Continuous annealing and pickling method and apparatus for steel strips
US4713154A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1986 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | Aug 5, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D9/561
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In a method of continuously annealing and pickling steel strips successively transferred through a continuous annealing apparatus including heating and cooling zones and a pickling apparatus, annealing the steel strips is effected in reducing atmosphere and thereafter pickling is effected at least by nitric acid electrolytic treatment. In an apparatus for continuously annealing and pickling steel strips, including a continuous annealing furnace and a pickling apparatus, the continuous annealing furnace consists of vertical furnaces capable of advancing a steel strip in a manner substantially repeating upward and downward movements alternately in substantially vertical directions and the pickling apparatus comprises at least a nitric acid electrolytic cell. In another aspect, continuous annealing furnace consists of one pass furnace capable of advancing the steel strip only once and forming a high temperature heating zone and a high temperature cooling zone of the annealing furnace, and vertical furnaces respectively forming a lower temperature heating zone and a low temperature cooling zone and capable of advancing a steel strip in a manner substantially repeating upward and downwa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.