Low cobalt-containing maraging steel with improved toughness
US4832909A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1988 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Jul 11, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/105
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A low cobalt maraging steel has a yield strength of at least about 240 ksi (about 1655 MPa) in the aged condition in combination with good toughness as indicated by a longitudinal Charpy V-notch impact toughness of at least aobut 20 ft-lb (about 27 J), as well as good notch ductility. The alloy contains, in weight percent, about: ______________________________________ w/o ______________________________________ C 0.02 Max. Ni 15-20 Mo 0.50-4.0 Co 0.5-5.0 Ti 0.90-1.35 Nb 0.03-0.35 Al 0.3 Max. B Up to 0.015 ______________________________________ The balance is essentially iron, optional additions, and the usual impurities found in commercial grades of high nickel, low carbon maraging steels. The alloy is further characterized in that the ratio %Co:%Mo is at least about 0.3 and %Ti+%Nb.gtoreq.1.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.