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:
Jun. 25, 2019
Filed:
Feb. 13, 2014
Kobe Steel, Ltd., Kobe-shi, JP;
Kosuke Shibata, Hyogo, JP;
Toshio Murakami, Hyogo, JP;
Elijah Kakiuchi, Hyogo, JP;
Katsura Kajihara, Hyogo, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
A high strength cold-rolled steel sheet has a component composition containing specific amounts of C, Si, Mn, P, S, N and Al, respectively with a remainder being iron and inevitable impurities. The steel sheet contains 95% or more of martensite in terms of area ratio, and contains 5% or less (inclusive of 0%) of residual austenite and ferrite in terms of a total area ratio. An average size of a carbide is 60 nm or less in terms of an equivalent circle diameter, and a number density of the carbide having the equivalent circle diameter of 25 nm or more is 5.0×10pieces or less per mm. The steel sheet has a yield strength of 1,180 MPa or more and a tensile strength of 1,470 MPa or more.