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Effect of Silicon on the Desulfurization of Al-Killed Steels: Part I. Mathematical Model

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Abstract

Recent observations suggest that increased silicon levels improve ladle desulfurization of aluminum-killed steel. While the overall desulfurization reaction of Al-killed steels does not show a direct role of silicon in desulfurization, model calculations are presented which test the idea that silicon suppresses the reduction of silica which can consume aluminum at the slag/metal interface. Consumption of aluminum would increase the oxygen potential at the slag/metal interface and decrease the sulfur partition coefficient between slag and metal. The model considers the coupled reactions of the reduction of silica, iron oxide, and manganese oxide in the slag and desulfurization of the steel by aluminum. The results show that silicon can indeed suppress consumption of aluminum at the slag/metal interface by side reactions other than desulfurization, with silicon affecting both the kinetics and the equilibrium of desulfurization.

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Acknowledgments

The authors are grateful to the industrial members of the Center for Iron and Steelmaking Research for their support of this project, and to Dr David Robertson for helpful suggestions.

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Author notes

  1. Debdutta Roy (Graduate Student, Research Engineer)

    Present address: Saint-Gobain Abrasives, Worcester, MA, USA

Authors and Affiliations

  1. Department of Materials Science & Engineering, Center for Iron and Steelmaking Research, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA, 15213, USA

    Debdutta Roy (Graduate Student, Research Engineer), Petrus Christiaan Pistorius (Professor) & Richard J. Fruehan (US Steel Professor)

Authors
  1. Debdutta Roy
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  2. Petrus Christiaan Pistorius
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  3. Richard J. Fruehan
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Corresponding author

Correspondence to Petrus Christiaan Pistorius.

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Manuscript submitted October 2, 2012.

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Roy, D., Pistorius, P.C. & Fruehan, R.J. Effect of Silicon on the Desulfurization of Al-Killed Steels: Part I. Mathematical Model. Metall Mater Trans B 44, 1086–1094 (2013). https://doi.org/10.1007/s11663-013-9813-0

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  • DOI: https://doi.org/10.1007/s11663-013-9813-0

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