The effect on the reaction of steel in carburizing atmosphere produced by combustion of charcoal in wet air and mingled with ammonia gas was studied under various conditions, especially, on the subject of the carbonitriding of the steel by the gas, and the following results were obtained: (1) The same degree of carbonitriding was obtained with lower gas velocity than in mere carburizing. (2) The relation of carbonitriding (in mg/cm2, weight %) and treating time was illustrated in parabolic curves. (3) The carbonitrided quantity increased with the increase of NH3 gas at lower temperatures, but decreased at higher temperatures. (4) Sooting decreased even at low temperature by addition of NH3 gas to the carburizing atmosphere.
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