| 摘要 |
PROBLEM TO BE SOLVED: To prevent rough surface caused by cleaning with oxygen and to restrain sticking of inclusion onto the inner hole part of an immersion nozzle. SOLUTION: Molten steel in a tundish 16 is cast into a mold 22 by using the immersion nozzle 20. When a kind of the steel is changed, the oxygen gas is blown and supplied into the inner hole part of the immersion nozzle 20 through a gas supplying tube 24. The stuck material stuck on the inner hole part of the immersion nozzle 20 is burnt and removed with this supply of the oxygen. Since a refractory material constituted of a lining lined on the inner hole part of the immersion nozzle 20 is set to <=1 wt.% carbon content, the rough surface caused by decarburization at the cleaning with the oxygen is restrained.
|
