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:
Nov. 14, 2023
Filed:
Jul. 10, 2019
Applicant:
Proterial, Ltd., Tokyo, JP;
Inventor:
Hiroyoshi Fujihara, Tokyo, JP;
Assignee:
Proterial, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/573 (2006.01); C22C 38/22 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C21D 6/00 (2006.01); C21D 1/18 (2006.01);
U.S. Cl.
CPC ...
C21D 9/573 (2013.01); C21D 1/18 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C21D 2211/004 (2013.01); C21D 2211/008 (2013.01);
Abstract
A martensitic stainless steel strip capable of achieving higher fatigue strength. This martensitic stainless steel strip has a martensite structure and has a thickness of 1 mm or less, and is characterized in that the compressive residual stress at a surface of the steel strip is 50 MPa or more and the areal ratio of carbides present in the metal structure of the steel strip is 0.5-8.0%. The compressive residual stress at a surface of the steel strip is preferably such that the compressive residual stress in a direction perpendicular to rolling is at least 50 MPa greater than the compressive residual stress in the direction of rolling.