Conclusions
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1.
Crucibles should be made of 18/8 and 25/20 nickel steels with additions of titanium and molybdenum.
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2.
Crucibles must be welded with suitable electrodes to produce weld seams with a chemical composition as close as possible to that of the base metal.
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3.
The cathodic protection of the crucible was selected with a protective current of 0.7 A/dm2. During warming or cooling of the bath the protective current is turned on or off at bath temperatures no higher than 700°C. The protection is continuous.
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4.
The adoption of these recommendations will increase the reliability and ensure working lives up to 4000 h.
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Literature cited
S. L. Rustem, Collection of Reports of the All-Union Scientific-Technical Conference in Leningrad on “Progressive methods of heat treating machine parts and tools” [in Russian], Moscow (1966).
A. N. Minkevich, Metal. i Term. Obrabotka Metal., No. 3 (1964).
A. N. Minkevich, Chemicothermal Treatments of Metals and Alloys [in Russian], Metallurgiya, Moscow (1965).
F. F. Khimushin, Stainless Steels [in Russian], Metallurgiya Moscow (1967).
Additional information
Comintern Sinel'nikovskii Plant. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 36–37, July, 1968.
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Shalya, M.A., Bordyug, G.N. Wear of electrolytic boronizing crucibles. Met Sci Heat Treat 10, 531–532 (1968). https://doi.org/10.1007/BF00654359
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DOI: https://doi.org/10.1007/BF00654359