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Formation of Spinel Inclusions in Molten Stainless Steel under Al Deoxidation with Slags

T. Nishi, Kaoru Shinme

Abstract

Morphology change of inclusions were experimentally investigated under Al deoxidation of molten stainless steel with CaO-SiO2-Al2O3-MgO slags in order to clarify the morphology control factor of inclusions. 15kg of molten 18mass%Cr-8mass%Ni stainless steels were deoxidized by aluminum at 1873K, and the samples were taken at intervals to observe the inclusions by SEM and EDS. As the results, MgO contents of alumina type inclusions were gradually increased with time and the maximum contents were affected by a CaO/SiO2 ratio in slags. The formation of MgO-Al2O3, spinel type inclusions were also observed in case of high CaO/Si02 ratio. The origin of Mg in inclusions was presumed to be deformation of MgO in slags.

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Key concepts: Spinel, Materials science, Metallurgy, Aluminium, Slag (welding), Inclusion (mineral), Mineralogy, Geology