| 摘要 |
PURPOSE:To prevent the impurities from including into molten metal and trouble in casting by forming spiral shape developing as shifting toward the axial direc tion, while rotating elliptically the molten metal under making this center to the axis in the molten metal flow passage of nozzle. CONSTITUTION:In the internal part of a molten steel flow passage 33 of a tundish nozzle 31, the spiral shape having elliptical section and developing as shifting toward the vertical axis direction is formed while rotating the ellipse under making this center to the axis. The molten steel 22 is poured into a tundish 21 from a ladle and further poured into a mold 34 from a molten steel discharging hole 23 through a sliding nozzle 26 and the tundish nozzle 31. Then, as the partial of flow passage 33 is shaped to spirally, the molten steel flow is rotated and the development of biased flow is prevented. Therefore, the molten steel 22 flow is uniformed and the enclosure of powder 36 or remelt of solidified shell 35 is prevented. That is, the including of impurities into the molten steel and the trouble in the casting are prevented. |
