PURPOSE: To cast a cast slab having less center segregation by continuous casting.
CONSTITUTION: The inner diameters of molten metal flowing-down holes, 5a, 6a of a slide plate 5 and a seal plate 6 are mode larger than the inner diameter of molten metal flowing-down hole 7a of a flow straightening nozzle 7, and the inner diameter of funnel shaped molten metal flowing passage 2a of an insert nozzle 2 and the inner diameter of molten metal flowing-down hole 4a of a bottom plate 4 are made larger than the inner diameters of the molten metal flowing-down holes 5a, 6a of the slide plate 5 and the seal plate 6. The area common to both the molten metal flowing-down holes 4a, 5a of the bottom plate 4 and the slide plate 5 is made wider than the area common to both the molten metal flowing-down holes 5a, 6a of the slide plate 5 and the seal plate 6, and the molten metal allowed to flow down from the molten metal flowing-down hole 6a of the seal plate 6 collides against the end of the flow straightening nozzle 7, and the collision flow falls down as it is. Rebounded flow collides against the inner wall of the flow straightening nozzle 7 opposite the side of collision and falls down along that inner wall, and thereby, since cores of cubic system are increased, the cast slab having less center segregation can continuously be cast.
TANIGUCHI KAZUYUKI
AYADA KENZO
