Strip of hot rolled steel of very high strength, usable for shaping and particularly for stamping
US6797078B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Sep 9, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/38
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for the production of a hot rolled metal strip of very high strength, usable for shaping and particularly for stamping, characterized in that a steel of the following weight composition: carbon, 0.12-0.25%; manganese, 1-2%; aluminum, 0.03-2.5%; silicon, 0.03-2%; chromium, 0.04-2%; phosphorus, 0.02-0.09%; sulfur optionally up to 0.01%; titanium up to 0.15%; niobium up to 0.15%; vanadium up to 0.15%; is subjected to:rolling at a temperature below 880° C.;a first short cooling, carried out over a time less than 10 seconds,a second controlled cooling with a cooling speed V ref1 comprised between 20° C./sec. and 150° C./sec., the temperature at the end of the second cooling being comprised between 700° C. and 750° C.,holding at a temperature level,a third cooling, also controlled, whose speed is comprised between 20° C./sec. and 150° C./sec., the temperature at the end of the third cooling being comprised between 350° C. and 550° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.