron u0026 Steel's heavy-duty wheels are exported in large quantities, and are widely used in domestic and foreign users, meeting the requirements of heavy-duty railway freight transportation in North America, Australia, Brazil, South Africa, etc., improving the international competitiveness of my country's railway wheel manufacturing industry, and promoting my country's heavy-duty The development of the railway.