(57) The invention relates to a method of controlling the temperature of a steel strip
(1) in the cooling zone of a continuous annealing furnace which is provided with a
plurality-of cooling rolls (2 to 5) in which a coolant is circulated via a circuit
(14 to 18) for cooling the strip as it is brought into contact with the outer peripheral
surfaces of the rolls, the coolant temperature being controlled via temperature control
means (19 to 21), and a plurality of gas jet coolers (6 to 9) for blowing cooling
gas against the strip.
In accordance with the invention, the flow rate of the cooling gas, the angle at which
the strip is brought into contact with the surfaces of the rolls and the coolant temperature
are controlled selectively in the order of, first, at least one of either the flow
rate of coolant, or the angle, and then the coolant temperature, so that the strip
may be cooled quickly and efficiently to a predetermined temperature irrespective
of any change in strip gauge during the continuous annealing of a plurality of strips
which are different gauge.
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