抄録
As described in the 1 st and 2 nd reports, when the carburizer with any suppressor is used, the promotive power decays according to the reaction between the suppresser and the promoter in the carhurizer. As the result of decaying, the carbon content in the surface layer of carhurized steel lowers with the proceeding of carburizing. It was calculated nn the stand point of Jaw of diffusion by applying the Duhamel theory in thermal conduction, how much this lowering offected the carbon distribution in carburized case, and found that the carbon distribution was not steeper and scarcely distinguished from that treated with the common mild-carburizer.
