Stepped quenching, used in mass production of thread-cutting dies, is not the best heat treatment due to substantial distortion.
The quality of thread-cutting dies made of steel 9KhS is improved by isothermal quenching — there is less distortion and the durability increases.
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Yu. A. Geller, in: Modern Methods of Heat Treating Steels [in Russian], Mashgiz, Moscow (1954).
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, p. 47, September, 1970.
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Savinovskii, G.K. Heat treatment of thread-cutting dies. Met Sci Heat Treat 12, 766–767 (1970). https://doi.org/10.1007/BF00652730
- Heat Treatment
- Mass Production
- Good Heat
- Durability Increase
- Substantial Distortion