Invention Grant
- Patent Title: Method of producing roughly shaped material for rolling bearing
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Application No.: US15029449Application Date: 2014-10-27
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Publication No.: US10144984B2Publication Date: 2018-12-04
- Inventor: Takefumi Yano , Shinichirou Kashiwagi , Hiroki Uekita , Toshikazu Saitou , Tetsurou Hirano , Yutaka Neishi
- Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2013-231292 20131107
- International Application: PCT/JP2014/078471 WO 20141027
- International Announcement: WO2015/068601 WO 20150514
- Main IPC: C21D9/40
- IPC: C21D9/40 ; F16C19/36 ; B21K1/04 ; C21D8/00 ; C22C38/00 ; C22C38/18 ; C22C38/40 ; F16C33/62 ; F16C33/64 ; C22C38/02 ; C22C38/04 ; C21D7/13 ; C21D1/32

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 (Ae1 point+25° C.) to (Ae1 point+105° C.), cooling a forged article to a temperature of Ae1 point or lower, and performing an annealing in which the forged article that is obtained is heated to a soaking temperature in a range of (Ae1 point+25° C.) to (Ae1 point+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.
Public/Granted literature
- US20160265077A1 METHOD OF PRODUCING ROUGHLY SHAPED MATERIAL FOR ROLLING BEARING Public/Granted day:2016-09-15
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