Quality heat treatment—bright hardening of type 30KhGSA steel parts—in controllable atmospheres can be carried out in box furnaces operating in cyclic regime when they are equipped with units that automatically regulate the composition of gases. The effect of gas desorption from the furnace lining can be offset by feeding endo gas with a dew point lower than that technically required into the furnace, and the composition of the protective furnace atmosphere controlled by varying the amount of air admitted to the furnace. The formation of a condensate in the sampling system, which is caused by variation in the composition of the atmosphere during charging and discharging of parts, can be eliminated by discontinuing the sampling feed into the measuring instrument of the atuomatic control unit during the disturbance. A series-produced Inei-1 apparatus equipped with a complementary unit that prevents condensate from forming in the gas-sampling system, can be used for automatic maintenance of the composition of the furnace atmosphere.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
V. É. Romanovskii et al., "Instruments for measuring the moisture content of gases by their dew points", Zavod. Lab., No. 1, 35 (1982).
V. É. Romanovskii and B. V. Radzievskii, "Instrument for monitoring the carbon potential of production gases by their moisture content", Ékspress-informatsiya: Metody i Tekh. Kontrolya i Izmeren. Mashinostr., Ser. 10.16, No. 6 (1977).
N. P. Petrov et al., "Heat treatment of steels 30KhGSA, 38KhA, and 40KhNVA in an endothermic atmosphere", Vestn. Mashinostr., No. 10, 61–62 (1963).
A. I. Kalugin, "Method of accelerated reduction of the composition of the protective atmosphere in electric furnaces", Metalloved. Term. Obrab. Met., No. 10, 52–53 (1981).
A. G. Leibush (ed.), Manufacture of Production Gas for the Synthesis of Ammonium and Methanol from Carbon Gases [in Russian], Khimiya, Moscow (1971), p. 43.
Nongovernmental Organization "All-Union Scientific-Research and Experimental Design Institute for Trade Machine Construction". Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 19–21, April, 1984.
About this article
Cite this article
Nepogodin, V.I., Lobachev, I.A. & Bakanov, A.K. Special features of regulation of the composition of the gaseous atmosphere in box heat-treatment furnaces during their cyclic operation. Met Sci Heat Treat 26, 275–277 (1984). https://doi.org/10.1007/BF00699334
- Sampling Feed
- Steel Part
- Furnace Atmosphere
- Cyclic Operation