| 摘要 |
PURPOSE:To discharge molten metal from each hole of one pair of discharging holes at almost equal rate as preventing biased flow for the molten metal and to prevent the mixing of impurity into a product and the remelt of solidified shell by discharging the molten metal from discharging hole as circular flow by inclined projecting members, which project on the peripheral wall of molten metal flowing passage for a molten metal pouring nozzle. CONSTITUTION:At the time of pouring the molten steel 22, which is poured into a tundish 21 from a ladle, into a mold 40, this nozzle prevents effectively the biased flow of molten steel, which develops at the time of adjusting the molten steel flowing rate by shifting a sliding nozzle 26, and eliminates the bad effect caused by biased flow. That is, when the molten steel. which has become to the biased flow, reaches to the inclined wing members 36 arranged at the molten steel flowing passage 15 in the molten steel pouring nozzle 31, a part of the molten steel flow with high speed is weakened by the wing members 36 and also flowed along the upper face of wing members 36, to become to the circular flow. As the circular flow is discharged from each hole of one pair of the discharging holes 34a, 34b as almost equal rate of molten steel, the remelting of solidified shell 41 and the powder inclusion 42 are prevented and the quality of cast slab is improved. |
