KANTHAL APMTM TUBES CASE STORY Gearbox del Prat, situated in Barcelona, Spain is the central manufacturing unit of gearboxes to Seat, with a daily production of some 3000 gearboxes. THE CHALLENGE The heat treatment is carried out in four continuous gas fired pusher furnaces and in a two sealed quench furnaces. Production reliability is of course critical, and the fur- naces must operate at tight production schedules where production stoppages would cause severe problems. THE SOLUTION Kanthal APMTM inner and outer tubes in the recuperative systems were installed on trial and they have out- performed the different previous systems by far. The lifetime is superior and the rating is higher. The four continuous furnaces are running at 880–930°C (1620–1710°F) with endogas atmosphere, he

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