Refractory material, continuous casting nozzle using the refractory material, production method for the continuous casting nozzle, and continuous casting method 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, A12 0 3) 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 B20 3 and R20 (R is one selected from the group consisting of Na, K and Li) in an amount of 0.5 mass% or more; A120 3 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, B20 3 and R20 is in the range of 1.0 to 15.0 mass%, and a mass ratio of CaO / (B20 3 + R20) is in the range of 0.1 to 3.0. [REPRESENTATIVE DRAWING] FIG. 4 - 51 -