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<p>Nozzle configuration is closely related to spray cooling efficiency, subsequently impacting solidification and heat transfer behaviors of the strand during continuous casting. Understanding these effects is essential for improving slab quality, yet the specific links between nozzle arrangement, cooling/reheating rate distribution, and solidification structure remain unclear. To clarify these relationships, a dendrite growth model was developed based on the prior study, incorporating the influence of spraying water distribution. The relationships between nozzle configuration and the distributions of surface cooling and reheating rates, internal cooling rate, grain size, and solidification front morphology were systematically explored. The results indicate that extending the spraying height enhances the surface thermal uniformity, whereas a wider inter-nozzle distance tends to diminish the uniformity of cooling and reheating rate distributions. In addition, the nozzle configuration and solidification structure evolution collectively determine the cooling rate distribution characteristics within the slab. Specifically, the distribution becomes more uniform under a greater spraying height. In contrast, as the inter-nozzle distance grows, the distribution uniformity initially improves and then declines during the columnar crystal growth and columnar-to-equiaxed transition stages and gradually decreases throughout the equiaxed crystal growth stage. Furthermore, the slab solidification structures under various nozzle configurations were simulated using the dendrite growth model. The results demonstrate that either raising the spraying height or shortening the inter-nozzle distance effectively mitigates W-shaped morphological gradient of the solidification front and improves the transverse grain size distribution consistency. Based on the above findings, a novel strategy/approach for controlling the slab internal quality was proposed, aiming to enhance the evenness of solidification structures, and suppress the formation of internal defects such as cracks, segregation, and shrinkage cavities.</p>

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Effect of nozzle configuration on solidification structure and cooling/reheating rates in slab continuous casting

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Hui-Sheng Wang,
  • Jiang-Shan Zhang,
  • Lin-Heng Chen,
  • Chun-Hui Zhang,
  • Ming Li,
  • Wei-Li Huang,
  • Min Guan,
  • Qing Liu

摘要

Nozzle configuration is closely related to spray cooling efficiency, subsequently impacting solidification and heat transfer behaviors of the strand during continuous casting. Understanding these effects is essential for improving slab quality, yet the specific links between nozzle arrangement, cooling/reheating rate distribution, and solidification structure remain unclear. To clarify these relationships, a dendrite growth model was developed based on the prior study, incorporating the influence of spraying water distribution. The relationships between nozzle configuration and the distributions of surface cooling and reheating rates, internal cooling rate, grain size, and solidification front morphology were systematically explored. The results indicate that extending the spraying height enhances the surface thermal uniformity, whereas a wider inter-nozzle distance tends to diminish the uniformity of cooling and reheating rate distributions. In addition, the nozzle configuration and solidification structure evolution collectively determine the cooling rate distribution characteristics within the slab. Specifically, the distribution becomes more uniform under a greater spraying height. In contrast, as the inter-nozzle distance grows, the distribution uniformity initially improves and then declines during the columnar crystal growth and columnar-to-equiaxed transition stages and gradually decreases throughout the equiaxed crystal growth stage. Furthermore, the slab solidification structures under various nozzle configurations were simulated using the dendrite growth model. The results demonstrate that either raising the spraying height or shortening the inter-nozzle distance effectively mitigates W-shaped morphological gradient of the solidification front and improves the transverse grain size distribution consistency. Based on the above findings, a novel strategy/approach for controlling the slab internal quality was proposed, aiming to enhance the evenness of solidification structures, and suppress the formation of internal defects such as cracks, segregation, and shrinkage cavities.