Method for cold rolling and annealing strip cast stainless steel strip
US5858135A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1997 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Jul 29, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/0205
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing strip cast, austenitic stainless steel strip comprises providing a strip cast strip having an initial microstructure including a detrimental amount of delta ferrite and a detrimental amount of dendritic structure is provided. The strip may have a composition comprising the following ingredients: 0.4 wt. % max. carbon, 5-38 wt. % nickel, and 15-28 wt. % chromium. The strip is subjected to a cold rolling step prior to any annealing step. Upon subsequent annealing, (a) the amount of delta ferrite in the strip is reduced to substantially below the detrimental amount of delta ferrite that was in the strip prior to cold rolling and (b) the amount of dendritic structure in the strip is reduced to below the detrimental amount of dendritic structure that was in the strip prior to cold rolling. By employing the method of the present invention, an austenitic stainless steel strip having a high quality surface is produced. After cold rolling and annealing, the microstructure of the strip may comprise austenitic and less than about 10% delta ferrite by volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.