Method for the hot-dip coating of a flat steel product containing 2-35 wt.% of Mn, and a flat steel product
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United States of America Patent
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Apr 4, 2017
Grant Date -
May 24, 2012
app pub date -
Apr 22, 2010
filing date -
Apr 23, 2009
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Abstract
A method by which a flat steel product containing 2-35 wt. % of Mn can be provided with a coating of Zn which adheres well by annealing at an annealing temperature Ta of 600-1100° C. for an annealing time of 10-240 s under an annealing atmosphere which has a reducing effect on the FeO present on the flat steel product and an oxidizing effect on the Mn contained in the steel substrate thereby forming a layer of Mn mixed oxide which covers the flat steel product at least in sections and then cooling the flat steel product to a temperature for bath entry and conveying it through a bath of molten Zn saturated within iron at a temperature of 420-520° C., within a dip time of 0.1-10 s.
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