A long series of comparative carburization tests have been performed on small samples of different heat resisting alloys at temperatures of 1050°C (1922°F) and 1150°C (2100°F). These tests have been carried out in a laboratory using solid Houghton F cement for a carburizing media and small alloy smaples machined from the wall of ethylene furnace tubes. The results of these tests permit a classification of the different alloys manufactured as centrifugally cast tubes.

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