Hyundai Steel Applies 1.8Giga-Class Ultra-High-Strength Hot Stamping Steel Sheet in Mass Production for the First Time Worldwide
Automotive high-strength hot stamping parts produced at Hyundai Steel Yesan Plant
View original image[Asia Economy Reporter Donghoon Jeong] Hyundai Steel, in collaboration with Hyundai Kia Namyang Research Center's Basic Materials Research Center, has developed a 1.8GPa (gigapascal) premium hot stamping steel and succeeded in mass production for the first time in the world.
According to Hyundai Steel, the company is supplying the new steel grade to Hyundai Motor's next-generation electric vehicles, the Genesis Electrified G80 (G80EV) and the new G90. Initial supply to Hyundai Motor began last year, and from this year, 145,000 sheets will be supplied annually. This amount is sufficient for about 30,000 electric vehicles.
The 1.8GPa ultra-high-strength hot stamping steel not only reduces vehicle weight but also ensures passenger safety during automobile collisions. It improves tensile strength by 20% compared to the existing 1.5GPa hot stamping steel and enables approximately 10% weight reduction in parts manufacturing.
The typical hot stamping process involves heating steel sheets in a furnace at temperatures above 900 degrees Celsius, placing them into molds, and rapidly cooling them to produce parts. Hyundai Steel and Hyundai Kia Namyang Research Center's Basic Materials Research Center developed a specialized process that lowers the furnace temperature by more than 50℃ compared to the conventional method and applied it to parts production.
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Additionally, this process prevents hydrogen penetration into the steel sheets, thereby avoiding internal cracks. This improvement enhances weldability and produces steel sheets that are also resistant to corrosion. Furthermore, by lowering the temperature, the energy consumption required for production was reduced. This not only ensures steel sheet quality but also establishes an environmentally friendly production system.
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