To overcome the limitations of differential thermal analysis (DTA)

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REVISIÓNTransferencia de calor en la colada continua de aceros (#) I parte. El molde C. Cicutti^Resumen El molde de colada continua cumple la importante función de recibir el acero líquido y permitir que se desarrolle una capa solidificada uniforme y libre de defectos. En este trabajo se revisan los distintos mecanismos implicados en el proceso de transferencia de calor, desde el acero líquido hasta el agua de refrigeración del molde. Se analiza también el efecto de las distintas variables de funcionamiento en la extracción calórica producida y la relación entre el flujo global de calor y su distribución a lo largo del molde.Palabras clave: Colada continua. Aceros. Transferencia de calor. Molde. Solidificación.Heat transfer in the continuous casting of steels Part 1. The mold AbstractThe continuous casting mold plays the important role of receiving the liquid steel and allowing an uniform and defect free solidified skin to be developed. In this work, the different heat transfer mechanisms which are present from the liquid steel to the mold cooling water are reviewed. The effect of operating variables on heat extraction and the relationship between global and distributed heat flux are also analyzed.

In the present paper, different trials using BaO as a ladle slag tracer were performed to investigate the role of slags on the formation of non-metallic inclusions. Results of these trials showed that the ladle slag may actively contribute to the generation of inclusions. In those heats where the tracer was added it was found that about one-third of the large inclusions detected in the final product had BaO in their composition. These inclusions may be generated by emulsification of the ladle slag during the refining stage at the ladle furnace. Additionally, inclusions containing BaO were also observed in some of the heats processed with the same ladle that previously had been used with traced slags. This fact suggests that the slag layer that remains stuck to the ladle wall after finishing the heat may be a source of inclusions for the next heat.