Abstract
Study results of the effect of high-temperature vacuum chemical-thermal treatment on the grain size of structural steels possessing various chemical compositions are given. It is determined that a sufficiently large grain is formed in the 20KhN3A, 25KhGT, and 20KhNR steels during quenching directly after prequench from the carbonization temperature of 1000–1050 to 850°C, whose size exceeds acceptable limits. It is stated that the steels manufactured according to GOST 4543–2016 are inapplicable for high-temperature carbonization. The composition of new inheritable fine-grained steel is developed, which is not affected by the increase in the carbonization temperature. An increase in the carbonization temperature of new steel up to 1050°C with a double decrease in the time of treatment is demonstrated.
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Translated by A. Muravev
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Rudenko, S.P., Val’ko, A.L. & Chichin, A.N. Steel for High-Temperature Carbonization. Steel Transl. 50, 128–133 (2020). https://doi.org/10.3103/S0967091220020072
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DOI: https://doi.org/10.3103/S0967091220020072