logo

For the Inventor, By the Inventor

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 9873931 B1

PDFFull Text
Date of Patent:
Jan. 23, 2018

Filed:

Nov. 25, 2014

Method of producing austenitic iron/carbon/manganese steel sheets having a high strength and excellent toughness and being suitable for cold forming, and sheets thus produced

Applicant:

Arcelormittal, Luxembourg, LU;

Inventors:

Mohamed Bouzekri, Rombas, FR;

Michel Faral, Metz, FR;

Colin Scott, Montigny les Metz, FR;

Assignee:

ArcelorMittal, Luxembourg, LU;

Attorneys:

Davidson, Davidson & Kappel, LLC

Jennifer L. O'Connell

William C. Gehris

Primary Examiner:

Scott Kastler

Assistant Examiner:

Vanessa T Luk

Int. Cl.
CPC ...
C22C 38/04 (2006.01); C22C 38/58 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); H01M 4/86 (2006.01); H01M 4/88 (2006.01); H01M 4/90 (2006.01); H01M 4/92 (2006.01); H01M 8/0232 (2016.01); B21B 3/02 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); H01M 8/1004 (2016.01);
U.S. Cl.
CPC ...
C22C 38/58 (2013.01); B21B 3/02 (2013.01); C21D 8/0205 (2013.01); C21D 8/0273 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); H01M 4/8605 (2013.01); H01M 4/8807 (2013.01); H01M 4/8817 (2013.01); H01M 4/8853 (2013.01); H01M 4/8892 (2013.01); H01M 4/9075 (2013.01); H01M 4/925 (2013.01); H01M 8/0232 (2013.01); C21D 8/0226 (2013.01); H01M 8/1004 (2013.01); Y02E 60/50 (2013.01); Y02P 70/56 (2015.11);
Abstract

A hot-rolled austenitic iron/carbon/manganese steel sheet is provided. The strength of which is greater than 900 MPa, the product (strength (in MPa)×elongation at fracture (in %)) of which is greater than 45000 and the chemical composition of which includes, the contents being expressed by weight 0.5%≦C≦0.7%, 17%≦Mn≦24%, Si≦3%, Al≦0.050%, S≦0.030%, P≦0.080% and N≦0.1%. A remainder of the composition includes iron and inevitable impurities resulting from the smelting. A recrystallized fraction of the structure of the steel is greater than 75%, a surface fraction of precipitated carbides of the steel is less than 1.5% and a mean grain size of the steel is less than 18 microns. A reinforcing element is also provided.

Find Patent Forward Citations

Loading…