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Calcium Transfer to Oxide Inclusions in Al-Killed Steel Without Calcium Treatment

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Abstract

Alumina inclusions generated from aluminum deoxidation may undergo several transformations depending on steelmaking conditions. Under reducing conditions, in contact with MgO-saturated slag, alumina inclusions are known to transform to spinel. However, there are uncertainties related to CaO pick-up by alumina-based inclusions. This work aims to provide some clarification of CaO pick-up by alumina inclusions through a series of experiments. First, the role of silicon in calcium transfer from slag was examined by conducting two similar experiments: one without any silicon addition and a second with 1 wt pct electronic grade silicon addition. Second, the role of crucibles was tested by conducting experiments in ZrO2 and CaO-3 pct ZrO2 crucibles. It was found that the addition of silicon significantly enhances the rate of CaO pick-up when there was no silica in the slag at the start of reaction. The effect of the crucible on CaO pick-up was found to be weaker than that of the 1 wt pct silicon addition.

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Acknowledgments

The authors acknowledge support from the member companies of the Center for Iron and Steelmaking Research and use of the Materials Characterization Facility at Carnegie Mellon, supported by Grant MCF-677785.

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Authors and Affiliations

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

    Deepoo Kumar & Petrus Christiaan Pistorius

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  1. Deepoo Kumar
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  2. Petrus Christiaan Pistorius
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Correspondence to Petrus Christiaan Pistorius.

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Manuscript submitted 24 August 2020; accepted 09 October 2020.

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Kumar, D., Pistorius, P.C. Calcium Transfer to Oxide Inclusions in Al-Killed Steel Without Calcium Treatment. Metall Mater Trans B 52, 163–177 (2021). https://doi.org/10.1007/s11663-020-02004-6

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  • DOI: https://doi.org/10.1007/s11663-020-02004-6

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