Dispersion strengthened ferritic stainless steel
US4464207A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1978 |
| Grant date | Aug 7, 1984 |
| Priority date | — |
| Expiry date | Aug 14, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Through-nitrided light gage ferritic stainless steels having a dispersion of metal-nitride particles at an interparticle spacing of less than about 10 microns. The resulting material has substantially improved strength at room and elevated temperatures over conventional ferritic stainless steels, exhibits ductility markedly above that commonly associated with nitrided articles, and is stronger than conventional 18Cr-8Ni austenitic stainless steel (T-304) for prolonged service above about 1400.degree. F. The nitriding is accomplished with atomic nitrogen at 1500.degree.-1800.degree. F. followed by heating to above 1800.degree. F. in a non-oxidizing atmosphere to remove excess nitrides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.