Invention Grant
- Patent Title: Bearing steel
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Application No.: US13820865Application Date: 2011-07-25
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Publication No.: US09598752B2Publication Date: 2017-03-21
- Inventor: Masaki Kaizuka , Mutsuhisa Nagahama
- Applicant: Masaki Kaizuka , Mutsuhisa Nagahama
- Applicant Address: JP Kobe-shi
- Assignee: Kobe Steel, Ltd.
- Current Assignee: Kobe Steel, Ltd.
- Current Assignee Address: JP Kobe-shi
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2010-207163 20100915
- International Application: PCT/JP2011/066847 WO 20110725
- International Announcement: WO2012/035884 WO 20120322
- Main IPC: C22C38/60
- IPC: C22C38/60 ; C21D1/32 ; C21D9/40 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/28 ; F16C33/62 ; C22C38/20 ; C22C38/24 ; C22C38/26 ; C22C38/44 ; C22C38/50

Abstract:
Provided is a bearing steel capable of exhibiting excellent cold workability in cold working that follows spheroidizing annealing and also capable of ensuring excellent abrasion resistance and rolling fatigue characteristics as a bearing member or the like. The bearing steel contains C: 0.9 to 1.10%, Si: 0.05 to 0.49%, Mn: 0.1 to 1.0%, P: not more than 0.05% (excluding 0%), S: not more than 0.05% (excluding 0%), Cr: 0.03 to 0.40%, Al: not more than 0.05% (excluding 0%), N: 0.002 to 0.025%, Ti: not more than 0.0030% (excluding 0%), and O: not more than 0.0025% (excluding 0%), with the remainder being iron and unavoidable impurities. The average aspect ratio of cementite is not more than 2.00, the average circle-equivalent diameter of cementite is 0.35 to 0.6 μm, and the number density of cementite having a circle-equivalent diameter of not less than 0.13 μm is not less than 0.45/μm2.
Public/Granted literature
- US20130183191A1 BEARING STEEL Public/Granted day:2013-07-18
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