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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 9068238 B1

PDFFull Text
Date of Patent:
Jun. 30, 2015

Filed:

Mar. 30, 2011

High tensile strength hot rolled steel sheet having excellent formability and method for manufacturing the same

Applicants:

Tamako Ariga, Tokyo, JP;

Katsumi Nakajima, Tokyo, JP;

Tetsuya Mega, Tokyo, JP;

Inventors:

Tamako Ariga, Tokyo, JP;

Katsumi Nakajima, Tokyo, JP;

Tetsuya Mega, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Young & Thompson

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/14 (2006.01); C22C 38/12 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01); C21D 9/48 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/24 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01);
U.S. Cl.
CPC ...
C21D 8/0226 (2013.01); C21D 8/0426 (2013.01); C21D 8/0463 (2013.01); C21D 9/48 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/24 (2013.01); C22C 38/28 (2013.01); C22C 38/38 (2013.01);
Abstract

Described is a high tensile strength hot rolled steel sheet having high strength and formability, and a manufacturing method. It has tensile strength ≧980 MPa and excellent formability, and specifically identified ranges by mass % of C, Si, Mn, P, S, N, Al, Ti, V, Solute V, and Solute Ti; (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter <10 nm, as well as volume ratio with respect to the entire microstructure ≧0.007; and matrix as ferrite phase having area ratio with respect to the entire microstructure ≧97%. C, Ti, V, S and N satisfy (1) Ti≧0.08 +(N/14×48+S/32×48) and (2) 0.8≦(Ti/48+V/51)/(C/12)≦1.2, where 'C', 'Ti', “V”, “S” and “N” represent contents (mass %) of corresponding elements, respectively.

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