| 摘要 |
PURPOSE:To prevent the degradation in the quality of molten steel during the time until the bottom end of a long nozzle for charging molten steel is immersed in the molten steel by sticking a cylinder made of a material which is eroded or annihilates to the bottom end of said nozzle. CONSTITUTION:In starting charging of molten steel from a ladle 1 into a tundish 3 for continuous casting, a cylinder 5 made of an eroding material such as thin iron sheet or a material such as carboard or the like which burns away is stuck by means of a band or the like to the bottom end of a long nozzle 4 to extend the nozzle 4 temporarily downward. The charging flow 2a of the molten metal is kept sealed until the body of the nozzle 4 is immersed in the molten steel, whereby the quality of the molten steel is protected. |
