Cooling device for steel strip

C - Chemistry – Metallurgy – 21 – D

Patent

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Details

C21D 9/573 (2006.01) C21D 1/613 (2006.01) C21D 1/667 (2006.01)

Patent

CA 2500271

The present invention: enables the resistance coefficient of a nozzle to be decreased and a cooling device assembly to be downsized in a cooling device requiring a higher cooling rate; in particular, the invention is a cooling device for a steel strip, said cooling device being equipped with a plurality of nozzles protruding from the surfaces of a cooling chamber so as to keep the distance between the tips of said nozzles and the surfaces of said steel strip in the range from 30 to 100 mm and cooling said traveling steel strip by ejecting a cooling medium through said nozzles, characterized in that D/d of said blowing nozzles satisfies the expression 1.5 <= D/d <= 3.0 wherein d is the inner diameter at the tip of a nozzle (steel strip side) and D the inner diameter at the foot of a nozzle (cooling chamber side).

La présente invention permet de réduire le coefficient d'une buse et de diminuer la taille d'un ensemble dispositif de refroidissement dans un dispositif de refroidissement nécessitant une vitesse de refroidissement supérieure. Plus particulièrement, l'invention concerne un dispositif de refroidissement destiné à une bande d'acier, ce dispositif étant équipé d'une pluralité de buses faisant saillie sur les surfaces d'une chambre de refroidissement de sorte que la distance entre les pointes de ces buses et les surfaces de cette bande d'acier soit maintenue entre 30 et 100 mm, la bande d'acier en mouvement étant refroidie par éjection d'un milieu refroidissant par l'intermédiaire de ces buses. L'invention se caractérise en ce que le rapport D/d de ces buses de soufflage satisfait l'expression 1,5 <= D/d <= 3,0, d étant le diamètre intérieur à la pointe d'une buse (côté bande d'acier) et D étant le diamètre intérieur au pied d'une buse (côté chambre de refroidissement).

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