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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 11530461 B1

PDFFull Text
Date of Patent:
Dec. 20, 2022

Filed:

Nov. 21, 2018

Cold rolled and annealed steel sheet and method of manufacturing the same

Applicant:

Arcelormittal, Luxembourg, LU;

Inventors:

Kangying Zhu, Metz, FR;

Astrid Perlade, Le Ban-Saint-Martin, FR;

Coralie Jung, Metz, FR;

Frederic Kegel, Yutz, FR;

Assignee:

ArcelorMittal, Luxembourg, LU;

Attorney:

Davidson, Davidson & Kappel, LLC

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); B23K 11/11 (2006.01); B23K 11/16 (2006.01); B32B 15/01 (2006.01); C22C 38/12 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C21D 1/25 (2006.01); C21D 9/48 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C23C 2/12 (2006.01); C21D 8/04 (2006.01); C22C 38/38 (2006.01); C22C 38/22 (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); C22C 38/18 (2006.01); C21D 1/34 (2006.01); C21D 1/26 (2006.01); B32B 15/04 (2006.01); B32B 15/18 (2006.01); C23C 2/26 (2006.01); C23C 2/40 (2006.01); C23C 30/00 (2006.01); B23K 101/00 (2006.01); C23C 2/06 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B23K 11/11 (2013.01); B23K 11/115 (2013.01); B23K 11/16 (2013.01); B23K 11/163 (2013.01); B23K 11/166 (2013.01); B32B 15/012 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 1/18 (2013.01); C21D 1/25 (2013.01); C21D 1/26 (2013.01); C21D 1/34 (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 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01); C21D 8/0436 (2013.01); C21D 8/0447 (2013.01); C21D 8/0473 (2013.01); C21D 9/48 (2013.01); C22C 38/001 (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 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/22 (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 38/38 (2013.01); C23C 2/12 (2013.01); C23C 2/26 (2013.01); C23C 2/40 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); B23K 2101/006 (2018.08); C21D 2211/001 (2013.01); C21D 2211/004 (2013.01); C21D 2211/008 (2013.01); C23C 2/06 (2013.01); Y10T 428/12757 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12972 (2015.01);
Abstract

A cold-rolled and heat-treated steel sheet having a microstructure consisting of, in surface fraction: between 10% and 30% of retained austenite, the retained austenite being present as films having an aspect ratio of at least 3 and as Martensite Austenite islands, less than 8% of the Martensite Austenite islands having a size above 0.5 μm, at most 1% of fresh martensite, at most 50% of tempered martensite, and recovered martensite containing precipitates of at least one element chosen among niobium, titanium and vanadium. A method for manufacturing the cold-rolled and heat-treated steel sheet is also described.

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