ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Optimization of Steel Chemistry for MnS Precipitation on Oxide Inclusions in Si/Mn Deoxidized Steel
Han S. KimHae-Geon LeeWoo-Gwang Jung
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2000 Volume 40 Issue Suppl Pages S82-S86


A technique for optimization of steel chemistry for MnS precipitation on oxide inclusions has been developed through employing the computational thermodynamic method. The optimum composition of Si/Mn deoxidized steel was estimated to be Fe-0.1mass%C-0.1mass%Si-1.5mass%Mn-0.01mass%O-0.007mass%S. The prediction was validated by experiments using a semi-levitation melting technique. The inclusions mainly consisted of MnO-SiO2 oxides with MnS precipitates. The observed morphology revealed a possibility of both oxide and sulfide having been precipitated as liquid phase, although the existing thermodynamic data do not support this to occur.

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