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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 9222155 B1

PDFFull Text
Date of Patent:
Dec. 29, 2015

Filed:

May. 30, 2011

Method for manufacturing high strength hot-rolled steel sheet having excellent stretch flangeability and fatigue resistance

Applicants:

Nobuyuki Nakamura, Tokyo, JP;

Hayato Saito, Tokyo, JP;

Katsumi Nakajima, Tokyo, JP;

Yoshimasa Funakawa, Tokyo, JP;

Noriaki Moriyasu, Tokyo, JP;

Takayuki Murata, Tokyo, JP;

Inventors:

Nobuyuki Nakamura, Tokyo, JP;

Hayato Saito, Tokyo, JP;

Katsumi Nakajima, Tokyo, JP;

Yoshimasa Funakawa, Tokyo, JP;

Noriaki Moriyasu, Tokyo, JP;

Takayuki Murata, Tokyo, JP;

Assignee:

JFE Steel Corporation, , JP;

Attorney:

DLA Piper LLP (US)

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/02 (2006.01); C21D 9/46 (2006.01); C22C 38/28 (2006.01); C22C 38/06 (2006.01); C21D 8/02 (2006.01); C22C 38/14 (2006.01); C21D 8/04 (2006.01); C22C 38/00 (2006.01); C22C 38/58 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C22C 38/60 (2006.01);
U.S. Cl.
CPC ...
C22C 38/14 (2013.01); C21D 8/0226 (2013.01); C21D 8/0463 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/16 (2013.01); C22C 38/28 (2013.01); C22C 38/58 (2013.01); C22C 38/60 (2013.01); C21D 2211/002 (2013.01); C21D 2211/004 (2013.01);
Abstract

A high strength hot-rolled steel sheet has a tensile strength of not less than 780 MPa and exhibits excellent stretch flangeability and excellent fatigue resistance. A steel has a composition containing C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.005%, Ti at 0.05 to 0.15%, Al at 0.005 to 0.10% and N at not more than 0.007%.

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