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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 11519061 B1

PDFFull Text
Date of Patent:
Dec. 06, 2022

Filed:

Aug. 31, 2015

Steel sheet

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Riki Okamoto, Tokyo, JP;

Hiroyuki Kawata, Tokyo, JP;

Masafumi Azuma, Tokyo, JP;

Akihiro Uenishi, Tokyo, JP;

Naoki Maruyama, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Anthony J Zimmer

Assistant Examiner:

Sean P O'Keefe

Int. Cl.
CPC ...
C22C 38/58 (2006.01); C22C 38/12 (2006.01); C21D 8/12 (2006.01); C22C 38/08 (2006.01); C22C 38/04 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C23C 2/28 (2006.01); C21D 8/00 (2006.01); C23C 2/06 (2006.01); C25D 7/06 (2006.01); C25D 5/36 (2006.01); C25D 5/48 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01);
U.S. Cl.
CPC ...
C22C 38/58 (2013.01); C21D 8/005 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1261 (2013.01); C21D 9/46 (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 38/34 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C25D 5/36 (2013.01); C25D 5/48 (2013.01); C25D 7/0614 (2013.01); C21D 2201/05 (2013.01); C21D 2211/001 (2013.01); C21D 2211/002 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

A steel sheet includes: a predetermined chemical composition; and a steel structure represented by, in area %, first martensite in which two or more iron carbides each having a circle-equivalent diameter of 2 nm to 500 nm are contained in each lath: 20% to 95%, ferrite: 15% or less, retained austenite: 15% or less, and the balance: bainite, or second martensite in which less than two iron carbides each having a circle-equivalent diameter of 2 nm to 500 nm are contained in each lath, or the both of these, in which the total area fraction of ND//<111> orientation grains and ND//<100> orientation grains is 40% or less, and the content of solid-solution C is 0.44 ppm or more.

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