Method and installation for hot dip coating metal strips

Details Method and installation for hot dip coating metal strips Method and installation for hot dip coating metal strips

C - Chemistry, Metallurgy

23

C

C23C 2/02 (2006.01) C23C 2/40 (2006.01)

Patent

CA 2401746

The invention relates to a method for hot dip coating metal strips, especially hot-rolled steel strip, in which the metal strip is first transformed into an continuous strip in an unwinding station with an adjoining welding machine. The continuous strip is then subjected to a downstream modifying process which comprises a primary pickle and a secondary pickle; and in a final treatment stage in the hot dip coating part, guiding the continuous strip through a melt bath. According to the inventive method, the continuous strip is transported directly into a pickle in a first treatment step. This results in a less complex, variable coating process. In an installation which is suitable for carrying out the inventive method, the primary pickle in situated in the run- in part and is separated from the hot dip coating part by run-in reservoirs.

L'invention concerne un procédé de revêtement par trempé de bandes métalliques, notamment d'une bande d'acier laminée à chaud. Selon ce procédé, la bande métallique est d'abord transformée en une bande continue dans une station débitrice dotée d'une machine à souder adjacente. Ensuite, la bande continue est soumise à un procédé d'affinage aval comportant un décapage principal et un décapage ultérieur. Enfin, la bande continue traverse un bain de fusion dans l'élément de revêtement par trempé. Pour obtenir un procédé de revêtement plus varié à faible coût, la bande continue est amenée, dans un premier temps, directement dans un agent corrosif. Dans une installation appropriée à l'application de ce procédé, le décapage principal est effectué dans l'élément d'entrée et découplé de l'élément de revêtement par trempé par le réservoir d'entrée.

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