Ferritic stainless steel of use in particular for catalyst supports
US5866065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1996 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Mar 29, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ferritic stainless steel which resists oxidation at high temperature, of use in particular for a catalyst support structure, such as for example structures contained in the exhaust pipes of motor vehicles. This stainless steel comprises by weight: PA1 12 to 25% chromium, 4 to 7% aluminium, less than 0.03% carbon, less than 0.02% nitrogen, less than 0.22% nickel, less than 0.002% sulphur,less than 0.6% silicon, less than 0.4% manganese, PA1 the active elements selected from the group comprising cerium, lanthanum, neodymium, praseodymium, yttrium taken alone or in combination, at a content of lower than 0.08%, at least one stabilizing element selected from the group comprising zirconium and niobium, PA1 the zirconium and/or niobium contents satisfying the following conditions: PA1 for the zirconium, EQU (C%/12+N%/14)-0.1.ltoreq.Zr.ltoreq.91 (C%/12+N%/14)+0.1 PA2 for the niobium, EQU 93.times.0.8(C%/12)-0.1.ltoreq.Nb .ltoreq.93.times.0.8(C%/12)+0.15 and Nb<0.3%, PA2 for the zirconium and the niobium, EQU 91(N%/14)-0.05.ltoreq.Zr .ltoreq.91(N%/14)+0.05 and 93.times.0.8(C%/12)-0.05 .ltoreq.Nb.ltoreq.93.times.0.8(C%/12)+0.10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.