Conclusions
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1.
Lowering of the tempering temperature of high-strength steel 40Kh bolts to t<400°C leads to a marked reduction in their longevity in a slightly aggressive atmosphere that causes the metal to absorb hydrogen during electrochemical corrosion.
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2.
The tendency of high-strength steel 40Kh bolts tempered in the interval of irreversible temper brittleness to failure, which is elevated in a slightly aggressive medium, is caused by additional weakening of the boundaries of former austenite grains under the action of hydrogen that is absoorbed onto them.
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3.
Steel 40Kh bolts with 0.37–0.43% C are not inclined to corrosion cracking in a slightly aggressive industrial atmosphere after tempering at 470°C.
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Literature cited
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Additional information
Central Scientific-Research Institute for the Design and Planning of Steel Structures. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 4–7, April, 1992.
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Sotskov, N.I., Goritskii, V.M. & Morozova, L.M. Effect of tempering temperature on the resistance of high-strength steel 40Kh bolts to corrosion cracking. Met Sci Heat Treat 34, 228–232 (1992). https://doi.org/10.1007/BF00702539
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DOI: https://doi.org/10.1007/BF00702539