Abstract
Abstract Samples of interstitial free (IF) steel were heated at 1600 ° C for 90 min in graphite crucibles lined with MgO based castables bonded with microsilica. The total oxygen content (TOC) of the IF steel was determined for castables with various microsilica contents, and inclusions in the steel and refractory were characterised by SEM and EDS. As the microsilica content in the MgO castable increased from 3 to 7 wt-%, the TOC of the IF steel decreased. It is proposed that this is due to the formation of a viscous liquid layer between the molten steel and the refractory. This liquid layer prevents dissolution of oxides from the refractory into the molten steel and so decreases the TOC of IF steel. In addition, the liquid layer may act as an absorber for oxide inclusions in the molten steel.
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