The Role of Niobium in Lightweight Vehicle Construction


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Modern vehicle bodies make intensive use of high strength steel grades to improve the weight and the mechanical performance simultaneously. A broad range of medium and extra high strength steel grades is available. These steel grades have different characteristics concerning strength, formability and weldability. For many steel grades microalloying by niobium is the key to achieve their characteristic property profile. In HSLA steels niobium enhances the strength primarily by grain refinement. In interstitial free high strength steels niobium serves as a stabilizing element and also assists in obtaining the bake hardening effect. Some modern multiphase steels rely on niobium to achieve additional strength via grain refinement and precipitation hardening. Microstructural control provides a way to further optimize properties relevant to automotive processing such as cutting, forming and welding. The relevance of niobium microalloying in that respect will be outlined.



Materials Science Forum (Volumes 537-538)

Edited by:

J. Gyulai and P.J. Szabó




H. Mohrbacher and C. Klinkenberg, "The Role of Niobium in Lightweight Vehicle Construction", Materials Science Forum, Vols. 537-538, pp. 679-686, 2007

Online since:

February 2007




[1] W. Müschenborn, L. Meyer: Thyssen Tech. Ber., 1 (1974), 22.

[2] W. Bleck, W. Müschenborn and L. Meyer: Steel Research 59, 344.

[3] W. Haensch and C. Klinkenberg, Proc. 2nd Int. Conf. On Thermomechanical Rolling, Liège (2004), 115.

[4] N. Balliger and T. Gladman: Metal Science, March (1981), 95.

[5] C. Lancillotto and F. Pickering: Metal Science, Vol. 16, (1982), 371.

[6] O. Maid, W. Dahl, C. Straßburger, W. Müschenborn: Stahl u. Eisen Nr. 8 (1988), 355.

[7] K. Olsson: Processing, Microstructure and Properties of HSLA Steels, TMS (1988), 331.

[8] J. S. Rege, T. Inazumi, T. Urabe, G. Smith, B. Zuidema, S. Denner, Proc. of the 44 st Mechanical Working and Steel Processing Conf., (2002), 391.

[9] T. Heller, A. Nuss: Proc. 2nd Int. Conf. On Thermomechanical Rolling, Liège (2004), 85.

[10] H. Guyon and U. Heidtmann: Symp. Proc. on Processing State-of-the -Art Multi-Phase Steels, Automotive Circle International, Berlin (2004), 27.

[11] K. Hulka, W. Bleck, and K. Papamantelos: Proc. of the 41 st Mechanical Working and Steel Processing Conference, (1999), 67.

[12] M. Takahashi: Nippon Steel Technical Report, 88 (2003), 2.

[13] Najafi-Zadeh, S. Yue and J.J. Jonas, ISIJ Intern. 32 (1992), 213.

[14] L. Meyer, W. Bleck and W. Müschenborn, Physical Metallurgy of IF Steels, ISIJ, (1994), 203.

[15] L. Storojeva, C. Escher, R. Bode and K. Hulka: Proc. of IF Steels 2003, IJSI (2003), 294.

[16] T. Urabe Y. Ono, H. Matsuda, A. Yoshitake and Y. Hosoya: Proc. of IF Steels 2003, IJSI (2003), 170.