| 摘要 |
PROBLEM TO BE SOLVED: To provide an immersed nozzle which can suppress drift currents in the directions of the thickness and width of a casting mold. SOLUTION: The cylindrical immersed nozzle having a bottom is used for pouring molten steel to be held in a tundish into a casting mold. A pair of opposed molten steel discharging ports are formed on the peripheral wall of the immersed nozzle, and also a projecting portion is provided on the inside bottom surface so as to be parallel with the opening direction of the molten steel discharging ports in a bottom view. Further, the immersed nozzle satisfies the expression (1) of h/H=0.5 to 2.0 and the expression (2) of (a-b)/D=0.15 to 0.45, where h is the height of the upper surface of the projecting portion in the normal cross section for the elongating direction of the projecting portion; H is the distance between the lower end of the inner peripheral side opening edge of the molten steel discharging ports and the inside bottom surface; a is the width of the upper surface of the projecting portion of the immersed nozzle in a bottom view at the end portions of the projecting portion in the elongating direction; b is the width of the upper surface of the projecting portion of the immersed nozzle in a bottom view at the middle portion of the projecting portion in the elongating direction, and D is the inside diameter of the immersed nozzle. COPYRIGHT: (C)2008,JPO&INPIT
|
