| 摘要 |
PURPOSE:To suppress effectively intrusion of inclusions by providing a projecting body on the outside circumferential surface of an immersion nozzle or disposing heterogeneous refractories thereto. CONSTITUTION:An immersion nozzle 7 is provided with refractories slightly more thickly in a slag line part 9 where erosion is heavy on account of contact with suspended powder and slag than in the other parts. At least one discharge holes 10 are punched in the lower part of the nozzle. For example, heterogeneous refractories 12 are inserted, like a headband, on the outside circumferential wall surface 11 of such nozzle 7 or are disposed zigzag or longitudinally. Projecting parts 13 are otherwise provided on the surface 11 to form the surface 11 of the nozzle 7 into a rugged shape. |
