Conclusions
-
1.
When alloyed with ∼0.003% B, steel 40GR with a section as large as 40 mm has a higher fracture toughness and lower cold brittleness threshold than steel 40G after quenching and tempering to a hardness of HB 290.
-
2.
After quenching and low-temperature tempering, medium-carbon steel with boron may have a fairly high fracture toughness along with high hardness.
-
3.
To eliminate the high susceptibility of the steel to brittle fracture the boron content should be ∼0.001–0.004%.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Literature cited
Ya. E. Gol'dshtein et al., Metal. i Term. Obrabotka Metal., No. 4 (1969).
G. Krainer and M. Kroneis, Problemy Sovremennoi Metallurgii, No. 6 (1953).
R. Wilcock, J. Iron Steel Inst., No. 6 (1953).
L. L. Pyatakova et al., Traktory i Sel'khozmashiny, No. 7 (1966).
A. P. Gulyaev, Metal. i Term. Obrabotka Metal., No. 10 (1967).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 62–64, February, 1971.
Rights and permissions
About this article
Cite this article
Pyatakova, L.L., Mozharov, M.V., Sirotkina, M.A. et al. Effect of boron on the cold brittleness of medium-carbon steel. Met Sci Heat Treat 13, 152–154 (1971). https://doi.org/10.1007/BF00650937
Issue Date:
DOI: https://doi.org/10.1007/BF00650937