| 摘要 |
PURPOSE:To add trace elements in particular to a molten steel with good accuracy and to provide a steel material having uniform quality by blowing a powder additive to the molten steel through the fine hole provided to a nozzle to be used for injecting the molten steel from a ladle to a tundish. CONSTITUTION:The fine hole 16 is provided to the refractory nozzle 6 to be used for pouring the molten steel 4 from the ladle 2 to the tundish 8. The powder additive 5 contg. the trace elements is blown through the hole 16 from a tank 12 for pressurizing the powder additive by an inert gas into the steel 4. The additive 5 is thus uniformly stirred by the falling energy of the molten steel 4, by which the components are adjusted with good accuracy and the steel material having the uniform material quality is obtd. |
