On the Nitrogen-bearing 13Cr-Stainless Steels

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  • 窒素を含む13%Cr不銹鋼について
  • チッソ オ フクム 13 Cr フシュウコウ ニ ツイテ

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Abstract

The effect of nitrogen-addition on the properties of 13Cr-stainless steels was investigated by microscopic, dilatometric, hardness, tensile and corrosion tests. The results obtained were as follows: (1) Maximum amount of nitrogen addition which insures the soundness of small cast ingots was about 0.14% and 0.18% at a carbon level of 0.03% and 0.14%, respectively. (2) With increasing content of nitrogen, both the temperature of transformation during heating and the Ms temperature were lowered. (3) When air-cooled from austenitizing temperatures of 880∼1050°C, only a martensitic γ→α transformation was found to occur at temperatures below 350°C in all the steels used except for steel No. 1 containing the lowest carbon and the lowest nitrogen, in which diffusion transformation at high temperatures as well as martensitic transformation at low temperatures were observed. (4) The incubation period of the steels during the isothermal holding at 700°C became longer with increase of nitrogen content of the steels causing increased hardenability. (5) The hardness of air-cooled steels from the austenitizing temperatures was raised by tempering at above 560°C due to the decomposition of retained austenite, the amount of which increased by addition of nitrogen. (6) The tensile strength of 13Cr-stainless steel was slightly increased by nitrogen addition, but the effect was considerably smaller than that following carbon addition. (7) The corrosion resistance of the steels against boiling 1%HCl and 5%H2SO4 solutions was appreciably deteriorated by nitrogen addition as well as by carbon addition.

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