Solidification and cooling of a continuously cast steel slab and the simultaneous heating of the mould is a very complicated problem of transient heat and mass transfer. This is described by the Fourier-Kirchhoff equation and the temperature field of the mould is described by the Fourier equation. Such a problem cannot be solved without a numerical model of the temperature field ― of the actual concasting while it is passing through the concasting machine (CCM) and the mould. The paper discusses the application of a three-dimensional (3D) numerical model of the temperature field of a solidifying concasting. A very important part of the analysis is to determine the necessary parameters on an actual CCM during production. The investigation focuses mainly on determining the temperature in the tundish, the temperatures of the walls of the mould, on the surface temperatures of the slab under the mould (measured by means of pyrometers), the surface temperatures within the tertiary cooling zone (measured by means of thermocouples) and on determining the metallurgical length of the concast slab using the radio-isotope method.
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