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We have developed a theoretical analysis of the lubrication by slags of the continuous casting of slags by coupling a thermal analysis of the system with a model of the viscous flow of the slag between the shell and the mould. Comparison of the analysis with experiments suggests that the fusion process of the slag above the meniscus controls is flow rate at high viscosity or casting speed. As the results of the fusion experiments performed in laboratory seems not to be reliable for the study of the continuous casting, we have built a semi- empirical model of the slag melting process above the meniscus. We obtain a good estimation of the thermal flux extracted by the mould for low and high viscosity slags. Moreover the theoretical influence of the casting speed and the slag viscosity on the consumption and friction are qualitatively in good agreement with the industrial observations. All these results have been obtained under the assumption of a stationary mould; but the numerical integration of the dynamic equation of the film demonstrates the mould oscillations do not seem to have a great influence on these aspects of the continuous casting. The use of alternative assumptions on the rheological behaviour of the slag or the shell leads to unrealistic results.

Additional information

Bibliographic Reference: EUR 9339 EN/FR (1984) MF, 33 P., BFR 120, BLOW-UP COPY BFR 165, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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