The automobile and steel industries are closely linked by a strong customer - supplier relationship. The application of high strength sheet originated from social needs. The keen issue for automakers in recent years has been to reduce the weight of the automobile body while maintaining sufficient safety by using high strength steel sheet to ensure both fuel efficiency and crash worthiness. The characteristics of the steel sheets for an automotive body have changed drastically according to changes in demand. In this paper, the exact metallurgical background and mechanical properties of hot rolled steel sheets used for chassis and cold steel sheets used for body are introduced, and the following conclusions were made. Hot rolled steel sheets are applied to the chassis and wheels. Stretch flangeability is an important characteristic as well as El for these applications. Ferrite-bainite steels are widely applied in a range from 490 to 780MPa TS. DP and TRIP-aided steels are strongly enhanced by an excellent El. Cold rolled steel sheets are applied to body panels and structural parts. IF steels occupy the majority of steel sheets in body parts. With the increase in demand for high strength steel sheets, DP and TRIP-aided steel have gained strong interest and are actually applied also as hot rolled sheet steels. Nb is a key element for the production of automotive steels due to various effects. For steels containing low temperature transformation products such as ferrite-bainite steel, DP steel and TRIP-aided steel, Nb works as an element controlling grain size and transformation behavior. For IF steels, Nb works as an element stabilizing interstitial solute C and N.
Nb application to automotive steel sheets
Einsatz von Niob zur Herstellung von Stahlblechen für den Fahrzeugbau
2006
14 Seiten, 19 Bilder, 5 Tabellen, 24 Quellen
Aufsatz (Konferenz)
Englisch
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