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<p>As a core functional refractory in the continuous casting process, the service reliability of the submerged entry nozzle (SEN) is directly related to the stability of continuous casting production, the quality of casting billets, and production efficiency. Al<sub>2</sub>O<sub>3</sub> inclusions clogging constitutes the predominant failure mode of SEN, particularly during continuous casting of high-grade steels. Although several studies in the literature have demonstrated that electric field application can mitigate SEN clogging to some extent, the underlying mechanism remains poorly understood, which hinders its widespread acceptance and practical implementation. The mechanism of preventing SEN clogging by applying a positive electric field was studied, and experimental verification was conducted on it in a certain steel plant. The results indicate that Al<sub>2</sub>O<sub>3</sub> inclusions exhibit a positive charge in molten steel under high-temperature (~1600&#xa0;°C) and low-oxygen-partial-pressure (≤ 20 × 10<sup>–6</sup>) conditions. In the continuous casting process at a Chinese steel plant, applying a positive electric field to the SEN effectively suppressed the migration of Al<sub>2</sub>O<sub>3</sub> inclusions toward the SEN wall, significantly enhancing its clogging resistance.</p>

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Mechanism and experimental verification of clogging prevention in submerged entry nozzles via an external positive electric field

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Qiang Gu,
  • Kai-Wang Chen,
  • Qu Wang,
  • Hong-Xia Li,
  • Guo-Qi Liu,
  • Lei Yuan

摘要

As a core functional refractory in the continuous casting process, the service reliability of the submerged entry nozzle (SEN) is directly related to the stability of continuous casting production, the quality of casting billets, and production efficiency. Al2O3 inclusions clogging constitutes the predominant failure mode of SEN, particularly during continuous casting of high-grade steels. Although several studies in the literature have demonstrated that electric field application can mitigate SEN clogging to some extent, the underlying mechanism remains poorly understood, which hinders its widespread acceptance and practical implementation. The mechanism of preventing SEN clogging by applying a positive electric field was studied, and experimental verification was conducted on it in a certain steel plant. The results indicate that Al2O3 inclusions exhibit a positive charge in molten steel under high-temperature (~1600 °C) and low-oxygen-partial-pressure (≤ 20 × 10–6) conditions. In the continuous casting process at a Chinese steel plant, applying a positive electric field to the SEN effectively suppressed the migration of Al2O3 inclusions toward the SEN wall, significantly enhancing its clogging resistance.