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:
Mar. 24, 2026
Filed:
Oct. 14, 2022
Jfe Steel Corporation, Tokyo, JP;
Katsuya Hata, Tokyo, JP;
Shotaro Terashima, Tokyo, JP;
Tatsuya Nakagaito, Tokyo, JP;
Seisuke Tsuda, Tokyo, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
A steel sheet having high strength, excellent ductility, high YR, and excellent bendability. The steel sheet includes a defined chemical composition, the steel microstructure includes: area ratio of ferrite: 5% or more and 65% or less, area ratio of martensite: 10% or more and 60% or less, area ratio of bainite: 10% or more and 60% or less, and area ratio of retained austenite: 5% or more. The relationship in the following Formula (1) is satisfied. Average solute C concentration of the retained austenite [C]is 0.5 mass % or more, and standard deviation of C concentration distribution in the retained austenite is 0.250 mass % or less.