Bearing steel material with excellent rolling contact fatigue properties and a bearing part
US9394593B2 · kind B2 · utility
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Key dates
| Filing date | Mar 5, 2012 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | Aug 24, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Bearing steel material according to the present invention has: a properly adjusted chemical composition; an average chemical composition of oxide-inclusions which comprises 10 to 45% of CaO, 20 to 45% of Al2O3, 30 to 50% of SiO2, up to 15% (exclusive of 0) of MnO, and 3 to 10% of MgO, with the balance being unavoidable impurities; a maximum major axis diameter of the oxide inclusions in a longitudinal section of the steel material of 20 μm or less; and a spheroidal cementite structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.