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<p>The corrosion behavior of MgO–MgO·Al<sub>2</sub>O<sub>3</sub> refractories by molten high Mn steel (5, 15, and 25 wt pct Mn) and its vapor was investigated. The results show that the Mn in the molten high Mn steel preferentially vaporizes due to the relatively higher vapor pressure, and reacts with the MgO in the surface layer of the refractories to form the Mg–Mn solid solution. The participation of Al vapor in the reaction promotes the transformation of the reaction layer into the Mn–Al spinel phase. The characteristics of interface reaction layer is dominated by the synergistic effect of vapor corrosion and interfacial reaction. Al in the steel preferentially reacts with MgO in the firstly formed Mg–Mn solid solution to form the spinel phase. The reaction layer cannot prevent the continuous infiltration of Mn vapor along the pores of the refractories, triggering to deep corrosion. Furthermore, the main inclusions in high Mn steel are (Mn, Al)O–MnS and AlN–MnS complex inclusions. The increase in Mn content in the steel leads to the decrease in the number of inclusions due to the low oxygen potential in liquid steel and formation of the dense interface layer. The longer reaction time also contributes to the regular decrease in the number of oxide inclusions due to the sufficient time for inclusion flotation.</p>

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Corrosion Behavior of MgO–MgO·Al2O3 Refractories in High-Mn Steels Considering Element Vaporization

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Jianzhen Zhai,
  • Guangqiang Li,
  • Siwei Ai,
  • Yijiang Zhao,
  • Wen Yan,
  • Ao Huang,
  • Yu Liu

摘要

The corrosion behavior of MgO–MgO·Al2O3 refractories by molten high Mn steel (5, 15, and 25 wt pct Mn) and its vapor was investigated. The results show that the Mn in the molten high Mn steel preferentially vaporizes due to the relatively higher vapor pressure, and reacts with the MgO in the surface layer of the refractories to form the Mg–Mn solid solution. The participation of Al vapor in the reaction promotes the transformation of the reaction layer into the Mn–Al spinel phase. The characteristics of interface reaction layer is dominated by the synergistic effect of vapor corrosion and interfacial reaction. Al in the steel preferentially reacts with MgO in the firstly formed Mg–Mn solid solution to form the spinel phase. The reaction layer cannot prevent the continuous infiltration of Mn vapor along the pores of the refractories, triggering to deep corrosion. Furthermore, the main inclusions in high Mn steel are (Mn, Al)O–MnS and AlN–MnS complex inclusions. The increase in Mn content in the steel leads to the decrease in the number of inclusions due to the low oxygen potential in liquid steel and formation of the dense interface layer. The longer reaction time also contributes to the regular decrease in the number of oxide inclusions due to the sufficient time for inclusion flotation.