Conclusions
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1.
For samples treated in dry dissociated ammonia, as compared with samples treated in gas with a given moisture content, the nitrided case was deeper and the concentration of nitrogen in the case higher.
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2.
Samples treated in dry dissociated ammonia are carburized to a depth of 0.085 mm; samples treated under controlled saturation conditions are not carburized.
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3.
After treatment in dry dissociated ammonia the samples failed intercrystalline corrosion tests (GOST 6032-58)-the depth of attack in grain boundaries was 0.030 mm, with substantial etching of the grains over the entire surface of the microsection. The attack covered the entire carburized zone.
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4.
Samples treated under controlled saturation conditions were not subject to intercrystalline corrosion.
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Literature cited
E. Houdremont, Special Steels [Russian translation], Vol. 2, Metallurgiya, Moscow (1960).
R. Boyer and R. Perrine, Metallurgia, ul73, No. 436 (1966).
R. Smith, J. Amer. Chem. Soc., ul68, No. 7 (1946).
T. Kohlmeyer, Tekn. Tids. Kr., ul98, No. 19 (1968).
Additional information
Tsentroenergochermet i Pervoural'skii Starotrubnyi Zavod. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 18–21, December, 1971.
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Éstrin, B.M., Pletnev, V.I., Sokolinskii, F.D. et al. Bright quenching of welded pipe of steel Kh18N10T. Met Sci Heat Treat 13, 1012–1015 (1971). https://doi.org/10.1007/BF00664995
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DOI: https://doi.org/10.1007/BF00664995