REFRACTORY MATERIAL, CONTINUOUS CASTING NOZZLE USING THE REFRACTORY MATERIAL, PRODUCTION METHODS FOR THE CONTINUOUS CASTING NOZZLE, AND CONTINUOUS CASTING METHODS USING THE CONTINUOUS CASTING NOZZLE

摘要

[OBJECT];In an operation of continuous casting of steel grade such as aluminum-killed steel where a nozzle clogging phenomenon is particularly likely to occur, it is intended to prevent adhesion of inclusions (typically, Al₂O₃) on a nozzle used in the casting operation, and clogging of the nozzle due to the inclusions;[SOLUTION];A refractory material 10 is arranged to define a part or an entirety of a molten steel-contacting surface of a continuous casting nozzle, wherein the refractory material 10 contains: a CaO component in an amount of 0.5 mass % or more; one or both of B₂O₃ and R₂O (R is one selected from the group consisting of Na, K and Li) in an amount of 0.5 mass % or more; Al₂O₃ in an amount of 50 mass % or more; and free carbon in an amount of 8.0 to 34.5 mass %, and wherein a total amount of CaO, B₂O₃ and R₂O is in the range of 1.0 to 15.0 mass %, and a mass ratio of CaO/(B₂O₃+R₂O) is in the range of 0.1 to 3.0.