| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an immersion nozzle where an inert gas is blown to an inner hole to form into the circulation passage of molten steel, in which the dissipation of an inert gas from the outer circumferential face of the immersion nozzle is suppressed, and the sticking of inclusions or the like to the wall face of the inner hole is securely prevented. Ž<P>SOLUTION: In the immersion nozzle 10 comprising: an inner hole 1 to form into the circulation passage of molten steel from a tundish to a mold; a gas permeable inner hole body 2 arranged so as to face the inner hole 1; and a hollow chamber 3 formed at the outer circumferential side of the inner hole body 2, and wherein an inert gas introduced into the hollow chamber 3 is blown off from the inner hole body 2 to the inner hole 1, in the wall side on the outer circumferential side of the hollow chamber 3, at least at the region corresponding to the powder line of a mold, a refractory layer 7 having gas permeability lower than that of a refractory 5 on the outer circumferential side of the region is arranged. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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