Secondary-hardening gear steel
US8801872B2 · kind B2 · utility
23Cited by
13References
8Claims
0Family size
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Key dates
| Filing date | Aug 20, 2008 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | Aug 20, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A case hardened gear steel having enhanced core fracture toughness includes by weight percent about 16.3Co, 7.5Ni, 3.5Cr, 1.75Mo, 0.2W, 0.11C, 0.03Ti, and 0.02V and the balance Fe, characterized as a predominantly lath martensitic microstructure essentially free of topologically close-packed (TCP) phases and carburized to include fine M2C carbides to provide a case hardness of at least about 62 HRC and a core toughness of at least about 50 ksi√in.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.