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

Chunyang Liu, Motoki Yagi, Xu Gao, Sunjoong Kim, Fuxiang Huang, Shigeru Ueda, Shin ya Kitamura

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2298-2307
Number of pages10
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume49
Issue number5
DOIs
Publication statusPublished - 2018 Oct 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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