Conclusions
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1.
Titanium-free steel of the Kh21N5 and Kh21N6M2 types containing 0.04–0.09% C and quenched from 950°C show a prolonged resistance to intercrystalline corrosion when subjected to “dangerous” temperatures. All the other steels investigated, even when they are resistant to intercrystalline corrosion after additional heating at 450–850°C, lose this resistance after a short time at 1250°C.
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2.
The resistance to intercrystalline corrosion in weakly oxidizing media decreases with increasing amounts of ferrite in ferritic-austenitic steels.
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3.
Titanium favors an increase in the amount of ferrite in the steel but slows down the diffusion of carbon and forms carbides during tempering, which reduces the susceptibility of the steel to intercrystalline corrosion. Therefore, the effect of titanium is favorable only if the amount of titanium is adequate.
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Literature Cited
Kolomb'e and I. Gokhman, Stainless Steels [in Russian], Moscow, Metallurgizdat (1958).
V. S. Mes'kin, Fundamentals of Alloying of Steel [in Russian], Mashgiz (1960).
M. Vyklitski and K. Lebel', Symposium on Stainless Steels, Prague [in Russian] (1961).
Additional information
State Institute of Oil Machine Construction Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 22–25, October, 1964
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Levin, I.A., Kochergina, D.G. Effect of titanium on the resistance of ferritic-austenitic steels to intercrystalline corrosion. Met Sci Heat Treat 6, 602–605 (1964). https://doi.org/10.1007/BF00648698
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DOI: https://doi.org/10.1007/BF00648698