INJECTION NOZZLE FOR LADLE AND CONTINUOUS CASTING METHOD

To remove floating of an inclusion flowing into a tundish and a slag-based inclusion caused by a ladle slag, and suppress winding entrapment of the inclusion and the tundish slag floating and separated on a tundish molten metal surface.SOLUTION: An injection nozzle for a ladle includes a nozzle side wall part 10, and a bottom face part 11 positioned on the lower end of the nozzle side wall part 10, wherein a pair of at least two side part discharge holes 12 are provided at positions symmetrical to a virtual surface which is parallel in a tundish longitudinal direction and passes through a nozzle center on the nozzle side wall part 10, one or more bottom part discharge holes 13 are provided on the bottom face part 11, and a relation among a sum SS of open hole areas of the side part discharge holes 12, a sum SB of open hole areas of the bottom part discharge holes 13, a bottom area S on the nozzle internal side of the bottom face part 11, a height H of the side part discharge holes and a width W of the side discharge holes satisfies (1) to (3): 0.35≤SB/(SS+SB)≤0.50...(1), 0.30≤SB/S≤0.80...(2) and 0.10≤H/W≤3.0...(3).SELECTED DRAWING: Figure 1 【課題】タンディッシュ内に流入する介在物および取鍋スラグに起因するスラグ系介在物の浮上除去をはかり、タンディッシュ湯面上に浮上分離された介在物およびタンディッシュスラグの巻き込みを抑制する。【解決手段】ノズル側壁部１０と、ノズル側壁部１０の下端に位置する底面部１１とが備えられ、ノズル側壁部１０には、タンディッシュ長手方向に平行かつノズル中心を通る仮想面に対して対称な位置に、少なくとも２つの側部吐出孔１２が一対で設けられ、底面部１１には、１つ以上の底部吐出孔１３が設けられ、側部吐出孔１２の開孔面積の和ＳＳ、底部吐出孔１３の開孔面積の和ＳＢ、底面部１１のノズル内部側の底面積Ｓ、側部吐出孔の高さＨ、側部吐出孔の幅Ｗの関係が、（１）～（３）を満たす取鍋用注入ノズル。０．３５≦ＳＢ／（ＳＳ＋ＳＢ）≦０．５０...（１）０．３０≦ＳＢ／Ｓ≦０．８０...（２）０．１０≦Ｈ／Ｗ≦３．０...（３）【選択図】図１