Metal treatment – Compositions – Heat treating
Patent
1986-07-10
1988-09-06
Brody, Christopher W.
Metal treatment
Compositions
Heat treating
148128, C21D 174
Patent
active
047690909
ABSTRACT:
Process in which there are injected a carrier gas and a hydrocarbon capable of producing, at conventional carburizing temperatures, an atmosphere of predetermined composition having a nominal concentration of carbon monoxide, a door of the furnace being opened with a given periodicity to permit the passage of a charge to be carburized, the opening of this door resulting in particular in an increase in the concentration of the oxidizing species in the atmosphere of the furnace. According to the invention, the concentration of carbon monoxide of the atmosphere injected into the furnace is increased with the same periodicity so as to compensate for the increase in the concentration of the oxidizing species of the furnace and thus maintain the carbon potential of the carburizing atmosphere of the furnace substantially constant throughout the duration of the carburization of the workpieces of the charge.
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Brody Christopher W.
L'Air Liquide
Robinson, Jr. Lee C.
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