KANTHAL APMTTM TUBES CASE STORY The use of Kanthal APMTTM and Kanthal APMTM for radiant tubes in SSAB’s annealing furnace has pro-longed tube life and allowed for fewer furnace shutdowns, as well as the possibility to increase throughput by increasing tube temperature. THE CHALLENGE SSAB is a world-leading producer of high-strength and quenched steels. In Borlänge, Sweden, the company operates a continuous annealing line with a nitrogen- hydrogen atmosphere. The furnace is equipped with more than 200 W-shaped gas fired radiant tubes, each providing an output of 180 kW (615,000 BTU/h) giving 35 kW/m 2 (11,100 BTU/h/ft 2 ), sufficient to maintain a maximum strip temperature of 880oC (1600oF). The maximum radiant tube temperature is 1050oC (1920oF). In the most demanding zon

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