| 摘要 |
PROBLEM TO BE SOLVED: To provide an immersion nozzle where the flow velocity of molten steel in the corner part of a mold is made low while securing the flow rate of the molten steel to be discharged into the mold and as a solidification delay can be suppressed. SOLUTION: The immersion nozzle has a shape of a cylinder with a bottom, and is provided for pouring molten steel held in a tundish into a mold. A pair of confronted molten steel discharge holes is perforated at the circumferential wall of the immersion nozzle, and further, on the inner bottom face of each molten steel discharge hole, a molten metal discharge groove elongating in parallel with the perforating direction of the molten steel discharge hole in the bottom face view of the immersion nozzle is engraved and provided. Further, the following formulae (1) and (2) are satisfied: a/A= (1) 0.1 to 0.9, and (2)Δθ[deg.]=15 to 45; wherein (a) denotes the engraved width of each molten steel discharge groove; (A) denotes the width of the opening end on the outer circumferential side of each molten steel discharge hole; andΔθdenotes a difference between the angle formed by the inner bottom face of each molten steel discharge hole and a level and the angle formed by the inner bottom face of each molten steel discharge groove and a level. COPYRIGHT: (C)2008,JPO&INPIT
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