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Round continuous casting moulds of a diameter of 180 mm were fitted with more than seventy thermocouples at HKM GmbH. The all-encompassing arrangement of the measuring points, in combination with appropriate evaluation methods, permits detailed study of heat-flux densities as a function of various operating parameters. The software developed specifically for this purpose allows online monitoring during sequence casting and detailed analysis of the measured data recorded. A false-colour image is used to display the thermal processes of casting visually. The objective is the optimisation of surface quality via selection of optimum casting fluxes. Casting slag thickness, the formation of oscillation marks and early detection of imminent breakouts are also to be investigated.