The development of high strength steels and their application has proceeded aiming at weight reduction and better crash performance. This paper summarizes the requirements and studies the issues relevant to the recent development of a 980 MPa Dual Phase grade, which is being applied to the NISSAN TIIDA. The developed grade not only meets the requirements concerning material characteristics and formability, but also has an improved weldability due to its lower absolute carbon content of less than 0.1% and lower carbon equivalent as compared to conventional grades. Moreover, this alloy is well suited for surface treatments including galvannealing. The application of this new grade is expected to expand from thin to thick gauges, including platform parts. Its application is making progress globally including countries outside Japan. Regarding the property profile, NISSAN believes that DP steel has the best property balance at present. Its further improvement, development, and application within Japanese carmakers as well as the global steel and parts suppliers were studied. In the future, the automotive manufacturing process will advance its revolution in addition to innovations on the material side, e.g, ultra-fine grained steel. Considering this progress, it is clear that material requirements will change. New technologies need to be challenged without restraining conventional common sense.
Material application development for weight reduction of body-in-white
Entwicklung von Werkstoffanwendungen zur Gewichtsreduktion im Karosseriebau
2006
7 Seiten, 6 Bilder, 1 Tabelle, 1 Quelle
Conference paper
English
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