Alloys of Fe, Cr, Si, Y and Al
US4230489A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1979 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Apr 13, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/34
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Certain alloys of iron, chromium, aluminium and yttrium are known e.g. from U.S. Pat. No. 3,027,252 and from U.K. Pat. No. 1,045,993 and are stated to be high temperature, oxidation resistant alloys. The invention relates to alloys of iron, chromium, aluminium and yttrium containing additionally certain proportions of silicon. Thus, the alloys of the invention comprise from 15 to 25% Cr, 4 to 5.5% Al, 0.01 to 3% Y, 0.3 to 5% Si and the balance Fe, where all proportions are by weight. The corrosion resistance of the alloys increases as the percentage of Si increases to reach a peak at about 1% Si. The preferred range of Si is 0.5 to 2%. All proportions are by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.