Ultra-high strength steel having improved resistance to environmental stress corrosion cracking
US4019901A · kind A · utility
1Cited by
5References
2Claims
0Family size
Assignee
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Key dates
| Filing date | May 10, 1976 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | May 10, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C32/0026
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An ultra-high strength steel composition of matter having a substantially martensitic matrix with a dispersion therein of a critical amount of metal oxide particles and characterized by increased resistance to environmental stress corrosion cracking. The metal oxide particles are selected from the group consisting of CaO, BaO, MgO, SrO and mixtures thereof, in the range of 0.1 to less than 3 mole percent. A powder metallurgy process to produce articles of manufacture from the composition of matter is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.