Conclusions
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1.
After normalization steels 15GB and 15GAF have similar mechanical properties (σu, σy, δ, ψ,a ℓ) but different resistance to developing rupture, which is much greater in steel 15GB than in steel 15GAF.
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2.
The effect of temper hardening on the properties of the steels is not the same. Temper hardening of steel 15GB leads to a slight increase of strength properties and a great increase of resistance to developing rupture. Conversely, temper hardening of steel 15GAF increases the strength properties considerably but has no effect on toughness and resistance to developing rupture.
Therefore when some steel has to satisfy stringent requirements concerning the characteristics of toughness with moderate increase of strength, preference should be given to steel 15GB. When the tough properties are less important and high strength has to be obtained, steel 15GAF ahould be used.
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Literature cited
L. I. Gladshtein and D. A. Litvinenko, High-Strength Structural Steel [in Russian], Metallurgiya (1972).
Yu. I. Matrosov, "Structure and properties of low alloy steels after controlled rolling," Metalloved. Term. Obrab. Met., No. 12, 2–11 (1975).
S. S. Kanfor, Hull Steel [in Russian], Sudpromgiz, Leningrad (1960).
F. U. Boulger, Rupture [in Russian], Vol. 6, Metallurgiya, Moscow (1976).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 37–40, December, 1988.
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Kochin, F.I., Pilyushenko, V.L. Comparative investigation of steels 15GB and 15GAF after normalization and temper hardening. Met Sci Heat Treat 30, 918–922 (1988). https://doi.org/10.1007/BF00775315
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DOI: https://doi.org/10.1007/BF00775315