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<p>During strip casting, heat transfer from the molten steel pool to the copper roller is significantly influenced by the oxide film deposited on the roller surface, casting temperature, and pool atmosphere. This study employs the droplet solidification technique to simulate the initial solidification of molten steel and the deposition of oxide film during strip casting. As the number of droplet ejection experiments increases, the peak heat flux between the droplet and substrate initially decreases, then increases, and finally decreases again. This trend is due to the increasing interfacial thermal resistance caused by the thickening deposited film during the first five ejection experiments. However, by the sixth experiment, the rising surface temperature of the film causes partial melting, reducing cavities at the interface and lowering thermal resistance. With further film deposition, the increasing thickness again reduces heat flux. With an increase in casting temperature, the wettability of the molten steel improves and the temperature difference between the two sides of the interface increases, resulting in improved interface heat transfer efficiency and coarser solidification structure. At a casting temperature of 1600 °C, the deposited oxide film composition is 15.67SiO<sub>2</sub>-53.35MnO-13.58B<sub>2</sub>O<sub>3</sub>-17.40FeO (wt&#xa0;pct) with the average grain size of approximately 212.7 <i>μ</i>m. Under an N<sub>2</sub> atmosphere, the interfacial heat flux is higher than under Ar, attributed to N<sub>2</sub>'s higher thermal conductivity. This also results in a coarser solidification structure under N<sub>2</sub>.</p>

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Effect of Casting Temperature and Atmosphere on Deposited Film, Interfacial Heat Transfer and Solidification Structure of 3.5 Wt Pct Silicon Steel Under Sub-rapid Solidified Process

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Jingzhou Lu,
  • Yunli Zhang,
  • Lulu Song,
  • Wanlin Wang,
  • Peisheng Lyu

摘要

During strip casting, heat transfer from the molten steel pool to the copper roller is significantly influenced by the oxide film deposited on the roller surface, casting temperature, and pool atmosphere. This study employs the droplet solidification technique to simulate the initial solidification of molten steel and the deposition of oxide film during strip casting. As the number of droplet ejection experiments increases, the peak heat flux between the droplet and substrate initially decreases, then increases, and finally decreases again. This trend is due to the increasing interfacial thermal resistance caused by the thickening deposited film during the first five ejection experiments. However, by the sixth experiment, the rising surface temperature of the film causes partial melting, reducing cavities at the interface and lowering thermal resistance. With further film deposition, the increasing thickness again reduces heat flux. With an increase in casting temperature, the wettability of the molten steel improves and the temperature difference between the two sides of the interface increases, resulting in improved interface heat transfer efficiency and coarser solidification structure. At a casting temperature of 1600 °C, the deposited oxide film composition is 15.67SiO2-53.35MnO-13.58B2O3-17.40FeO (wt pct) with the average grain size of approximately 212.7 μm. Under an N2 atmosphere, the interfacial heat flux is higher than under Ar, attributed to N2's higher thermal conductivity. This also results in a coarser solidification structure under N2.