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Rapid carburizing with natural gas in a fluidized bed

Conclusions

  1. 1.

    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.

  2. 2.

    In order to increase the carbon potential of the atmosphere with α=0.26–0.29, 15–25% gas-carburizer must be added.

  3. 3.

    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.

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Literature cited

  1. 1.

    A. P. Baskakov, Rapid Oxidation-Free Heating and Heat Treatment in a Fluidized Bed [in Russian], Metallurgiya, Moscow (1968).

  2. 2.

    V. A. Vinokurov et al., in: Experimental Designs of Turbines and Diesels [in Russian], Sverdlovsk (1969).

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    S. S. Iskhakov et al.; Metal. i Term. Obrabotka Metal., No. 11 (1969).

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    Yu. M. Kaletin and L. V. Kudryavtseva, Heat Treatment of Heavily Loaded Toothed Wheels [in Russian], Mashinostroenie, Moscow (1966).

  5. 5.

    A. P. Gulyaev, Heat Treatment of Steel [in Russian], Mashgiz, Moscow (1960).

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    M. A. Krishtal, Diffusion Processes in Iron Alloys [in Russian], Metallurgizdat, Moscow (1963).

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    S. D. Gertsriken and I. Ya. Dekhtyar, Diffusion in Metals and Alloys in the Solid Phase [in Russian], Fizmatgiz, Moscow (1960).

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    I. N. Kidin and V. I. Andryushechkin, Metal. i Term. Obrabotka Metal., No. 3 (1964).

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    I. N. Kidin, Izv. Vuzov. Chernaya Metallurgiya, No. 3 (1964).

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Additional information

Urals Polytechnical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 25–30, June, 1972.

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Pumpyanskaya, T.A., Vinokurov, V.A. & Baskakov, A.P. Rapid carburizing with natural gas in a fluidized bed. Met Sci Heat Treat 14, 493–497 (1972). https://doi.org/10.1007/BF00648301

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Keywords

  • Atmosphere
  • Combustion
  • Favorable Condition
  • Alloy Steel
  • Rapid Heating