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.:
Date of Patent:
Dec. 05, 2017
Filed:
Mar. 10, 2014
Nippon Steel & Sumitomo Metal Corporation, Chiyoda-ku, Tokyo, JP;
Masaki Mizoguchi, Kimitsu, JP;
Kazutoshi Ichikawa, Kimitsu, JP;
Manabu Hoshino, Kimitsu, JP;
Kazuaki Mitsuyasu, Osaka, JP;
Hirokazu Sugiyama, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
An H-section steel has a predetermined chemical composition in which a thickness of a flange is 100 mm to 150 mm, at a strength evaluation position an area fraction of bainite in a steel structure is 80% or more, yield strength or 0.2% proof strength is 450 MPa or more, tensile strength is 550 MPa or more and 680 MPa or less, at a toughness evaluation position an average austenite grain size in the steel structure is 150 μm or less, and (Mg, Mn)S having a particle size of 0.005 μm to 0.5 μm is included at a density of 1.0×10pieces/mmto 1.0×10pieces/mm.