Continuous hot-dip coating method and apparatus therefor

C - Chemistry – Metallurgy – 23 – C

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C23C 2/40 (2006.01) C23C 2/02 (2006.01) B05C 3/12 (2006.01)

Patent

CA 2230369

A method for hot-dip coating a steel strip comprises: (a) continuously annealing the steel strip in an annealing furnace; (b) introducing the annealed steel strip into a molten metal coating bath through a snout; (c) dipping the annealed steel strip into the molten metal coating bath; (d) controlling a pressure inside of the snout; and (e) discharging a gas containing a metal vapor from the snout to outside of the snout. An apparatus comprises an annealing furnace, a coating pot, a control device for controlling a pressure inside the snout and a gas discharging device.

Méthode de revêtement par immersion à chaud. Elle consiste : a) à effectuer le recuit en continu de la bande d'acier dans un four de recuit; b) à introduire la bande d'acier traitée par recuit dans un bain de revêtement métallique liquide par une busette de coulée; c) à tremper la bande d'acier traitée par recuit dans le bain de revêtement métallique liquide; d) à maintenir une pression à l'intérieur de la busette de coulée; et e) à évacuer un gaz renfermant une vapeur métallique de la busette de coulée vers l'extérieur de celle-ci. Le dispositif comprend un four de recuit, un bain de revêtement, un dispositif de commande pour maintenir une pression dans la busette de coulée et dispositif d'évacuation du gaz.

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