Despite the development of steel making technologies a significant portion of deoxygenation reactions products remain in the molten metal until the time of casting. These ration products are referred to as non-metallic inclusions and their dimensions lower than 30 μm. Years of research, both in laboratory and in industrial environment, showed that these type of inclusions can be removed using multi-holed ceramic filters. Additionally, filters can, when used in continuous steel casting installations, reduce the risk of clogging of tundish nozzles. Clogging is frequent problem during casting of steel deoxidized with aluminium. In this situation the outlet may act like ceramic filter when non-metallic inclusions are deposited on its edge. In effect, this results in the need for early termination of the casting process. The internal diameter of nozzles is from 3 to 4.5 10-2 m (for the experiments presented in this publication). The problem with this issue was raised by other researchers [1, 2]. Paper presents the results of studies on this phenomenon.Keywords: Steel, tundish, ceramic filter, continuous casting, nozzle
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