Bearing steel and ingot material for bearing having excellent rolling contact fatigue life characteristics and method for manufacturing the same
US9139887B2 · kind B2 · utility
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Key dates
| Filing date | May 24, 2011 |
| Grant date | Sep 22, 2015 |
| Priority date | — |
| Expiry date | May 24, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/44
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides bearing steel, comprising a chemical composition including by mass %, C: 0.56%≦[% C]≦0.70%, Si: 0.15%≦[% Si]<0.50%, Mn: 0.60%≦[% Mn]≦1.50%, Cr: 0.50%≦[% Cr]≦1.10%, Mo: 0.05%≦[% Mo]≦0.5%, P: [% P]≦0.025%, S: [% S]≦0.025%, Al: 0.005%≦[% Al]≦0.500%, O: [% O]≦0.0015%, N: 0.0030%≦[% N]≦0.015%, and remainder as Fe and incidental impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.