Hood-type annealing furnace and method for operating the same
US9297585B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 2013 |
| Grant date | Mar 29, 2016 |
| Priority date | — |
| Expiry date | Jun 10, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D99/0033
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A hood-type annealing furnace for the thermal treatment of cold-rolled steel strip includes a base, a protective hood which can be placed on the latter and under which a protective gas heated by a gas burner is circulated by a blower, to heat the steel strip, rolled up particularly into a coil, under the protective hood to a temperature of at least 500° C. in a protective gas atmosphere. An electric heater fed by the public power network has a heating capacity correspondingly substantially to the heating capacity of the gas burner. The protective gas can be independently heated with the electric heater, alternatively to the gas burner, with the gas burner switched off, to a temperature above the recrystallization annealing temperature. A method for operating a hood-type annealing furnace is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.