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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047253215

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 (1) is nonuniformly cooled as seen in its short width direction.
The present invention attains uniform cooling by means of feedback-feedforward control, in which the blowing width of the gas-jet cooler (21, 53) is controlled by detecting the sheet temperature distribution with thermometers (24, 55, 60).

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

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