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Phosphorus-Added, Hot-Rolled, High-Strength Sheet Steel with Low Yield-to-Tensile Strength Ratio
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Abstract
A new hot rolled high strength sheet steel has been developed by utilizing controlled cooling technique after hot rolling to a 0.05wt%C-1.5wt%Mn-0.08wt%P steel. Phosphorus enhances ferrite transformation at higher temperature, which results in a fine dispersion of austenite phase during the cooling step after hot rolling. At lower temperature, P retards austenite decomposition and enhances martensite transformation when the strip is coiled at 250°C or below.
This new high strength steel exhibits low yield-to-tensile strength ratio of 60-70%, while in conventional high strength steels, for example, a 0.15wt%C-1.5wt%Mn steel hot rolled and coiled at 400°C or below after rapid cooling, the yield ratio is about 75%. Besides it exhibits higher ductility, good stretch-flangeability, good fatigue property, good weldability and extremely high bake-hardenability compared to the C-Mn steel. Embrittleness due to segregation of P to grain boundaries was not observed in sheets and welded joints.
This high strength steel has also good paintability and is now under commercial production for wheel discs or chassis components.
Authors
- Toshio Irie - Research Laboratories Kawasaki Steel Corp.
- Toshiyuki Kato - Research Laboratories Kawasaki Steel Corp.
- Akio Tosaka - Research Laboratories Kawasaki Steel Corp.
- Masatoshi Shinozaki - Research Laboratories Kawasaki Steel Corp.
- Koichi Hashiguchi - Research Laboratories Kawasaki Steel Corp.
Topic
Citation
Irie, T., Kato, T., Tosaka, A., Shinozaki, M. et al., "Phosphorus-Added, Hot-Rolled, High-Strength Sheet Steel with Low Yield-to-Tensile Strength Ratio," SAE Technical Paper 850118, 1985, https://doi.org/10.4271/850118.Also In
References
- Formable HSLA and Dual-Phase Steels Davenport A.T. AIME New York, New York 1979
- Structure and Properties of Dual-Phase Steels Kot R.A. Morris J.W. AIME New York, New York 1979
- Fundamentals of Dual-Phase Steals Kot R.A. Bramfitt B.L. AIME New York, New York 1981
- Shinozaki M. Kato T. Irie T. Takahashi I. SAE Paper No. 830032
- Gruzin P.L. Mural V.V. Fiz. Metal, Metalloved 22 1966 159