Conclusions
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1.
Alloying of steel 30N9K4 with 0.2–1.5% Mo, 0.1% V, and 0.02% N increases the resistance to tempering, reduces the tendency to austenite grain growth, and increases the hardenability.
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2.
After quenching and high-temperature tempering at 550° the steel alloyed with molybdenum and vanadium has high strength and toughness — σb as high as 150 kg/mm2, σ0.2 as high as 140 kg/mm2, δ5 as high as 17%, ψ as high as 57%,a n=6–7.5kg-m/cm2,a n −196=4.5–5 kg-m/cm2,a p=4–4.5 kg-m/cm2. T50=−100 to −140°.
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3.
Alloying of steel 30N9K4 with molybdenum lowers its susceptibility to reversible temper brittleness by a factor of three to five.
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Additional information
I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 2–7, March, 1977.
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Gulyaev, A.P., Zikeev, V.N. & Guseinov, R.K. Effect of alloying with molybdenum, vanadium and nitrogen on the properties of steel 30N9K4. Met Sci Heat Treat 19, 169–174 (1977). https://doi.org/10.1007/BF01166992
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DOI: https://doi.org/10.1007/BF01166992