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Dissolution Behavior of Mg from Magnesia-Chromite Refractory into Al-killed Molten Steel

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Abstract

Magnesia-chromite refractory materials are widely employed in steel production, and are considered a potential MgO source for the generation of MgO·Al2O3 spinel inclusions in steel melts. In this study, a square magnesia-chromite refractory rod was immersed into molten steel of various compositions held in an Al2O3 crucibles. As the immersion time was extended, Mg and Cr gradually dissolved from the magnesia-chromite refractory, and the Mg and Cr contents of the steel melts increased. However, it was found that the inclusions in the steel melts remained as almost pure Al2O3 because the Mg content of the steel melts was low, approximately 1 ppm. On the surface of the magnesia-chromite refractory, an MgO·Al2O3 spinel layer with a variable composition was formed, and the thickness of the MgO·Al2O3 spinel layer increased with the immersion time and the Al content of the steel melts. At the rod interface, the formed layer consisted of MgO-saturated MgO·Al2O3 spinel. The MgO content decreased along the thickness direction of the layer, and at the steel melts interface, the formed layer consisted of Al2O3-saturated MgO·Al2O3 spinel. Therefore, the low content of Mg in steel melts and the unchanged inclusions were because of the equilibrium between Al2O3-saturated MgO·Al2O3 layer and Al2O3. In addition, the effects of the Al and Cr contents of the steel melts on the dissolution of Mg from the magnesia-chromite refractory are insignificant.

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Acknowledgments

The authors thank Professor Xinhua Wang of the Shougang Corporation (previously at the University of Science and Technology, Beijing) for his kind support in the P-SEM analysis. The authors appreciate the Kurosaki-Harima Corporation for supplying the magnesia-chromite refractory rod. The authors gratefully acknowledge the financial support provided by the Iron & Steel Institute of Japan (ISIJ) research promotion Grant.

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Authors and Affiliations

  1. Department of Metallurgy, Graduate School of Engineering, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    Chunyang Liu & Motoki Yagi

  2. Central Japan Railway, 1-1-4 Meieki, Nakamura-ku, Nagoya, Aichi, 450-6101, Japan

    Motoki Yagi

  3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    Xu Gao, Shigeru Ueda & Shin-ya Kitamura

  4. Department of Materials Science & Engineering, College of Engineering, Chosun Unversity, 309, Pilmun-daero, Dong-gu, Gwangju, 61452, Korea

    Sun-Joong Kim

  5. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing City, 100083, China

    Fuxiang Huang

  6. Steelmaking plant of Beijing Shougang Co., Ltd., Qian-an City, Hebei Province, China

    Fuxiang Huang

Authors
  1. Chunyang Liu
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  2. Motoki Yagi
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  3. Xu Gao
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  5. Fuxiang Huang
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Corresponding author

Correspondence to Xu Gao.

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Manuscript submitted September 26, 2017.

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Liu, C., Yagi, M., Gao, X. et al. Dissolution Behavior of Mg from Magnesia-Chromite Refractory into Al-killed Molten Steel. Metall Mater Trans B 49, 2298–2307 (2018). https://doi.org/10.1007/s11663-018-1301-0

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  • DOI: https://doi.org/10.1007/s11663-018-1301-0

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