Method and apparatus for continuous thermal treatment of a steel strip
US11193181B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 2018 |
| Grant date | Dec 7, 2021 |
| Priority date | — |
| Expiry date | Apr 24, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G3/028
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a continuous thermal treatment line for a steel strip. The strip passes through consecutive thermal treatment chambers, is quickly cooled in at least one of the chambers by spraying liquid onto the strip, or by spraying a fluid made up of gas and liquid or spraying a combination of gas and liquid forming a mist. After quick cooling, a protective metal layer is deposited on the strip by dip coating. The cooling fluid strips iron oxides or other alloy elements contained in the steel to be treated, minimizing oxidation and reducing the oxides on the strip. Spray pressure and distance are chosen to facilitate the stripping property and the mechanical action of the sprayed fluid, reducing the layer of oxides on the strip. The temperature of the strip at the end of the cooling step is the temperature necessary for carrying out the desired treatment cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.