Abstract
Abstract: The present experiment was conducted to a steel, Fe-20%Cr-10%Mn-6%Ni, in a 25kg intermediate frequency vacuum induction furnace at 1873K under protection of 0.08 MPa nitrogen gas. The inclusions in the steel were studied both before and after Al, Mg was added. The results revealed that the inclusions were removed more efficiently after treated by Al, Mg and the cleanness of metal was promoted to a higher level. The Al treated inclusions had more Mn, Cr and Fe at the core and a significant amount of Al around periphery according to line scanning analysis. After Mg was introduced, it concentrated at the surface of inclusions. The remaining Al content was as low as 0.01% which was lower than expected. The reaction between the Al and MgO crucible should be responsible for it and trace amount of Mg was found in the Al treated inclusions.
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