Application Development and Challenge on High Strength Steel for Automobile Body

Li Jun1, Liu Xin2, Cao Guangxiang1, Zhang Linyang1

（1. Material and Lightweight Technology Research Institute, China FAW Co., Ltd., Changchun 130011;

2. Ulsan Factory of FAW Co., Ltd., Changchun, 130011） Abstract：based on the statistics of the body materials of the Eurocarbody, the paper analyzes the application status and trend of materials such as steel, aluminum, and plastic in auto body. The analysis results show that high strength steel, especially multi-material composite applications are the development trend of auto body materials in the future. High strength steel is developing towards higher product of strength and elongation and better cost performance, among which the amount of hot formed steel in car body will gradually increase. With the development of high strength steel, its application is also facing a series of challenges, such as cracking and springback of cold stamping, welding technology problems, scientific evaluation of delayed cracking, optimization of fracture toughness, which needs to be overcome through continuous research and investigation. Key words: Lightweight, High strength steel, Delayed cracking, Fracture toughness