After China`s leading high-performance steel material manufacturer successfully developed ultra-high strength and toughness hot stamping forming steel [tensile strength reached 2000 MPa, elongation reached 7% or more, three-point bending angle reached 60 degrees, which was the world`s high-grade strength at that time, and the hot stamping forming steel has passed the verification of General Motors.]
LNBG has also successfully developed non-quenched and tempered ultra-high-strength structural steel hot-rolled coils, which not only have a physical tensile strength of 1200MPa, and become China’s domestic hot-rolled production line with the highest level of production Security is favored by users. The successful development of this type of steel has filled the gap in LNBG's high-strength structural steel field, marking that LNBG's high-strength structural steel products have reached the international advanced level.
In recent years, LNBG has actively promoted the development of leading steel products to the high value-added supply side. In actual work, relying on research and development platforms such as national technology centers, national laboratories, academician expert workstations, postdoctoral workstations, and sheet technology research institutes, we aim at the development trend of the downstream industry chain in multiple fields. Starting from the aspects of advanced technology and reducing production costs, we will vigorously do a good job in the research and development of new products and the improvement and stability of quality. Non-quenched and tempered ultra-high-strength structural steel hot-rolled plates and coils are a concrete manifestation of Bengang Group's aim at the future development trend of the industry, continuously improving high-quality production capacity, and seizing the commanding heights of the industry.
"At the beginning of the research and development of this steel, we have reached a consensus that the development of advanced steel materials will inevitably become the main theme of the development of the steel industry in the future. Advanced ultra-high-strength structural steel materials are among the best and can be widely used. In the fields of construction, construction machinery, and automobiles, the future application prospects are great. To this end, we have done a lot of market research and collected customers’ product requirements and future application information, focusing on the large-scale, lightweight and heavy-duty construction machinery The development requirements have determined the characteristics of lightweight, high strength, and high toughness of the steel, and have been continuously optimized in terms of plate shape control, forming performance, and cost control." Liu Zhipu, director researcher of the Institute of Engineering Structural Steel, Plate Technology Research Institute Introduced in the interview.
In the process of product development, the engineering structural steel R&D team of the Plate Technology Research Institute used nearly 3 years to closely focus on the current LNBG's existing high-strength structural steel practice, collect a large amount of customer application information, and formulate specific characteristics for the use of steel A detailed composition and process design research and development program. After a large amount of data research day and night, hundreds of experimental simulations, inspection and analysis of more than 2,000 samples, the development of the laboratory and the determination of the process parameters of the industrial trial production were finally completed. At the same time, the non-quenched and tempered ultra-high-strength structural steel was successfully rolled at one time on the 2300 production line of the plate hot strip mill, with a yield strength of 1100MPa, a tensile strength of 1200MPa, and good low-temperature impact toughness and cold-formability. At the same time, the non-quenched and tempered ultra-high-strength structural steel adopts low-cost composition design and no quenching and tempering process, which greatly reduces production costs and further enhances the market competitiveness of products.
At present, two steel plates with thicknesses of 4.5mm and 6.5mm produced by LNBG have been trial-produced by different automobile manufacturers, with good results. Among them, the German automobile factory used the steel plate to make the bottom beam of the trailer, instead of the 700MPa grade high-strength steel it originally used, and the weight of the whole vehicle was reduced by 300 kg; the Chinese heavy-duty truck manufacturer used the material to make the dump truck body to reduce the overall weight by about 40%. While achieving light weight, the load capacity of this model is increased, and the service life of the vehicle is prolonged.
In addition, in the review of the 2020 Metallurgical Science and Technology Award, the project "Development and Application of 1200MPa Non-quenched and Tempered High-strength Structural Steel for Commercial Vehicles" declared based on this steel grade won the third prize of the Metallurgical Science and Technology Award.