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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 9988700 B1

PDFFull Text
Date of Patent:
Jun. 05, 2018

Filed:

Jul. 27, 2012

High-strength steel sheet and high-strength galvanized steel sheet excellent in shape fixability, and manufacturing method thereof

Applicants:

Akinobu Minami, Tokyo, JP;

Hiroyuki Kawata, Tokyo, JP;

Akinobu Murasato, Tokyo, JP;

Yuji Yamaguchi, Tokyo, JP;

Natsuko Sugiura, Tokyo, JP;

Takuya Kuwayama, Tokyo, JP;

Naoki Maruyama, Tokyo, JP;

Takamasa Suzuki, Tokyo, JP;

Inventors:

Akinobu Minami, Tokyo, JP;

Hiroyuki Kawata, Tokyo, JP;

Akinobu Murasato, Tokyo, JP;

Yuji Yamaguchi, Tokyo, JP;

Natsuko Sugiura, Tokyo, JP;

Takuya Kuwayama, Tokyo, JP;

Naoki Maruyama, Tokyo, JP;

Takamasa Suzuki, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Keith Walker

Assistant Examiner:

Stephani Hill

Int. Cl.
CPC ...
C23C 2/02 (2006.01); C22C 38/38 (2006.01); C22C 38/34 (2006.01); C22C 38/26 (2006.01); C22C 38/16 (2006.01); C22C 38/00 (2006.01); C22C 38/12 (2006.01); C22C 38/08 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/14 (2006.01); C21D 8/02 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C21D 9/46 (2006.01); C21D 1/19 (2006.01); C25D 5/36 (2006.01); C25D 7/06 (2006.01); C25D 3/22 (2006.01);
U.S. Cl.
CPC ...
C23C 2/02 (2013.01); C21D 1/19 (2013.01); C21D 8/0205 (2013.01); C21D 8/0247 (2013.01); C21D 8/0263 (2013.01); C21D 9/46 (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 38/26 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C25D 5/36 (2013.01); C25D 7/0614 (2013.01); C21D 2211/001 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C25D 3/22 (2013.01); Y10T 428/12799 (2015.01);
Abstract

The present invention provides a high-strength steel sheet excellent in shape fixability. The high-strength steel sheet contains C, Si, Mn, P, S, Al, N, and O with predetermined contents, in which a retained austenite phase of 5 to 20% in volume fraction is contained, an amount of solid-solution C contained in the retained austenite phase is 0.80 to 1.00% in mass %, Wis 1.10 times or more W, Wis 1.10 times or more W, and when a frequency distribution is measured with respect to a sum of a ratio between Wand Wand a ratio between Wand W, a mode value of the frequency distribution is 1.95 to 2.05, and a kurtosis is 2.00 or more.

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