Conclusions
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1.
It is recommended, for improved machinability of low-carbon Cr−Mo steels, to subject them, prior to machining, to TCT (n=2–3) with heating above Ac1, holding, and air cooling.
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2.
High annealing during the final operation has little effect on machinability, and its schedule must be selected in such a way as to provide the required combination of mechanical properties to ensure good service life from the metal molds.
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Literature cited
I. E. Brainin, F. I. Shkuratov, and V. Yu. Slyusarev, "Mechanical properties and service life of metallic molds of steel 20Kh3M," Metalloved. Term. Obrab. Met., No. 5, 66–67 (1975).
V. Yu. Slyusarev, I. V. Leirikh, V. D. Maisak, and Z. P. Lyulinskii, "Preliminary thermocyclic treatment of metallic molds," Tekhnol. Organizatsiya Proizvod., No. 3, 43–44 (1984).
Additional information
Donets Polytechnical Institute. Makeevka Pipe-Casting Industries. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 62–63, July, 1986.
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Slyusarev, V.Y., Leirikh, I.V., Kochergin, V.G. et al. Effect of heat treatment on machining characteristics of low-carbon Cr−Mo steels. Met Sci Heat Treat 28, 532–533 (1986). https://doi.org/10.1007/BF00780651
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DOI: https://doi.org/10.1007/BF00780651