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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 11591665 B1

PDFFull Text
Date of Patent:
Feb. 28, 2023

Filed:

Dec. 18, 2018

Steel sheet having excellent toughness, ductility and strength, and manufacturing method thereof

Applicant:

Arcelormittal, Luxembourg, LU;

Inventors:

Coralie Jung, Racrange, FR;

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

Kangying Zhu, Metz, FR;

Frédéric Kegel, Yutz, FR;

Assignee:

ARCELORMITTAL, Luxembourg, LU;

Attorney:

Davidson, Davidson & Kappel, LLC

Primary Examiner:

Anthony M Liang

Assistant Examiner:

Danny N Kang

Int. Cl.
CPC ...
C01D 9/00 (2006.01); C21D 8/00 (2006.01); C22C 38/00 (2006.01); C23C 2/12 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/32 (2006.01); C23C 2/06 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (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 38/32 (2013.01); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C21D 2211/001 (2013.01); C21D 2211/003 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

A cold-rolled and heat treated steel sheet, has a composition comprising 0.1%≤C≤0.4%, 3.5%≤Mn≤8.0%, 0.1%≤Si≤1.5%, Al≤3%, Mo≤0.5%, Cr≤1%, Nb≤0.1%, Ti≤0.1%, V≤0.2%, B≤0.004%, 0.002%≤N≤0.013%, S≤0.003%, P≤0.015%. The structure consists of, in surface fraction: between 8 and 50% of retained austenite, at most 80% of intercritical ferrite, the ferrite grains, if any, having an average size of at most 1.5 μm, and at most 1% of cementite, the cementite particles having an average size lower than 50 nm, martensite and/or bainite.

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