On the Alloying Limit of Nitrogen in High Cr-Fe Alloys and in 20%Cr Steels, and Some Related Notes

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  • 高Cr-Fe合金および20%Cr鋼における窒素の合金化限度とこれに関連する二三の知見
  • コウCr-Fe ゴウキン オヨビ 20 Cr コウ ニ オケル チッソ ノ ゴウキンカ ゲンド ト コレ ニ カンレン スル ニサン ノ チケン

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Abstract

The alloying limit of nitrogen in both high Cr-Fe alloys and 20%Cr steels has been determined in the case of air melting, and the result has been discussed. Solidification behaviors of some melts and the effect of nitrogen addition on the properties of the sound ingots containing 20%Cr have also been investigated. The results obtained are as follows: (1) The experimental formula [Cr]=32.9log[N]+42.5 holds good on the alloying limit of nitrogen in Fe-Cr-N alloys in the range from 10%Cr to 40%Cr. (2) The maximum amount of nitrogen-addition which insures the soundness of small cast ingots containing 20%Cr is 0.28%N at 0.6%C, 0.23%N at 8%Mn, and 0.48%N at 0.6%C plus 8%Mn, respectively. The alloying limit of nitrogen increases considerably with increasing carbon content of 20%Cr-8%Mn alloys. While, it is decreased slightly with increasing nickel-addition. (3) The nitrogen content at the alloying limit does not always mean the simple solid solubility of nitrogen; besides iron-solid-solutions, nitride also appears in high Cr alloys. (4) With increasing nitrogen content, the primary crystallization temperatures of molten alloys containing 20%Cr are lowered, and the fluidity of is improved. (5) The hardness of the alloys increases with increasing nitrogen. While, the intensity of magnetization is decreased due to the tendency to form austenite in the solidified alloys by the nitrogen addition.

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