THIN SLAB NOZZLE FOR DISTRIBUTING HIGH MASS FLOW RATES

The present invention concerns a thin slab nozzle for casting thin slabs made of metal at a very high mass-flow, said thin slab nozzle comprising: - a central bore (50) defined by a bore wall and opening at inlet orifice (50u) and extending therefrom along the longitudinal axis X1 until it is closed at an upstream end (!Ou) of a divider (I 0). said central bore comprising: - an upstream bore portion (50a) comprising the inlet orifice and extending over a height, Ha, and, adjacent thereto, forming an upstream boundary (5a) with - a converging bore portion (50e) of height He located in the connecting portion of the thin slab nozzle, and adjacent thereto - a thin bore portion (50t) of height Hf located in the diffusing portion of the thin slab nozzle and ending at the level of the upstream end ( lOu) of the divider ( l 0), - first and second front ports ( 51) separated from one another by said divider (IO) and coupled to the central bore portion (50a) at least partially at the converging bore portion (50e); characterized in that. in a section of the thin slab nozzle along the first symmetry plane Til defined by (XI, X2) wherein X2 is normal to XI, the geometry of the wall of the central bore (50) is characterized as follows: - the radius of curvature at any point of the bore wall of the converging bore portion (50e) is finite, and the ratio of the height. Hf, of the thin bore portion (50f) to the height, He, of the converging bore portion (50e) is not more than 1, Hf/He :'Sl.