The effects of refractories of quartz-corundun consisting of 45 mass % quartz and 55 mass % corundum , fused corundum and fused magnesia on the total axygen content ( TOC ) and the composition of inclusions in interstitial free( IF) steel were studied.3 mass% microsilica was added into the three refractories as binder. The refractories were shaped as lining of the graphite crucible by castable method .IF steel was placed in the crucibles,then they were heated at 1600℃ for 90 min and 45 min respectively.Oxygen contents of the steel samples were obtained by axygen determinator . Inclutsions were analyzed by SEM and EDS.The results show that the TOC of steel increased with increase of Index of Oxygen Potential ( IOP ) of the refractories . The steel sample coped with MgO refractories having the lowest IOP has the lowest TOC.
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