Krosakiharima Corporation

Nippon Steel Sumitomo Metal Corporation

Takashi Sadano

Shinichi Fukunaga

Takuya Okada

Katsumi Morikawa

Arito Mizobe

Takahiro Kuroda

Yoshitaka Hiraiwa

Akinari Sasaki

Kazuhisa Tanaka

Keiichiro Neba

A nozzle structure for discharging molten steel with improved sealing performance. The nozzle structure comprises: a molten steel discharge path having an inner bore; and one or more joints through which the molten steel discharge path is divided at one or more positions in a orthogonal direction with respect to an upward-downward direction of discharge of molten steel, and which join the molten steel discharge path. An inner bore sleeve is formed of a refractory material, and provided on an inner bore surface of the nozzle structure to extend in the upward-downward direction across at least one of the joints.

Nozzle structure

In a insert-type continuous casting nozzle comprising a highly functional layer formed to have a high corrosion resistance, a high anti-attachment capability, etc., and provided to define an inner bore thereof, the present invention is directed to providing a refractory material (mortar) for an intermediate layer of the continuous casting nozzle, which has a property capable of fixing an inner bore-side layer to an outer periphery-side layer (a nozzle body) of the continuous casting nozzle, while preventing the occurrence of expansion splitting in the outer periphery-side layer due to a difference in thermal expansion between the inner bore-side and outer periphery-side layers, and a continuous casting nozzle using the refractory material for the intermediate layer. The refractory material for the intermediate layer contains a hollow refractory aggregate in an amount of 10 to 75 volume %, wherein a ratio of an average radius R of each particle of the aggregate to an average wall thickness t of the particle satisfies the following relation: R/t&#x2267;10. This refractory material is disposed between an inner bore-side layer () and an outer periphery-side layer () of a continuous casting nozzle.

Refractory material for nozzle for use in continuous casting, and continuous casting nozzle

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Fukuoka, Japan

Takashi Sadano