Submerged nozzle for the continuous casting of thin slabs

Details Submerged nozzle for the continuous casting of thin slabs Submerged nozzle for the continuous casting of thin slabs

B - Operations, Transporting

22

D

B22D 41/50 (2006.01)

Patent

CA 2257486

A dip pipe (1) which feeds by gravity with a molten metal or alloy (2) from a ladle (3) a slab (4) being formed in a thin mould (5) with cooling walls comprises a length of vertical pipe (6) communicating with the upper ladle (3) and downwards ending into a diffuser (8) of flattened shape having two discharge holes (9, 9'). According to the invention the diffuser (8) has a central partition baffle (14) designed to define two channels (16, 16') for the flow and corresponding to said two discharge holes (9, 9'), and the cross section area (10) of the flow at the highest level of the diffuser is less than the cross section area (11) of the pipe (6). Furthermore the inner side walls (12, 12') of the diffuser, which are directed to the narrow sides of the thin mould, form each an angle a <= 7.5° with the vertical axis (13) while departing therefrom in the downward direction, the flow partition baffle (14) narrowing in its lower portion to form two angles .beta. <= 7.5° with vertical axis (13).

La présente invention concerne un tube plongeur (1) permettant de couler par gravité du métal ou de l'alliage (2) en fusion pour mouler une plaque (4). Le métal ou l'alliage (2) en fusion proviennent d'une poche de coulée (3), le moulage se faisant dans un moule fin (5) pourvu de parois refroidissantes. Le tube plongeur (1), constitué d'un tube vertical (6) en communication avec la poche de coulée (3) située au-dessus de lui, aboutit dans un diffuseur (8) de forme aplatie pourvu de deux orifices de décharge (9, 9'). Le diffuseur de l'invention comporte une cloison centrale de séparation (14) définissant deux voies d'écoulement (16, 16') correspondant chacune à l'un des orifices de décharge (9, 9'), la section (10) de la voie d'écoulement au point le plus haut du diffuseur étant inférieure à la section (11) du tube (6). En outre, les parois latérales (12, 12') du diffuseur, qui sont dirigées vers les bords étroits du moule fin, forment chacune avec l'axe vertical un angle alpha </= 7,5 DEG en évasement vers le bas, la cloison centrale de séparation (14) se rétrécissant dans sa partie inférieure pour former avec l'axe vertical deux angles beta </= 7,5 DEG .

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