Conclusions
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1.
High-temperature thermomechanical treatment of spring steels 60S2 and 60S2F in strips 15 m long rolled by the usual procedure increases the ultimate tensile strength by comparison with the properties resulting from quenching (tempering 1 h at 400°C in both cases). Sharp cooling during TMT does not lead to excessive warping.
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2.
The developed intermediate tempering treatment retains the strength of steel 60S2F resulting from HTTMT during further heat treatment even when the steel is heated in the furnace for repeated quenching.
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3.
After TMT, double intermediate tempering followed by the usual heat treatment produces the following properties of steel 60S2F: σb=220 kg/mm2, σ0.2=200 kg/mm2, ψ=43%, δ=6%.
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Literature cited
M. L. Bernshtein and A. G. Rakhshtadt, Stal', No. 1 (1962).
M. L. Bernshtein and V. D. Kal'ner, in: Thermomechanical and Thermomagnetic Treatments [in Russian], GOSINTI (1963).
V. V. Andreeva, M. L. Bernshtein, et al., Stal', No. 3 (1967).
D. A. Prokoshkin, A. G. Rakhshtadt, and A. V. Supov, Stal', No. 3 (1967).
Additional information
Moscow Institute of Steel and Alloys, Chusovskoi Metallurgical Plant. Translated from Metallovdenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 56–59, July, 1968.
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Bernshtein, M.L., Gustomesov, A.V., Kanev, V.P. et al. Commercial tests of thermomechanical strengthening of spring steel. Met Sci Heat Treat 10, 552–554 (1968). https://doi.org/10.1007/BF00654367
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DOI: https://doi.org/10.1007/BF00654367