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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
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
[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.
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机译:[目的]在特别可能发生喷嘴堵塞现象的钢等级例如铝镇静钢的连续铸造的操作中,旨在防止夹杂物(通常为Al 2 O 3)粘附在铸造操作中使用的喷嘴上。 [解决方案]设置耐火材料10以限定连续铸造喷嘴的钢水接触表面的一部分或全部,其中,耐火材料10包含:CaO成分0.5质量%以上。 B 2 O 3和R 2 O中的1个或2个以上(R为选自Na,K和Li中的一种)为0.5质量%以上。 Al 2 O 3为50质量%以上。游离碳为8.0〜34.5质量%,CaO,B 2 O 3和R 2 O的合计量为1.0〜15.0质量%,且CaO /(B 2 O 3 + R 2 O)的质量比为1.0〜15.0质量%。范围是0.1到3.0。
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