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The aim of this study is to clarify the mechanism of low total oxygen (T.O) contents in high‐Al containing steel grades. Steel samples are taken from a ladle during an LF‐RH process, and the compositions of both the steels and inclusions are determined. According to thermodynamic considerations, the low T.O contents of high Al steel grades are due to the low insoluble oxygen contents. Due to the high Al contents in a steel melt, thermodynamic driving forces of the Al 2 O 3 modification are lower than those in ordinary Al‐killed steels. Both the low thermodynamic driving force of the Al 2 O 3 modification and the inclusion removal from the melts contribute to the low CaO contents in inclusions in high‐Al steel melts. The contact angles of inclusions in high Al steel melts are higher than 90° due to the low CaO content in inclusions. Therefore, the removal tendency of inclusions in high Al steel melts is kept high throughout an LF‐RH process. Due to this high removal tendency, the T.O contents in high Al steel melts decreases remarkably during an LF refining process. Thereafter, they decrease further during the following RH treatment.
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Yoshioka et al. (2017) studied this question.
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