| 摘要 |
PURPOSE:To heat and cool steel sheet coils over the entire part thereof, uniformly, evenly and quickly by placing longitudinally the coils in a batch type heat treatment furnace for the steel sheet coils and disposing radiant tubes to face both end faces of the coils. CONSTITUTION:The batch type annealing furnace body 11 for the steel sheet coils is made of a hermetic tape and the plural coils 13 are longitudinally placed on coil stages 14 on a furnace bottom 11b. The U-shaped radiant tubes 20 are disposed in the positions facing both end faces of the coils 13. The furnace 10 is hermetically closed and after a reducing gaseous atmosphere is maintained in the furnace, the tubes 20 are heated by burners 21 and a circulation fan 15 is driven to blow the in-furnace gas heated by the tubes 20 to both end faces and peripheral faces of the coils, by which the coils 13 are heated and annealed uniformly over the entire part. Air is supplied to the tubes 20 upon ending of the annealing and at the same time a cooler 17 is driven to cool the coils 13 down to an ordinary temp. The cooled coils are taken out of the annealing furnace 10.
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