Abstract: A strip cooling apparatus for a continuous annealing furnace for continuously treating longitudinally fed steel strip has a pair of cooling gas chambers attached to the furnace walls on both sides of the strip so that the front of each chamber faces the strip. Each cooling gas chamber has nozzles having round outlets opening toward the strip surface on its front side to shoot forth a cooling gas jet against the strip furnace. The nozzle is separated from the strip by a distance z not larger than 70 mm and projected from the front of the cooling gas chamber by a length of not less than (100--z) z) mm. The cooling apparatus also has a pair of rotatably holding rolls reciprocatably attached to the furnace walls to press the strip at a right angle thereto. The holding rolls holds the strip and prevents the occurrence of fluttering.

Abstract: A method and an apparatus for measuring a heated material in an industrial furnace by the use of a radiation thermometer comprising providing a sliding means at the tip portion of the radiation thermometer, changing a distance between the heated material and the shielding means to determine background radiation rate of the energy reflected or emitted from the atmosphere of the furnace. The background radiation rate is determined by the output energy of the radiation thermometer, which together with an accurate temperature of the heated material and an ambient temperature of the furnace, are used to calculate a temperature error at arbitrary distances. Setting the shielding means of the radiation thermometer in a position at which the temperature error is within a tolerable range, and measuring the heated material with use of the radiation thermometer.