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. 15, 2026
Filed:
Apr. 11, 2022
Jfe Steel Corporation, Tokyo, JP;
Akihide Matsumoto, Tokyo, JP;
Shinsuke Ide, Tokyo, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
Provided are a high-strength hot rolled steel sheet and a high-strength electric resistance welded steel pipe and methods for producing the same. In the steel microstructure of the steel sheet at the thickness center of the steel sheet, the volume fractions of bainite and ferrite are specific values, the average grain size is 9.0 μm or less, and the dislocation density is 1.0×10mor more and 1.0×10mor less. In the steel microstructure at a position 0.1 mm below the surface, the volume fractions of bainite and ferrite are specific values, the average grain size is 9.0 μm or less, the dislocation density is 5.0×10mor more and 1.0×10mor less, and the maximum low angle grain boundary density is 1.4×10mor less. The thickness of the steel sheet is 15 mm or more.