Method for the hardened galvanisation of a steel strip

C - Chemistry – Metallurgy – 23 – C

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C23C 2/00 (2006.01)

Patent

CA 2714472

The invention relates to a method for the hardened galvanisation of a continuously-running rolled steel strip, in which the strip is immersed in a coating tank containing a bath of a liquid metal mixture, e.g. zinc and aluminium, to be deposited on the strip, and permanently circulated between said coating tank and a preparation device, in which the temperature of the liquid mixture is deliberately lowered in order to reduce the iron solubility threshold and sufficiently high for initiating, in said preparation device, the fusion of at least one Zn-Al ingot in an amount necessary for compensating for the liquid mixture used for deposition on the strip. The device is implemented so that the circuit for circulating the liquid mixture is thermally optimised.

La présente invention décrit un procédé de galvanisation au trempé d'une bande d'acier laminé en défilement continu pour lequel la bande est immergée dans un bac de revêtement contenant un bain de mélange liquide de métal, tel que du zinc et de l'aluminium, à déposer sur la bande mis en circulation permanente entre ledit bac de revêtement et un dispositif de préparation dans lequel la température du mélange liquide est volontairement abaissée afin de diminuer un seuil de solubilité de fer et suffisamment élevée pour activer, dans le dit dispositif de préparation, une fusion d'au moins un lingot Zn-Al en quantité nécessaire pour compenser le mélange liquide consommé par dépôt sur la bande. Le dit procédé est mis en oeuvre de telle façon qu'un circuit de circulation du mélange liquide est thermiquement optimisé.

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