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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.:

US 12252755 B1

PDFFull Text
Date of Patent:
Mar. 18, 2025

Filed:

Aug. 17, 2021

Process for manufacturing a flat steel product having an aluminum-based corrosion-resistant coating, and flat steel product having an aluminum-based corrosion-resistant coating

Applicant:

Thyssenkrupp Steel Europe Ag, Duisburg, DE;

Inventors:

Janko Banik, Altena, DE;

Dirk Rosenstock, Essen, DE;

Axel Ralf Schrooten, Dortmund, DE;

Assignee:

ThyssenKrupp Steel Europe AG, Duisburg, DE;

Attorney:

RMCK Law Group PLC

Primary Examiner:

Katherine A Christy

Int. Cl.
CPC ...
C22C 38/02 (2006.01); B32B 15/01 (2006.01); C21D 1/42 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C23C 2/12 (2006.01); C23C 2/28 (2006.01);
U.S. Cl.
CPC ...
C21D 9/0081 (2013.01); B32B 15/012 (2013.01); C21D 1/42 (2013.01); C21D 6/00 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0221 (2013.01); C21D 8/0247 (2013.01); C21D 8/0278 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C23C 2/12 (2013.01); C23C 2/28 (2013.01);
Abstract

A process for manufacturing a flat steel product having a prealloyed corrosion-resistant coating, comprises providing a coated flat steel product comprising a steel substrate having, at least on one side of the steel substrate, and an aluminum-based corrosion-resistant coating. The coated flat steel product is heat-treated, comprising the following substeps: Heating the coated flat steel product in a furnace at a furnace temperature T of between 950° C. and 1150° C. with a furnace dwell time tof between 40 seconds and 150 seconds, the furnace temperature being chosen such that the heating rate of the coated flat steel product in the temperature range from 500° C. to 700° C. is more than 10 K/s. The coated flat steel product is held at a temperature above Ac3 for a hold time of between 20 seconds and 60 seconds.

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