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Development of a New Bake-Hardenable Galvannealed Sheet Steel for Automotive Exposed Panels
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Abstract
Various types of bake-hardenable steels have been developed and applied to automotive body panels for a weight reduction since 1981. Recently for the improvement in the cosmetic corrosion resistance of the exposed panels, an ultra-low carbon bake-hardenable galvannealed steel was developed and has been produced in a large quantity. The main metallurgical features of the ultra-low carbon bake-hardenable steel are follows,
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(1)
adjustment of bake-hardenability by controlling the total carbon content between 15 and 25 wt.ppm,
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(2)
suppression of TiC formation by controlling Ti content between 48/14 ·N and 48·(N/14+S/32).
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(3)
optimisation of temper rolling condition to eliminate the stretcher strain.
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Authors
- Takashi Tanioku - Sumitomo Metal Industries, Ltd., Wakayama Steel Work Wakayama, Japan
- Yoshihiko Hoboh - Sumitomo Metal Industries, Ltd., Wakayama Steel Work Wakayama, Japan
- Atsuki Okamoto - Sumitomo Metal Industries, Ltd., Research and Development Division Amagasaki, Japan
- Naomitsu Mizui - Sumitomo Metal Industries, Ltd., Research and Development Division Amagasaki, Japan
Topic
Citation
Tanioku, T., Hoboh, Y., Okamoto, A., and Mizui, N., "Development of a New Bake-Hardenable Galvannealed Sheet Steel for Automotive Exposed Panels," SAE Technical Paper 910293, 1991, https://doi.org/10.4271/910293.Also In
References
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- Matsuoka T. Okamoto A. Sugisawa S. Nakai S. HSLA Steels: Metallurgy and applications Gray J.M. et al. 1985 969
- Okamoto A. Takahashi M. Hino T. Trans. I.S.I. Jpn 21 1981 802
- Okamoto A. Takeuchi K. Takagi M. Sumitomo Search 39 Sept. 1989 183
- Okamoto A. Mizui N. Tetsu-to-Hagane 76 1990 422
- Okamoto A. Mizui N. Proceedings of TMS symposium on Metallurgy of Vacuum-Degassed Sheet Products Indianapolis Oct. 3-5 1989
- Irie T. Satoh S. Yasuda A. Hashimoto 0. Metallurgy of Continuous-annealed Sheet Steel 1983 155