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. 23, 2025
Filed:
Apr. 15, 2021
Nippon Steel Corporation, Tokyo, JP;
Yukiko Kobayashi, Tokyo, JP;
Jun Takahashi, Tokyo, JP;
Tatsuo Yokoi, Tokyo, JP;
Riki Okamoto, Tokyo, JP;
Takeshi Toyoda, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A high-strength hot-rolled steel sheet: having a predetermined chemical composition; having a mean dislocation density of from 1×10to 1×10m, and containing at least bainitic ferrite, in which a total area ratio of the bainitic ferrite and ferrite is 70% or more and less than 90%, and in which a total area ratio of martensite and retained austenite is 5% or more and 30% or less, in which, in ferrite crystal grains and in bainitic ferrite crystal grains, a mean number density of TiC precipitates is from 1×10to 5×10[precipitates/cm], in which an amount of Ti present as a TiC precipitate precipitated in a matrix not on dislocations is 30 mass % or more of a total amount of Ti in the steel sheet, and in which a tensile strength is 850 MPa or more.