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. 17, 2024
Filed:
Apr. 07, 2020
Sumitomo Electric Industries, Ltd., Osaka, JP;
Tetsuya Nakajima, Osaka, JP;
Fuminori Okada, Osaka, JP;
Kazuaki Sugimura, Osaka, JP;
Hiromu Izumida, Osaka, JP;
Katsutoshi Iwamoto, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A steel wire is formed of a steel containing: not less than 0.6 mass % and not more than 0.7 mass % carbon, not less than 1.2 mass % and not more than 2.1 mass % silicon, not less than 0.2 mass % and not more than 0.6 mass % manganese, not less than 1.4 mass % and not more than 2 mass % chromium, and not less than 0.15 mass % and not more than 0.3 mass % vanadium, with the balance being iron and unavoidable impurities. The steel includes a matrix made up of tempered martensite, and a non-metallic inclusion present in the matrix. When √area of the non-metallic inclusion is represented as Hand √area of a region including both the non-metallic inclusion and a decreased-hardness portion is represented as H, a ratio of Hto H, or, H/His at least 1 and less than 1.3.