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In the continuous castingContinuous casting of crackCrack-sensitive steel, high-basicity mold flux faces the dilemma between lubrication and heat control. Soret effectSoret effect is at a 700 °C temperatureTemperature gradient between the mold and the shell. It causes element differentiation of the slag film and changes the crystallizationCrystallization direction, potentially solving the contradictory problems. This study used DHTT to simulate the above thermal environment and combined SEM and EMPA to investigate the effect of Al2O3Al2O3 on the crystallizationCrystallization behavior of slag film. The results showed that without Al2O3Al2O3, 3CaO·2SiO2·CaF23CaO·2SiO2·CaF2 precipitates near the solidificationSolidification line. Adding 3 wt% Al2O3Al2O3 caused Na and Si elements to migrate to the low-temperatureTemperature end, promoting Na2O·Al2O3Al2O3·2SiO2 and 3CaO·2SiO2·CaF23CaO·2SiO2·CaF2 growth from low to high temperaturesHigh temperature. The fluctuations of Na, Al, and Si elements are consistent. This indicates that Al2O3Al2O3 is the network former ([AlO4]−), which connects with Na and SiO3− chain to precipitate Na2O·Al2O3Al2O3·2SiO2.

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Influence of Al2O3 on Crystallization Behavior of Mold Slag Film Based on Soret Effect

  • 会议论文

  • 发表日期：

    2025年

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  • Qiuping Li,
  • Peng Cheng,
  • Guanghua Wen,
  • Ping Tang,
  • Zibing Hou,
  • Xinyun Mo

摘要

In the continuous castingContinuous casting of crackCrack-sensitive steel, high-basicity mold flux faces the dilemma between lubrication and heat control. Soret effectSoret effect is at a 700 °C temperatureTemperature gradient between the mold and the shell. It causes element differentiation of the slag film and changes the crystallizationCrystallization direction, potentially solving the contradictory problems. This study used DHTT to simulate the above thermal environment and combined SEM and EMPA to investigate the effect of Al2O3Al2O3 on the crystallizationCrystallization behavior of slag film. The results showed that without Al2O3Al2O3, 3CaO·2SiO2·CaF23CaO·2SiO2·CaF2 precipitates near the solidificationSolidification line. Adding 3 wt% Al2O3Al2O3 caused Na and Si elements to migrate to the low-temperatureTemperature end, promoting Na2O·Al2O3Al2O3·2SiO2 and 3CaO·2SiO2·CaF23CaO·2SiO2·CaF2 growth from low to high temperaturesHigh temperature. The fluctuations of Na, Al, and Si elements are consistent. This indicates that Al2O3Al2O3 is the network former ([AlO4]−), which connects with Na and SiO3− chain to precipitate Na2O·Al2O3Al2O3·2SiO2.