Method for the hot-dip coating of a flat steel product containing 2-35 wt.% of Mn, and a flat steel product

US9611527B2 · kind B2 · utility

Assignee

• ThyssenKrupp Steel Europe AG · DE

Inventors

• Manfred Meurer · Rheinberg, DE
• Martin Norden · Essen, DE
• Wilhelm Warnecke · Hamminkeln, DE
• Marc Blumenau · Hagen, DE
• Matthias Dahlem · Duisburg, DE
• Jennifer Schulz · Unna, DE
• Klaus Josef Peters · Krefeld, DE

Key dates

• Filing date: Apr 22, 2010
• Grant date: Apr 4, 2017
• Expiry date: Jun 12, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C2/026
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

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.