China's special steel LNBG Group's high-strength cold-formed steel plate for automobiles was successfully rolled out of the high-strength steel production line of the sheet cold rolling mill. It is a major effort by the LNBG Group to successfully break through the production line capacity limitation and successfully develop and achieve industrial trial production, marking LNBG automotive cold Molded products currently have a supply capacity of 1200MPa.
At present, with the increasing demand for lightweight vehicles in the country and the market, major domestic automobile manufacturers and automobile plate production steel companies have been looking for and developing high-quality vehicles that reduce body weight, reduce energy consumption, reduce emissions, and improve occupant safety. New material of strength steel. At present, the main technical directions of the development of high-strength steel plates of domestic and foreign steel companies are concentrated in the fields of cold-formed steel plates and hot-formed steel plates. In recent years, due to the technical difficulty of cold-formed steel and excessive production restrictions, the development of cold-formed steel has been lagging behind that of hot-formed steel. However, as the field of hot forming steel of major domestic steel companies matures, the field of ultra-high strength steel cold forming steel has also become the focus of scientific research of major steel companies. Whether it can achieve a new breakthrough in ultra-high strength steel cold forming steel has become a measure of steel An important symbol of the R & D and manufacturing level of an enterprise.
Faced with fierce market competition, LNBG Group made a major breakthrough in the research and development of new products: After the world premiere of 2000MPa ultra-high strength and toughness hot stamping steel in the hot forming field of Benxi Iron and Steel, LNBG Group accelerated the pace of development and further increased The development of cold forming products represented by martensitic high-strength steel has been greatly enhanced.
It is understood that the research and development and production of high-strength cold-formed steel plates involve many technical problems. During the research and development process, the Automotive Plate Research Institute of Benxi Iron and Steel Technology Institute completed the development of the laboratory after extensive data research and hundreds of experimental simulations In order to make the organizational performance meet the design requirements, the process parameters of industrial trial production were determined. At the same time, as the strength of the steel reaches the design limit of Benxi Steel's equipment, Benxi Steel Research Institute actively communicates and coordinates with relevant departments and units to clarify the composition design, cold-rolled original organization design and final product organization performance control plan to achieve the product The quality is more optimized. As the main production unit, the sheet cold rolling mill has formulated a detailed production plan in advance, and began to check the process parameters and equipment functions before production, especially to repeatedly test the welding process and confirm that it is qualified before production.
In order to ensure that the process parameters of each production process are formulated reasonably and accurately, the technicians of the LNBG Institute of Technology ’s Automobile Sheet Institute work closely with the technicians of the cold plate mill, and use theoretical calculations and data analysis as the basis of the process design through simulation in the laboratory. Trial production, determine the process window of the production site, minimize the occurrence of abnormal problems in the production process, and provide an effective guarantee for the successful trial production of new products. During the industrial trial production, they tracked and tested the product performance, combined with theoretical research to analyze the data organization performance, clarified the alloy composition, cold rolling reduction rate, annealing temperature and other data, and optimized the organization performance to achieve precise control of the original organization. Ensure the quality of the product is stable. In the end, without any reference and reference for successful experience, Benxi Steel Group, after careful planning and careful preparation before trial production, and precise control of key parameters by on-site operators in various processes, overcome many production difficulties and successfully developed Trial production of 1000MPa and 1200MPa grade martensitic steel.
At present, LNBG's highest-strength cold-formed high-strength cold-formed steel sheet for automotive products can meet the requirements of roll forming technology, and is widely used in the preparation of safety structural parts such as automobile thresholds and crash beams. The successful roll-off of high-strength cold-formed steel plate marks LNBG Group's new step in the high-end field of automotive sheet.