Tomo-o Sato and Saburô Toya
Fully and partially pre-graphitized graphitic steels belonging to the Fe-C-Si system were subjected to some experiments on heat-treatment and the following results were obtained ; In fully pre-graphitized steel containing about 1.5%C and 1.5%Si, the period for resolution of graphite into austenite up to saturation at 850° is about 20 min, and in partially pre-graphitized same steel, it is about 10 min. The quenching hardness of this steel varies with the distribution of graphite perticles, that is, with the increase of the number of graphite particles the quenching hardness decreases. The hardenability of graphitic steel of this system increases with Si content, but decreases with C content.
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