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<p>In the continuous casting process, the heat transfer control of slag films is pivotal for ensuring uniform solidification of the liquid steel and minimizing the slab surface defects. However, real-time online characterization of the temperature distribution and heat flux of slag film under extreme casting conditions remains a significant challenge. This study introduces an innovative methodology combining double hot thermocouple technology (DHTT) with a high-precision infrared thermal imager, to achieve in situ visualization of the formation evolution of slag film and its real-time temperature field change. Results demonstrate that crystallization initiates preferentially in the 1000&#xa0;°C region for the present CaO-SiO<sub>2</sub> based mold flux and then establishes a crystalline layer characterized by sequential morphology of lath crystals (high-temperature zone) and dendritic crystals and granular grains (low-temperature zone). Within the triple-layer structure of slag film, the glass and liquid layers exhibit a low heat conductivity, while the crystalline layer exhibits stepwise thermal conductivity enhancement, driven by progressive porosity reduction and morphological transitions. Furthermore, increasing slag film thickness expands its triple-layer structure and lengthens heat transfer pathways, thereby elevating thermal resistance across the slag film and thus enhancing its heat transfer control capability.</p>

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In Situ Observation of Temperature Distribution of Slag Film by Online Infrared Thermal Imager

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Li Zhang,
  • Yongqi Sun,
  • Xu Gao,
  • Lei Zhang,
  • Wanlin Wang

摘要

In the continuous casting process, the heat transfer control of slag films is pivotal for ensuring uniform solidification of the liquid steel and minimizing the slab surface defects. However, real-time online characterization of the temperature distribution and heat flux of slag film under extreme casting conditions remains a significant challenge. This study introduces an innovative methodology combining double hot thermocouple technology (DHTT) with a high-precision infrared thermal imager, to achieve in situ visualization of the formation evolution of slag film and its real-time temperature field change. Results demonstrate that crystallization initiates preferentially in the 1000 °C region for the present CaO-SiO2 based mold flux and then establishes a crystalline layer characterized by sequential morphology of lath crystals (high-temperature zone) and dendritic crystals and granular grains (low-temperature zone). Within the triple-layer structure of slag film, the glass and liquid layers exhibit a low heat conductivity, while the crystalline layer exhibits stepwise thermal conductivity enhancement, driven by progressive porosity reduction and morphological transitions. Furthermore, increasing slag film thickness expands its triple-layer structure and lengthens heat transfer pathways, thereby elevating thermal resistance across the slag film and thus enhancing its heat transfer control capability.