Effect of Nitrogen and Other Alloying Elements on the Low-Temperature Brittleness of Steel. II : Correlative Effect of Nitrogen and Phosphorus

概要

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A study was made of the relation of the co-operation of phosphorus and nitrogen to the low-temperature brittleness of steel, and the following results were obtained. 1. The effect of nitrogen was observed in the steel containing phosphorus in raising the transition temperature, being stronger than in the steel without phosphorus. 2. The range of nitrogen content which abruptly raises the transition temperature was in low-nitrogen side, compared with the steel without phosphorus. 3. Phosphorus was an element that makes the low-temperature brittleness greater. It was made clear that the effect of nitrogen was reduced when the nitrogen in the steel was fixed as AlN by adding aluminium to molten steel, and that the degree of reduction of the effect was conspicuous as in low-carbon steel. It was also clarified that when carbon content became larger, the transition temperature rose even if nitrogen was fixed by aluminium, compared with the specimen with 0.003% of nitrogen, because of the effect of aluminium and other phenomena which raise the transition temperature, and that the transition temperature became lower when nitrogen was fixed in the specimens containing phosphorus by adding aluminium, as the effect of nitrogen was great in such specimens.
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