Ferritic stainless steel strip or sheet, in particular for exhaust systems
US4726853A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Oct 27, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/28
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention concerns a strip or sheet of ferritic stainless steel of the following composition (% by weight): PA1 (C+N)<.060; PA1 Si<0.9; PA1 Mn<1; PA1 Cr=15 to 19; PA1 Mo<1; PA1 Ni<0.5; PA1 Ti<0.1; PA1 Cu<0.4; PA1 S<0.02; PA1 P<0.045; PA1 Zr=0.10 to 0.40, and 7(C+N).ltoreq.Zr.ltoreq.7(C+N)+0.15; PA1 Nb=0.25 to 0.55, in non-combined form; PA1 Al=0.020 to 0.080; PA1 Fe=the balance, in which Al is essentially in solid solution. The process for the production of the sheet or strip comprises a final annealing operation which is carried out at between 980.degree. and 1020.degree. C., typically for 0.5 to 5 minutes at between 990.degree. and 1010.degree. C. The strip or sheet according to the invention is used for any application requiring an economic compromise in regard to ductility (sheet and welds), hot resistance and resistance to corrosion, for example in motor vehicle exhaust manifolds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.