Per: Ana Carolina Ribeiro Dal Bosco (Universidade federal do Rio grande do Sul), Magda Beatriz Galant François (UFRGS), Wagner Viana Bielefeldt (UFRGS), Antônio Cezar Faria Vilela (UFRGS), Arthur Munch (UFRGS), Victor Goldschmidt (UFRGS)
Abstract:
In order to optimize processes and steel quality in the steel industry it is necessary to study the oxide inclusions and their interactions with the slag during the continuous casting process of steels. The non-metallic inclusions are a result of the steelmaking process, so the study of the size and distribution of the inclusions in the liquid steel is essential to improve the degree of limpidity and consequently the quality of the steels. Physical models are widely used, because in-plant studies are unfeasible due to the cost and the safety risk due to high temperatures. The objective of this work is to evaluate the removal of inclusions through the quantification of inclusions by means of the mass balance of inclusions passing and not passing through the shaft of a continuous casting tundish of long steels. The average results of the tests showed that, for a configuration in permanent regime, as a function of the casting speeds of 0.69 m/min; 0.77 m/min and 0.86 m/min, the average values of 0.99%, 0.9% and 0.45% of inclusions passing to the lateral shaft and 0.31%, 0.21% and 0.11% of inclusions passing to the central shaft, for the respective speeds mentioned, were obtained. According to the general results, for the casting speeds of 0.69 m/min; 0.77 m/min and 0.86 m/min, the total average result for the tests was 0.65%; 0.55% and 0.28% of inclusions passing through the shaft, respectively, which is favorable for inclusions removal.