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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 11384409 B1

PDFFull Text
Date of Patent:
Jul. 12, 2022

Filed:

Feb. 06, 2019

High-strength steel sheet, high-strength galvanized steel sheet, method for producing high-strength steel sheet, and method for producing high-strength galvanized steel sheet

Applicant:

Kobe Steel, Ltd., Kobe, JP;

Inventors:

Muneaki Ikeda, Kakogawa, JP;

Kenji Saito, Kakogawa, JP;

Assignee:

Kobe Steel, Ltd., Kobe, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C23C 2/06 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C23C 2/02 (2006.01); C21D 6/00 (2006.01); B32B 15/04 (2006.01); B32B 15/18 (2006.01); C23C 30/00 (2006.01); C23C 2/26 (2006.01); B32B 15/01 (2006.01); C23C 2/40 (2006.01); C23C 2/28 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B32B 15/01 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 6/00 (2013.01); C21D 6/001 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (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 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/26 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12972 (2015.01);
Abstract

The present invention relates to a high-strength steel sheet which satisfies a specific chemical component composition, and which is configured such that: when the metal structure thereof is observed with a scanning electron microscope, polygonal ferrite is 30 to 60% by area; when the metal structure thereof is observed with an optical microscope, MA mixed structure is 21% by area or less; when the metal structure thereof is measured by an X-ray diffraction method, retained austenite is 8% by volume or more; an area ratio of polygonal ferrite having a circle equivalent diameter of 35.0 μm or more is 0% and an area ratio of polygonal ferrite having a circle equivalent diameter of 10.0 μm or more and less than 35.0 μm is 10% or less in the polygonal ferrite; and connectivity as defined by a specific relational expression is 10% or more.

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