鑄鐵に於ける片状黒鉛の發生に就て

概要

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The author investigated the difference between the properties of charcoal pig irons and coke pig irons, and found that the superiority of charcoal pig irons is to be chiefly attributed to the less content of nitrogen. The author intended to know more exactly the effect of nitrogen on the graphitization, measured the eutectic change of cast irons which melted in various conditions, and obtained the following results ; 1) in the cast irons, whose nitrogen content is below 0.0015%, the eutectic always appears at constant temperature and obtained very fine uniformly distributed graphite. 2) in the cast irons, whose the nitrogen content is above 0.0020%, the eutectic does not appear at constant temperature and obtained flaky graphite colonies surrounded by the fine graphite and free cementite. 3) to obtain the eutectic graphite or pearlite cast iron, it is necessary to cast the materials whose nitrogen content is very small and the eutectic change appears at constant temperature.
社団法人日本鉄鋼協会の論文
1937-02-25