Dissolution Behavior of Mg from Magnesia-Chromite Refractory into Al-killed Molten Steel
- Tohoku University, Department of Metallurgy, Graduate School of Engineering (Japan)
- Tohoku University, Institute of Multidisciplinary Research for Advanced Materials (Japan)
- Chosun Unversity, Department of Materials Science & Engineering, College of Engineering (Korea, Republic of)
- University of Science and Technology Beijing, School of Metallurgical and Ecological Engineering (China)
Magnesia-chromite refractory materials are widely employed in steel production, and are considered a potential MgO source for the generation of MgO·Al{sub 2}O{sub 3} 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 Al{sub 2}O{sub 3} 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 Al{sub 2}O{sub 3} because the Mg content of the steel melts was low, approximately 1 ppm. On the surface of the magnesia-chromite refractory, an MgO·Al{sub 2}O{sub 3} spinel layer with a variable composition was formed, and the thickness of the MgO·Al{sub 2}O{sub 3} 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·Al{sub 2}O{sub 3} spinel. The MgO content decreased along the thickness direction of the layer, and at the steel melts interface, the formed layer consisted of Al{sub 2}O{sub 3}-saturated MgO·Al{sub 2}O{sub 3} spinel. Therefore, the low content of Mg in steel melts and the unchanged inclusions were because of the equilibrium between Al{sub 2}O{sub 3}-saturated MgO·Al{sub 2}O{sub 3} layer and Al{sub 2}O{sub 3}. 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.
- OSTI ID:
- 22857872
- Journal Information:
- Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science Journal Issue: 5 Vol. 49; ISSN 1073-5615; ISSN MTBSEO
- Country of Publication:
- United States
- Language:
- English
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