KANTHAL APMTM TUBES CASE STORY The majority of tubes used today in gas heated heat treatment furnaces are of the SER (single ended re- cuperative) design. The limiting factor for the lifetime in this system is normally the inner tube, which is exposed to a significantly higher temperature than the outer tube. A common material for inner tubes is nickel-chromium. In a number of gas heated furnaces, the nickel-chromium tubes have been replaced by Kanthal APMTM tubes, a material with much higher loading potential and 100°C (210°F) higher operating temperature. Another feature is that Kanthal APMTM forms no scale that contaminates the tubes and the furnace interior. THE CHALLENGE Koyo Heat Treatment in Osaka is mainly using natural gas for their batch and continuous furnaces. They

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