Heat- and creep-resistant steel having a martensitic microstructure produced by a heat-treatment process
US5415706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1994 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | May 6, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/52
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The heat- and creep-resistant steel has a martensitic microstructure produced by a heat-treatment process. The composition of the steel in percent by weight is as follows: PA1 0.001-0.05 of carbon PA1 0.05-0.5 of silicon PA1 0.05-2.0 of manganese PA1 0.05-2.0 of nickel PA1 8.0-13.0 of chromium PA1 0.05-1.0 of molybdenum PA1 1.00-4.0 of tungsten PA1 0.05-0.5 of vanadium PA1 0.01-0.2 of niobium PA1 2.0-6.5 of cobalt PA1 0.1-0.3 of nitrogen, the remainder being iron and unavoidable impurities. Such a steel can be produced by forging, casting or by powder-metallurgical means. Components fabricated from this steel show a high strength and ductility at room temperature and are distinguished at temperatures of 600.degree. C. and higher by a very high creep strength and an unusually high oxidation resistance. They can therefore be used with advantage as mechanically and thermally highly stressed components in steam- and/or gas-operated power stations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.