Conclusions
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1.
Nitrogen protective atmospheres free of water and carbon dioxide are not explosive and are very convenient in industry. Automatic regulation of the carbon potential with infrared analyzers or with direct control apparatus can be used in heating steel to the quenching temperature, case hardening and nitrocementation (by adding ammonia), annealing, high temperature tempering, restoring the carbon concentration in the decarburized layer, etc.
Purified nitrogen atmospheres are better than endothermic atmospheres for heat treatment.
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2.
The most economic method of producing nitrogen atmospheres is catalytic purification of nitrogen produced as a byproduct in oxygen plants.
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3.
Centralized production of the nonexplosive and cheap nitrogen protective atmospheres will accelerate the use of protective atmospheres.
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Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 12–15, December, 1964
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Sheindlin, B.E. Optimum protective atmosphere for heat treatment. Met Sci Heat Treat 6, 725–727 (1965). https://doi.org/10.1007/BF00660228
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DOI: https://doi.org/10.1007/BF00660228