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

Dissolution Behavior of Mg from Magnesia-Chromite Refractory into Al-killed Molten Steel Dissolution Behavior of Mg from Magnesia-Chromite Refractory into Al-killed Molten Steel CHUNYANG LIU, MOTOKI YAGI, XU GAO, SUN-JOONG KIM, FUXIANG HUANG, SHIGERU UEDA, and SHIN-YA KITAMURA Magnesia-chromite refractory materials are widely employed in steel production, and are considered a potential MgO source for the generation of MgOÆAl O spinel inclusions in steel 2 3 melts. In this study, a square magnesia-chromite refractory rod was immersed into molten steel of various compositions held in an Al O crucibles. As the immersion time was extended, Mg 2 3 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 O because the Mg content of the steel melts was low, approximately 1 ppm. 2 3 On the surface of the magnesia-chromite refractory, an MgOÆAl O spinel layer with a variable 2 3 composition was formed, and the thickness of the MgOÆAl O spinel layer increased with the 2 3 immersion time and the Al content of the steel melts. At the rod interface, the formed layer consisted of MgO-saturated MgOÆAl O spinel. The MgO content decreased along http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Metallurgical and Materials Transactions B Springer Journals

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

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Publisher
Springer US
Copyright
Copyright © 2018 by The Minerals, Metals & Materials Society and ASM International
Subject
Materials Science; Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology
ISSN
1073-5615
eISSN
1543-1916
D.O.I.
10.1007/s11663-018-1301-0
Publisher site
See Article on Publisher Site

Abstract

Dissolution Behavior of Mg from Magnesia-Chromite Refractory into Al-killed Molten Steel CHUNYANG LIU, MOTOKI YAGI, XU GAO, SUN-JOONG KIM, FUXIANG HUANG, SHIGERU UEDA, and SHIN-YA KITAMURA Magnesia-chromite refractory materials are widely employed in steel production, and are considered a potential MgO source for the generation of MgOÆAl O spinel inclusions in steel 2 3 melts. In this study, a square magnesia-chromite refractory rod was immersed into molten steel of various compositions held in an Al O crucibles. As the immersion time was extended, Mg 2 3 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 O because the Mg content of the steel melts was low, approximately 1 ppm. 2 3 On the surface of the magnesia-chromite refractory, an MgOÆAl O spinel layer with a variable 2 3 composition was formed, and the thickness of the MgOÆAl O spinel layer increased with the 2 3 immersion time and the Al content of the steel melts. At the rod interface, the formed layer consisted of MgO-saturated MgOÆAl O spinel. The MgO content decreased along

Journal

Metallurgical and Materials Transactions BSpringer Journals

Published: Jun 4, 2018

References

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