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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 19b
SUMMARY:Reoxidation behavior of Al-killed ferritic stainless steel melts containing Ti
DESCRIPTION:According to the global carbon neutral policy, the hydrogen energy market is growing and interest in hydrogen fuel cells is growing too. For the fuel cell separator, the Ti-containing ferritic stainless steels are used due to their high corrosion resistance, electrical conductivity, and durability. In a conventional steelmaking process, final steel quality is mainly affected by continuous casting tundish operation. In particular, the refining of Ti-added ferrite stainless steel and the relevant cleanliness have been improved via vacuum-oxygen-decarburization (VOD) and ladle treatment (LT) processes. However, the reoxidation phenomena inevitably occur during melt transfer from ladle to continuous casting tundish, resulting in a loss of titanium yield in conjunction with a formation of reoxidative inclusions. Hence, the present works aims to systematically investigate the combinational effect of different tundish fluxes on the reoxidation behavior of Al-killed stainless steel melts containing Ti. Rice husk ash (RHA), MgO (M) powder, and CaO-Al2O3 (CA) based fluxes were used for the experiments. When the molten steel was covered by M+CA fluxes, the average size of inclusions decreased, and it was confirmed that most the of inclusions were liquid (Ti2O3-Cr2O3-Al2O3) system. On the other hand, when the RHA+CA fluxes were added, the average size of inclusion decreased, whereas total number of inclusions significantly increased due to a reoxidation reaction by SiO2 in RHA. When the M+RHA+CA combinative fluxes were added, the size of inclusion decreased, and the number of inclusions exhibited a value between the M+CA and RHA+CA conditions. Consequently, a decrease in total oxygen content was largest in M+CA flux combination experiment.
CLASS:PUBLIC
DTSTART:20230615T143000
DTEND:20230615T145000
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