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<p>The degradation behavior of an MgO–19&#xa0;pct C purging plug was studied by pure O<sub>2</sub> gas blowing in contact with initial 0.5, 0.9, 1.9, and 4.0 pct C liquid steels using a high-frequency induction furnace for 20 min at 1550&#xa0;°C. X-ray CT revealed distinct degradation behaviors at the gas/refractory interface (GRI) and the liquid steel/refractory interface (LRI). At the GRI, the MgO–C was more severely degraded than at the LRI. At the GRI, a reaction layer was formed in all specimens, whereas at the LRI, it was formed only in the case of the initial 0.5 pct C liquid steel. Based on FE-SEM/EDS analysis, the reaction layers formed at both interfaces were found to be (Mg,Fe)O(ss) reaction layer, which can be formed through the reactions of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{Fe}}\left(\text{s,l}\right)\text{ + }\frac{1}{{2}}{\text{O}}_{2}\left({\text{g}}\right)\text{ + MgO}\left({\text{s}}\right)\text{ = }\left(\text{Mg,Fe}\right){\text{O}}\left({\text{ss}}\right)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>Fe</mtext> <mfenced close=")" open="("> <mtext>s,l</mtext> </mfenced> <mspace width="0.333333em" /> <mtext>+</mtext> <mspace width="0.333333em" /> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <msub> <mtext>O</mtext> <mn>2</mn> </msub> <mfenced close=")" open="("> <mtext>g</mtext> </mfenced> <mspace width="0.333333em" /> <mtext>+ MgO</mtext> <mfenced close=")" open="("> <mtext>s</mtext> </mfenced> <mspace width="0.333333em" /> <mtext>=</mtext> <mspace width="0.333333em" /> <mfenced close=")" open="("> <mtext>Mg,Fe</mtext> </mfenced> <mtext>O</mtext> <mfenced close=")" open="("> <mtext>ss</mtext> </mfenced> </mrow> </math></EquationSource> </InlineEquation> at the GRI and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\text{Fe}}\left({\text{l}}\right)\text{ + }\underline{\text{O}}\text{ + MgO}\left({\text{s}}\right)\text{ = }\left(\text{Mg,Fe}\right){\text{O}}\left({\text{ss}}\right)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>Fe</mtext> <mfenced close=")" open="("> <mtext>l</mtext> </mfenced> <mspace width="0.333333em" /> <mtext>+</mtext> <mspace width="0.333333em" /> <munder> <mtext>O</mtext> <mo>̲</mo> </munder> <mspace width="0.333333em" /> <mtext>+ MgO</mtext> <mfenced close=")" open="("> <mtext>s</mtext> </mfenced> <mspace width="0.333333em" /> <mtext>=</mtext> <mspace width="0.333333em" /> <mfenced close=")" open="("> <mtext>Mg,Fe</mtext> </mfenced> <mtext>O</mtext> <mfenced close=")" open="("> <mtext>ss</mtext> </mfenced> </mrow> </math></EquationSource> </InlineEquation> at the LRI. Meanwhile, the carbon content in liquid steel decreased linearly to about 0.09 pct C and then non-linearly and slowly decreased to about 0.03 pct C. It can be thought that the (Mg,Fe)O(ss) reaction layer may be formed from about 15 min of the experiment (0.04 pct C, 0.17 pct O).</p>

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Degradation Behavior of MgO–C Purging Plug by O2 Blowing in Contact with Liquid Steels

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Jaewoo Myung,
  • Giwon Kim,
  • Changeun Park,
  • Yongsug Chung

摘要

The degradation behavior of an MgO–19 pct C purging plug was studied by pure O2 gas blowing in contact with initial 0.5, 0.9, 1.9, and 4.0 pct C liquid steels using a high-frequency induction furnace for 20 min at 1550 °C. X-ray CT revealed distinct degradation behaviors at the gas/refractory interface (GRI) and the liquid steel/refractory interface (LRI). At the GRI, the MgO–C was more severely degraded than at the LRI. At the GRI, a reaction layer was formed in all specimens, whereas at the LRI, it was formed only in the case of the initial 0.5 pct C liquid steel. Based on FE-SEM/EDS analysis, the reaction layers formed at both interfaces were found to be (Mg,Fe)O(ss) reaction layer, which can be formed through the reactions of \({\text{Fe}}\left(\text{s,l}\right)\text{ + }\frac{1}{{2}}{\text{O}}_{2}\left({\text{g}}\right)\text{ + MgO}\left({\text{s}}\right)\text{ = }\left(\text{Mg,Fe}\right){\text{O}}\left({\text{ss}}\right)\) Fe s,l + 1 2 O 2 g + MgO s = Mg,Fe O ss at the GRI and \({\text{Fe}}\left({\text{l}}\right)\text{ + }\underline{\text{O}}\text{ + MgO}\left({\text{s}}\right)\text{ = }\left(\text{Mg,Fe}\right){\text{O}}\left({\text{ss}}\right)\) Fe l + O ̲ + MgO s = Mg,Fe O ss at the LRI. Meanwhile, the carbon content in liquid steel decreased linearly to about 0.09 pct C and then non-linearly and slowly decreased to about 0.03 pct C. It can be thought that the (Mg,Fe)O(ss) reaction layer may be formed from about 15 min of the experiment (0.04 pct C, 0.17 pct O).