| 摘要 |
PURPOSE:To prevent generation of a fault such as oscillation, transverse chamber, etc. of a steel strip and to prevent the surface of the steel strip from being grazed by disposing plural pairs of guide rolls between upper and lower hearth rolls in a quick cooling zone of a continuous annealing device for the steel strip. CONSTITUTION:A cold atmosphere gas having a reducing property is ejected to the surface of a steel strip to cool said strip in a quick cooling zone 6 of a continuous annealing device for the steel strip. The steel strip is oscillated and transversely cambered by the cold atmosphere gas ejected thereto and contacts nozzles for ejecting said gas, by which the surface is grazed when said strip is cooled in the zone 6 while the strip passes between upper hearth rolls 7, 7' and lower hearth rolls 8, 8'. The merchandise value of the steel strip is thus lost. Plural sets of guide rolls 10, 10', 10'', etc. are disposed between the upper and lower hearth rolls to prevent such trouble and the steel strip is passed between said rolls, by which the generation of the defect occurring in the oscillation, transverse camber, etc. of the steel strip is prevented. |
