Method for cooling a steel strip in a continuous annealing furna

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials

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148156, C21D 1100

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047240148

ABSTRACT:
The present invention relates to a method for cooling a steel strip in a continuous-annealing furnace. Conventionally, the steel strip is cooled by a water medium and, thus, oxidation is inevitable. Recently developed roll cooling methods can prevent oxidation but are disadvantageous in that the steel strip is non-uniformly cooled as seen in its short width direction.
The present invention attains uniform cooling by means of feedback control, in which the blowing width of the gas-jet cooler (21) is controlled by detecting the sheet temperature distribution with a thermometer (24, 60).

REFERENCES:
patent: 4415382 (1983-11-01), Gasicey et al.
patent: 4422623 (1983-12-01), Kuroda et al.

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