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<p>Mold flux is important in coordinating heat transfer and lubrication within the mold under varying casting speeds. Clarifying and revealing the influence of casting speed changes on the evolution of the slag film/air gap in the slag channel is of great significance for promoting stable casting operation and enhancing slab quality at high casting speeds. This study focuses on the slab continuous casting process. A numerical inverse model for heat transfer and solidification, as well as a numerical calculation model for slag film/air gap distribution, were developed based on measured data. Utilizing measured data under different casting speeds, the distributions of slag film/air gap thickness and thermal resistance were calculated, aiming to analyze the variation rules of the slag film and air gap during casting speed changes. The results indicate that at lower casting speeds, an increase in speed promotes the growth of both the thickness and thermal resistance of the liquid slag layer, while suppressing air gap formation. The solid slag layer in the middle and upper sections of the mold shows no significant change, whereas notable growth occurs in the lower section. Conversely, at higher casting speeds, a further increase in speed inhibits the growth of the slag film’s thickness and thermal resistance, while promoting air gap formation. When the casting speed increases from 0.6 to 1.0&#xa0;m/min, the solid slag layer thickness at the mold exit increases from 1.44 to 2.14&#xa0;mm. However, upon a further increase to 1.4&#xa0;m/min, the solid slag film thickness decreases to 0.62&#xa0;mm. Furthermore, when significant changes occur in the thickness of the slag film and air gap, similar changes are observed in their thermal resistance and contribution to the overall thermal resistance of the slag channel. The thickness and thermal resistance of the slag film/air gap, as well as the initial position of air gap appearance, exhibit a nonlinear relationship with increasing casting speed. A specific casting speed exists concerning its effect on the slag film/air gap in slab casting. The impact of casting speed on the slag film/air gap differs markedly before and after this specific casting speed.</p>

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Effect of Casting Speed on the Distribution of Slag Film/Air Gap Thickness and Thermal Resistance in Slab Continuous Casting Mold

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Liandong Zhang,
  • Zijian Wei,
  • Qican Wang,
  • Man Yao,
  • Xudong Wang

摘要

Mold flux is important in coordinating heat transfer and lubrication within the mold under varying casting speeds. Clarifying and revealing the influence of casting speed changes on the evolution of the slag film/air gap in the slag channel is of great significance for promoting stable casting operation and enhancing slab quality at high casting speeds. This study focuses on the slab continuous casting process. A numerical inverse model for heat transfer and solidification, as well as a numerical calculation model for slag film/air gap distribution, were developed based on measured data. Utilizing measured data under different casting speeds, the distributions of slag film/air gap thickness and thermal resistance were calculated, aiming to analyze the variation rules of the slag film and air gap during casting speed changes. The results indicate that at lower casting speeds, an increase in speed promotes the growth of both the thickness and thermal resistance of the liquid slag layer, while suppressing air gap formation. The solid slag layer in the middle and upper sections of the mold shows no significant change, whereas notable growth occurs in the lower section. Conversely, at higher casting speeds, a further increase in speed inhibits the growth of the slag film’s thickness and thermal resistance, while promoting air gap formation. When the casting speed increases from 0.6 to 1.0 m/min, the solid slag layer thickness at the mold exit increases from 1.44 to 2.14 mm. However, upon a further increase to 1.4 m/min, the solid slag film thickness decreases to 0.62 mm. Furthermore, when significant changes occur in the thickness of the slag film and air gap, similar changes are observed in their thermal resistance and contribution to the overall thermal resistance of the slag channel. The thickness and thermal resistance of the slag film/air gap, as well as the initial position of air gap appearance, exhibit a nonlinear relationship with increasing casting speed. A specific casting speed exists concerning its effect on the slag film/air gap in slab casting. The impact of casting speed on the slag film/air gap differs markedly before and after this specific casting speed.