Ferritic stainless steel and process for producing such a steel
US5230752A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Sep 13, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process and combination for ferritic stainless steel resisting corrosion in neutral or weakly acid chloride-containing media, being ductile and impact resistant, the compositions consisting essentially of 28.5 to 35% chromium, 3.5 to 5.5% molybdenum, 0.5 to 2% copper, less than 0.5% nickel, less than 0.4% manganese, less than 0.4% silicon, less than 0.030% carbon, less than 0.030% nitrogen, and of titanium and/or niobium between 0.10 to 0.60% where % Ti>0.2+4(% C)+3.4(% N) and/or % Nb>0.1+7.7(% C)+6.6(% N) is satisfied. The process if for production of steel strips of the above composition where the hot-rolled steel strip is tempered at 900 to 1200.degree. C., then subjected to a first cold rolling followed by an intermediate and final tempering at 900 to 1200.degree. C. after intermediate and final cold rollings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.