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Impact of Internal Carbothermic Reaction in SEN Refractory for Interfacial Reaction Between SEN and Liquid Steel

Nozzle clogging is often caused by adhesion of suspending inclusions, reaction between refractory and molten steel, temperature drop, etc. Among these, in the present study, the interfacial reaction between molten steel and the refractory was investigated with emphasis on the carbothermic reaction inside the nozzle refractory. Various nozzle refractories composed of different constituents were employed: alumina-silica-C base, alumina-C base, lime-zircornia-C base, C-less and oxide-less refractories. The carbothermic reaction was assessed in various ways: thermodynamic calculations, in-situ gas analysis using QMS, and evolution of steel components during reaction between the molten steel and the refractory. The reactivity with the molten steel for each refractory was evaluated. It was found that suppression of the carbothermic reaction is one of the most important points to minimize the interfacial reaction, thereby lowering probability of suspending inclusion deposition. Oxide-less refractory was found to be promising.
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2022 International Conference on the Science and Technology of Steelmaking
PR-531-016
D-J. Lee, Y-M. Cho, Y-B. Kang
August 04, 2022
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