IMMERSION NOZZLE SUPPRESSING DRIFT IN THICKNESS DIRECTION OF MOLD BY PROVIDING INNER CIRCUMFERENTIAL FACE WITH A PAIR OF LEVEL DIFFERENCE

PROBLEM TO BE SOLVED: To provide an immersion nozzle which can suppress a drift in the thickness direction of a mold in a high level. SOLUTION: Rectifying projections 5 are respectively provided at the positions being the inner circumferential face 4 of an immersion nozzle 1 and also at the positions held between a pair of discharge holes 2 viewed from above. The lower edge part 5d of each rectifying projection 5 is almost parallel to the width direction of the mold in a vertical view. The immersion nozzle satisfies inequalities (1), (2), (3), (4) and (5) (wherein is an inner diameter of the nozzle [mm]; A is a horizontal thickness of the projection [mm]; B is a horizontal length of the projection [mm]; d1 is a vertical distance between the lower end of the rectifying projection and the inside bottom face of the nozzle [mm]; and d2 is a vertical distance between the upper end of the rectifying projection and the lower end thereof [mm]). COPYRIGHT: (C)2010,JPO&INPIT