The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 2014
Filed:
Apr. 26, 2006
Ronny Leuschner, Dortmund, DE;
Manfred Meurer, Rheinberg, DE;
Wilhelm Warnecke, Hamminkeln, DE;
Sabine Zeizinger, Mülheim, DE;
Gernot Nothacker, Dortmund, DE;
Michael Ullmann, Bochum, DE;
Norbert Schaffrath, Hamm, DE;
Ronny Leuschner, Dortmund, DE;
Manfred Meurer, Rheinberg, DE;
Wilhelm Warnecke, Hamminkeln, DE;
Sabine Zeizinger, Mülheim, DE;
Gernot Nothacker, Dortmund, DE;
Michael Ullmann, Bochum, DE;
Norbert Schaffrath, Hamm, DE;
ThyssenKrupp Steel AG, Duisburg, DE;
Abstract
A method for coating a flat steel product manufactured from a high strength steel with a metallic coating, wherein the flat steel product is initially subjected to a heat treatment, in order then, in the heated state, to be hot-dip galvanized with the metallic coating in a melting bath containing overall at least 85% zinc and/or aluminum. The heat treatment includes heating the steel product in a reducing atmosphere, followed by converting a surface of the flat product to an iron oxide layer by a heat treatment lasting 1 to 10 secs in an oxidizing atmosphere, followed by annealing in a reducing atmosphere over a period of time which is longer than the duration of the formation of the iron oxide layer such that the iron oxide layer is reduced at least on its surface to pure iron, followed by cooling the product to a melting bath temperature.