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<p>A coupled computational model of molten steel within the mold was developed, encompassing electromagnetic fields, fluid flow, heat transfer, shell formation, stress, and strain. The model was verified through comparison with plant measurements, showing reasonable agreement in electromagnetic field distribution, solidification endpoint, and shell thickness. Results indicate that coordinating the submerged entry nozzle (SEN) and mold electromagnetic stirring (M-EMS) effectively regulates the solidification quality of the initial shell. Adjusting M-EMS current frequency changes the impact position of the molten steel jet from the four-port SEN, while increasing current intensity reduces the jet impact intensity. Adjusting the M-EMS parameters can enhance the initial shell uniformity. Furthermore, in areas directly impacted by the steel jet from the four-port SEN, a relationship between brittle temperature range (BTR) width and total mechanical strain was found, and the larger the BTR width, the smaller the corresponding total mechanical strain. The BTR width provides a discriminant method to avoid hot tearing. Appropriate M-EMS parameters are obtained and applied, and the plant trials show a significant improvement in hot tearing near the surface of round blooms.</p>

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Optimizing mold electromagnetic stirring parameters for coordinated control of initial shell solidification quality in large round blooms under four-port submerged entry nozzle for feeding

  • 期刊论文

  • 发表日期：

    2025年2月25日

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  • Tao Wang,
  • Chang-jun Xu,
  • Chong Lei,
  • Lu-hao Ren,
  • Wen Wang,
  • Hong-lin Guo

摘要

A coupled computational model of molten steel within the mold was developed, encompassing electromagnetic fields, fluid flow, heat transfer, shell formation, stress, and strain. The model was verified through comparison with plant measurements, showing reasonable agreement in electromagnetic field distribution, solidification endpoint, and shell thickness. Results indicate that coordinating the submerged entry nozzle (SEN) and mold electromagnetic stirring (M-EMS) effectively regulates the solidification quality of the initial shell. Adjusting M-EMS current frequency changes the impact position of the molten steel jet from the four-port SEN, while increasing current intensity reduces the jet impact intensity. Adjusting the M-EMS parameters can enhance the initial shell uniformity. Furthermore, in areas directly impacted by the steel jet from the four-port SEN, a relationship between brittle temperature range (BTR) width and total mechanical strain was found, and the larger the BTR width, the smaller the corresponding total mechanical strain. The BTR width provides a discriminant method to avoid hot tearing. Appropriate M-EMS parameters are obtained and applied, and the plant trials show a significant improvement in hot tearing near the surface of round blooms.