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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 10697039 B1

PDFFull Text
Date of Patent:
Jun. 30, 2020

Filed:

Aug. 28, 2015

High-strength steel sheet and method for manufacturing the same

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Nobusuke Kariya, Fukuyama, JP;

Yoshihiko Ono, Fukuyama, JP;

Yoshimasa Funakawa, Chiba, JP;

Kazuma Mori, Chiba, JP;

Reiko Sugihara, Chiba, JP;

Kenji Kawamura, Fukuyama, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

John A Hevey

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/06 (2006.01); C22C 38/40 (2006.01); C22C 38/12 (2006.01); C22C 38/04 (2006.01); C22C 38/50 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01); B21B 3/00 (2006.01); C22C 38/58 (2006.01); C22C 38/14 (2006.01); C22C 38/60 (2006.01); B21B 1/22 (2006.01); B21B 3/02 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/08 (2006.01); C22C 38/16 (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 38/38 (2006.01); C23G 1/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21B 1/22 (2013.01); B21B 3/00 (2013.01); B21B 3/02 (2013.01); C21D 6/001 (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 8/0263 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (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 38/38 (2013.01); C22C 38/40 (2013.01); C22C 38/50 (2013.01); C22C 38/58 (2013.01); C22C 38/60 (2013.01); C23G 1/00 (2013.01); B21B 2001/221 (2013.01); B21B 2001/225 (2013.01); C21D 2211/002 (2013.01); C21D 2211/003 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, and a tensile strength is 1180 MPa or more.

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