Conclusions
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1.
Corrosion tests, impact tests at negative temperatures, and tests of sticking showed that 40KhR steel is as good as 40KhN steel.
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2.
The qualities of locks of chromium-boron steel are the same as those of chromium-nickel locks under actual working conditions.
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3.
We recommend the use of chromium-boron steel instead of chromium-nickel steel for manufacturing ZSh-178 locks for drilling pipes.
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Azerbaijan Scientific Research Institute of Oil Drilling Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 43–44, June, 1964.
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Shneiderov, M.R., Shlimak, Y.B. & Kasimov, I.F. Use of chromium-boron steels for machine parts in oil drilling equipment. Met Sci Heat Treat 6, 375–377 (1964). https://doi.org/10.1007/BF00775333
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DOI: https://doi.org/10.1007/BF00775333