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:
Jan. 07, 2020
Filed:
Feb. 08, 2016
Kobe Steel, Ltd., Kobe-shi, JP;
Kosuke Shibata, Hyogo, JP;
Toshiya Nakata, Hyogo, JP;
Toshio Murakami, Hyogo, JP;
Takahiro Ozawa, Hyogo, JP;
Fumio Yuse, Hyogo, JP;
Atsuhiro Shiraki, Hyogo, JP;
Kenji Saito, Hyogo, JP;
Yukihiro Utsumi, Hyogo, JP;
KOBE STEEL, LTD., Kobe-shi, JP;
Abstract
Provided is an ultra-high-strength steel sheet having a component composition that includes specific amounts of each of C, Mn, and Al and a remainder of iron and unavoidable impurities, and in which the amounts of each of P, S, and N among the unavoidable impurities are limited to a specific amount. The ultra-high-strength steel sheet includes 2 area% or more of a region having a structure that includes 90% or more of martensite and 0.5% or more of residual austentite by area ratio relative to the entire structure, the local Mn concentration in said region being at least 1.1 times that of the Mn content of the entire steel sheet. The ultra-high-strength steel sheet has a tensile strength of 1470 MPa or more.