Process for producing a strip of hot rolled steel sheet having a very high yield point and the steel sheet obtained
US5716464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Jun 13, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for producing a strip of hot rolled steel sheet having a very high yield point of use in particular for the forming of parts and having a brittle/ductile transition at a temperature below -50.degree. C., characterized in that the steel having the following composition by weight; PA1 carbon.ltoreq.0.1%, PA1 1%.ltoreq.manganese.ltoreq.1.5%, PA1 silicon.ltoreq.0.3%, PA1 phosphorus.ltoreq.0.03%, PA1 sulphur.ltoreq.0.01%, PA1 0.01%.ltoreq.aluminium.ltoreq.0.1%, PA1 0.04%.ltoreq.niobium.ltoreq.0.06%, PA1 0.1%.ltoreq.titanium.ltoreq.0.15%, PA1 0.1%.ltoreq.molybdenum.ltoreq.0.2%, is subjected, after hot rolling, to a controlled cooling at a cooling rate of between 20.degree. C. per second and 100.degree. C. per second down to a temperature of between 550.degree. C. and 750.degree. C. of the end of the cooling. The invention also relates to the sheet obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.