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:
Sep. 08, 2020
Filed:
Mar. 25, 2016
Jfe Steel Corporation, Chiyoda-ku, Tokyo, JP;
Junji Shimamura, Tokyo, JP;
Nobuyuki Ishikawa, Tokyo, JP;
Shigeru Endo, Tokyo, JP;
Shusaku Ota, Tokyo, JP;
JFE STEEL CORPORATION, Chiyoda-ku, Tokyo, JP;
Abstract
Disclosed is, as a high-strength steel plate of API X80 grade or higher with a thickness of 38 mm or more, a thick steel plate for structural pipes or tubes that exhibits high strength in the rolling direction, excellent Charpy properties at its mid-thickness part, and high material homogeneity without addition of large amounts of alloying elements. The thick steel plate for structural pipes or tubes disclosed herein has: a specific chemical composition; a microstructure mainly composed of bainite; a tensile strength of 620 MPa or more; a Charpy absorption energy vEat −20° C. at the mid-thickness part of 100 J or more; a variation of Vickers hardness in a plate thickness direction ΔHVof 50 or less; and a variation of Vickers hardness in a plate widthwise direction ΔHVof 50 or less.