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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 9546413 B1

PDFFull Text
Date of Patent:
Jan. 17, 2017

Filed:

Mar. 28, 2012

Hot-rolled steel sheet and production method thereof

Applicants:

Takayuki Nozaki, Tokyo, JP;

Manabu Takahashi, Tokyo, JP;

Nobuhiro Fujita, Tokyo, JP;

Hiroshi Yoshida, Tokyo, JP;

Shinichiro Watanabe, Tokyo, JP;

Takeshi Yamamoto, Tokyo, JP;

Chisato Wakabayashi, Tokyo, JP;

Riki Okamoto, Tokyo, JP;

Kohichi Sano, Tokyo, JP;

Inventors:

Takayuki Nozaki, Tokyo, JP;

Manabu Takahashi, Tokyo, JP;

Nobuhiro Fujita, Tokyo, JP;

Hiroshi Yoshida, Tokyo, JP;

Shinichiro Watanabe, Tokyo, JP;

Takeshi Yamamoto, Tokyo, JP;

Chisato Wakabayashi, Tokyo, JP;

Riki Okamoto, Tokyo, JP;

Kohichi Sano, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Roy King

Assistant Examiner:

Caitlin Kiechle

Int. Cl.
CPC ...
C22C 38/26 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/08 (2006.01); C22C 38/10 (2006.01); C22C 38/16 (2006.01); C22C 38/28 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C21D 9/46 (2006.01); B32B 15/01 (2006.01); C22C 38/60 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C21D 8/04 (2006.01);
U.S. Cl.
CPC ...
C22C 38/26 (2013.01); B32B 15/013 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C21D 8/0463 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/10 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/28 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C22C 38/60 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C21D 2201/05 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01);
Abstract

Disclosed is a hot-rolled steel sheet including, by mass %, C:0.02% to 0.5% of C, and the sum of the content of Si and the content of Al is 1.0% to 4.0%. An average pole density of an orientation group from {100}<011> to {223}<110> is 1.0 to 6.5, and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0. A microstructure includes, by of an area ratio, 2% to 30% of retained austenite, 20% to 50% of ferrite, and 10% to 60% of bainite. rC that is a Lankford value in a direction orthogonal to a rolling direction is 0.70 to 1.10, and r30 that is a Lankford value in a direction forming an angle of 30° with the rolling direction is 0.70 to 1.10.

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