The steel casting temperature is defined as liquidus temperature plus the superheat temperature. In practice, it is the temperature measured in the tundish during the continuous casting of steel. Together with the casting speed and water settings in the secondary cooling, they are key process parameters of continuous steel casting, and have a decisive impact on the quality of cast strands. An increase in the casting speed causes an increase in the strand temperature during continuous casting [1-4]. The paper analyses the impact of two casting speeds on the cast billet surface temperature for the selected strands of a continuous steel casting machine. The experiments were carried out in the industrial conditions at ArcelorMittal Poland S.A. Dąbrowa Górnicza at a six-strand machine for billet casting. When casting a sequence comprising five heats of a high carbon steel grade, dimensions 160x160 mm, the temperature was continuously measured with two optical pyrometers. One measurement point was located within the secondary cooling chamber, whereas the other one was immediately after the exit of the strand from the chamber. Additionally, during casting, the temperature was measured on the selected caster strands with a thermographic camera. This paper will present conclusions on the performed measurements of the cast strand surface temperature. Determining a reliable and accurate impact of the superheat temperature on the strand surface temperature was possible thanks to the capacity of the steel ladle, which exceeded 300 t.Keywords: Continuous casting, high carbon steel, temperature measurement, casting speed
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