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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 10730105 B1

PDFFull Text
Date of Patent:
Aug. 04, 2020

Filed:

Jan. 24, 2014

Method for producing a flat steel product with an amorphous, partially amorphous or fine-crystalline microstructure and flat steel product with such characteristics

Applicant:

Thyssenkrupp Steel Europe Ag, Duisburg, DE;

Inventors:

Dorothée Dorner, Dusseldorf, DE;

Christian Höckling, Duisburg, DE;

Harald Hofmann, Dortmund, DE;

Matthias Schirmer, Dusseldorf, DE;

Markus Daamen, Aachen, DE;

Assignee:

THYSSENKRUPP STEEL EUROPE AG, Duisburg, DE;

Attorney:

The Webb Law Firm

Primary Examiner:

Jenny R Wu

Int. Cl.
CPC ...
B22D 25/06 (2006.01); C22C 38/02 (2006.01); C22C 45/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/34 (2006.01); B22D 11/06 (2006.01); C21D 1/18 (2006.01); C22C 33/00 (2006.01); C22C 38/00 (2006.01); B22D 27/04 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 1/00 (2006.01);
U.S. Cl.
CPC ...
B22D 25/06 (2013.01); B22D 11/0611 (2013.01); B22D 11/0622 (2013.01); B22D 27/04 (2013.01); C21D 1/18 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/46 (2013.01); C22C 1/002 (2013.01); C22C 33/003 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/34 (2013.01); C22C 45/02 (2013.01); C21D 2201/03 (2013.01);
Abstract

A method is provided for producing a 0.8-4.5 mm thick steel strip with an amorphous, partially amorphous or fine-crystalline microstructure with grain sizes in the range of 10-10000 nm and also a flat steel product made therefrom. A molten steel is cast into a cast strip in a casting device and cooled down at an accelerated rate. Along with Fe and impurities that are unavoidable for production-related reasons, the molten material contains at least two elements belonging to the group 'Si, B, C and P'. In this case, the following applies for the contents of these elements (in % by weight) Si: 1.2-7.0%, B: 0.4-4.0%, C: 0.5-4.0%, P: 1.5-8.0%. With a corresponding composition and a microstructure with corresponding characteristics, a flat steel product according to the invention has a HV0.5 hardness of 760-900.

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