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:
Dec. 04, 2018
Filed:
Oct. 27, 2014
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Takefumi Yano, Itano-gun, JP;
Shinichirou Kashiwagi, Osaka, JP;
Hiroki Uekita, Lexington, KY (US);
Toshikazu Saitou, Osaka, JP;
Tetsurou Hirano, Osaka, JP;
Yutaka Neishi, Hokkaido, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A roughly shaped material for a rolling bearing of the present invention is produced by forging a steel composed of a high-carbon chrome bearing steel containing 0.7 mass % to 1.2 mass % of a carbon, and 0.8 mass % to 1.8 mass % of a chromium to a predetermined shape while heating the steel to a forging temperature in a range of (Aepoint+25° C.) to (Aepoint+105° C.), cooling a forged article to a temperature of Aepoint or lower, and performing an annealing in which the forged article that is obtained is heated to a soaking temperature in a range of (Aepoint+25° C.) to (Aepoint+85° C.), the forged article is retained for 0.5 hours or longer, and the forged article is cooled down to 700° C. or lower at a cooling rate of 0.30° C./s or slower.