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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 9644372 B1

PDFFull Text
Date of Patent:
May. 09, 2017

Filed:

Dec. 12, 2012

High-strength h-beam steel exhibiting excellent low-temperature toughness and method of manufacturing same

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Kazutoshi Ichikawa, Tokyo, JP;

Teruyuki Wakatsuki, Tokyo, JP;

Noriaki Onodera, Tokyo, JP;

Kohichi Yamamoto, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Scott Kastler

Assistant Examiner:

Vanessa Luk

Int. Cl.
CPC ...
E04C 3/32 (2006.01); E04C 3/04 (2006.01); C22C 38/00 (2006.01); C22C 38/12 (2006.01); B21B 1/088 (2006.01); C22C 38/14 (2006.01); C22C 38/58 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C21D 8/02 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/16 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C21D 8/00 (2006.01);
U.S. Cl.
CPC ...
E04C 3/32 (2013.01); B21B 1/088 (2013.01); C21D 8/0205 (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 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C22C 38/58 (2013.01); C21D 8/00 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); E04C 2003/0404 (2013.01);
Abstract

This H-beam steel contains, in mass %, C, Si, Mn, Al, Ti, N, O, Nb, and B. The H-beam steel has composition in which the amount of Nb and the amount of B satisfy, in mass %, 0.070≦Nb+125B≦0.155, and has a metal structure in which, in a microstructure, an area fraction of bainite is not less than 70%, a total of an area fraction of pearlite and an area fraction of cementite is not more than 15%, and the remainder is at least one of ferrite and island martensite. The effective crystalline-grain size of the bainite is not more than 40 μm, and the thickness of a flange falls in a range of 12 to 40 mm.

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