Krosakiharima Corporation

Mitsunobu Sato

Arito Mizobe

Takahiro Yasuda

The present invention is directed to creating a less-energy loss or smooth (constant) molten steel flow with a focus on a configuration of a bore of an upper nozzle, so as to provide an upper nozzle formed with a bore having a configuration capable of to suppress deposit formation. For this purpose, in an upper nozzlefor allowing molten steel to flow therethrough, a radius of an upper end of a boreis set to be equal to or greater than 1.5 times a radius of a lower end of the bore, and a bore surfaceis formed in a vertical cross-sectional configuration represented by log(r(z))=(1/n)&#xd7;log((H+L)/(H+z))+log(r(L))(n=1.5 to 6).

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Fukuoka, Japan

Mitsunobu Sato