Rapid carburizing with natural gas in a fluidized bed
Carburizing with combustion of natural gas in a fluidized bed with a stationary catalyst and air input coefficient α<0.25 is not possible because the GIAP-3 catalyst is deactivated by soot.
When α=0.26–0.29 the carburizing capacity of the atmosphere is insufficient to carburize carbon and alloy steels.
In order to increase the carbon potential of the atmosphere with α=0.26–0.29, 15–25% gas-carburizer must be added.
The carburizing time for a case depth of 1.0–1.2 mm is 1.5 h at 950°C with the addition of raw natural gas. The high rate of the process is due to the rapid heating and more favorable conditions of the surface for carburizing in a fluidized bed.
KeywordsAtmosphere Combustion Favorable Condition Alloy Steel Rapid Heating
Unable to display preview. Download preview PDF.
- 1.A. P. Baskakov, Rapid Oxidation-Free Heating and Heat Treatment in a Fluidized Bed [in Russian], Metallurgiya, Moscow (1968).Google Scholar
- 2.V. A. Vinokurov et al., in: Experimental Designs of Turbines and Diesels [in Russian], Sverdlovsk (1969).Google Scholar
- 3.S. S. Iskhakov et al.; Metal. i Term. Obrabotka Metal., No. 11 (1969).Google Scholar
- 4.Yu. M. Kaletin and L. V. Kudryavtseva, Heat Treatment of Heavily Loaded Toothed Wheels [in Russian], Mashinostroenie, Moscow (1966).Google Scholar
- 5.A. P. Gulyaev, Heat Treatment of Steel [in Russian], Mashgiz, Moscow (1960).Google Scholar
- 6.M. A. Krishtal, Diffusion Processes in Iron Alloys [in Russian], Metallurgizdat, Moscow (1963).Google Scholar
- 7.S. D. Gertsriken and I. Ya. Dekhtyar, Diffusion in Metals and Alloys in the Solid Phase [in Russian], Fizmatgiz, Moscow (1960).Google Scholar
- 8.I. N. Kidin and V. I. Andryushechkin, Metal. i Term. Obrabotka Metal., No. 3 (1964).Google Scholar
- 9.I. N. Kidin, Izv. Vuzov. Chernaya Metallurgiya, No. 3 (1964).Google Scholar