C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/118, 32/80
C23C 2/06 (2006.01)
Patent
CA 1126102
METHOD AND APPARATUS FOR CONTINUOUSLY HOT-DIP GALVANIZING STEEL STRIP ABSTRACT OF THE DISCLOSURE A method and an apparatus for continuously hot-dip galvanizing a steel strip, which comprises: using a hot-dip galvanizing tank divided into a reaction chamber and a plating chamber having a bottom wall downwardly inclining toward the bottom wall of said reaction chamber, by a vertical partition provided, at the lowermost end thereof, with a gap and, at the upper end portion thereof, with an aperture of which the opening can be adjusted, said reaction chamber and said plating chamber communicating with each other through said gap and said aperture; causing a hot-dip galvanizing bath containing aluminum in a prescribed amount, contained in said hot-dip galvanizing tank, to circu- late by convection, under the effect of stirring by a stirring means provided in said reaction chamber, through said gap and said aperture, between said reaction chamber and said plating chamber; continuously introducing a steel strip into said hot-dip galvanizing bath in said plating chamber while con- tinuing said stirring, to subject said steel strip to a hot- dip galvanizing treatment; adjusting the thickness of a galvanized layer formed on the surface of said steel strip - 1 - directly above the surface of said hot-dip galvanizing bath to manufacture a hot-dip galvanized steel strip; on the other hand, causing a bottom dross (FeZn7) produced during said hot-dip galvanizing treatment and accumulated on the bottom of said plating chamber, to flow down along the slant bottom wall of said plating chamber to the bottom of said reaction chamber; causing said bottom dross to actively react with aluminum contained in said hot-dip galvanizing bath in said reaction chamber under the effect of said stirring by said stirring means,to convert said bottom dross into a sur- face dross (Fe2Al5); and, substantially removing said surface dross floating on the surface of said hot-dip galvanizing bath in said reaction chamber, from said reaction chamber, during said hot-dip galvanizing treatment. - 2 -
346633
Gunji Naoki
Ito Saburo
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
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