Process and apparatus for the continuous heat treatment of a metal strip travelling in a different atmosphere
US5798007A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1997 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Mar 11, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D9/573
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for the continuous heat treatment of a metal strip, the latter travelling through a furnace, which is thermally insulated, and in a protective atmosphere; the said furnace consisting of at least one section, for heating, for temperature hold and for cooling; the said strip being guide by a plurality of rollers arranged especially in the lower part and in the upper part of the said sections, so as to form a plurality of runs, wherein the strip passes through at least one partial or total isolating device positioned within at least one section or between two sections, so as to ensure different heat transfer properties on the strip compared with at least one other adjacent section having a different atmosphere, by adjusting the composition of the atmosphere consisting of a gas mixture whose hydrogen or helium content exceeds 5% and more particularly 15%, in order to allow differentiation of the thermomechanical properties of the atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.