Abstract
Department of Materials Science and Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Korea*University of Ulsan, School of Materials Science & Engineering, San 29, Moogeo-dong, Nam-gu, Ulsan 680-749, Korea(Received December 15, 2008 : Received in reviced form December 26, 2008 : Accepted December 29, 2008)Abstract The use of dolomite refractories has increased during the past several years in the manufacturingof clean steel during the stainless steelmaking process. However, at the same time, the use of dolomiterefractories has led to what is known as the skull formation. In the present work, to understand the skullformation, the wetting characteristics of dolomite substrates by liquid Fe-19wt%Cr-10wt%Ni alloys in variousoxygen partial pressures were initially investigated at 1753K using the sessile drop technique. For comparison,the wetting characteristics of alumina substrates were investigated with the same technique. It was found thatthe wetting index, (1+cosθ), of dolomite is approximately 40% higher compared to those of alumina. In addition,the oxygen partial pressure to generate the surface oxide, which may capture the liquid metal on the refractorysurface, for dolomite is much lower than that for alumina. From this study, it was concluded that the use ofdolomite is much more closely associated with the skull formation compared to the use of alumina due to thestronger wettability and the surface oxide formation at a lower oxygen partial pressure of dolomite.Kew wordsdolomite, sessile drop method, skull, stainless steel, wetting.
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