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.
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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
- Favorable Condition
- Alloy Steel
- Rapid Heating