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Since the demand of improved steel cleanliness increases year by year, control of inclusions is always one of the main tasks of steelmakers.1,2) As an essential refining vessel, the continuous casting tundish shows good metallurgical functions for regulating the flow pattern of the molten steel and the removal of inclusion.3–6) Technologies for improving the removal of inclusions in the tundish have been traditionally studied as prerequisites for the manufacturing of clean steel products. Tundish is also known to cause the contamination of the molten steel by a complicated combination of various factors, including entrainment of ladle slag, reaction with tundish cover powders, erosion of refractories, reaction with ladle well packing materials and air absorption.7,8) Protection of the molten steel in tundish against contamination is of special importance to not only improve steel product quality, but also avoid the clogging of the submerged entry nozzle and correspondingly increase the number of sequence-cast heats.9) Reoxidation during continuous casting is defined as the reaction of elements in the molten steel and oxygen during pouring of the killed steel from the ladle to the mold.10) Reoxidation in tundish might lead to the increase of steel oxygen level, the generation of large exogenous inclusions Transient Behavior of Inclusions during Reoxidation of Si-killed Stainless Steels in Continuous Casting Tundish