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US 8,784,575 B2Granted
Low pressure carbonitriding method and device
AssigneeECM Technologies
InventorsJean Berlier, Aymeric Goldsteinas, Xavier Doussot
Life of this patent
Estimating the term…
Abstract
A method for carbonitriding a steel part arranged in an enclosure maintained at a reduced internal pressure, the part being maintained at a temperature level, comprising an alternation of first and second steps, a carburizing gas being injected into the enclosure during the first steps only and a nitriding gas being injected into the enclosure only during at least part of at least two second steps.
Claims7
A method for carbonitriding a steel part arranged in an enclosure maintained at a reduced internal pressure, the part being maintained at a temperature level, the method comprising:
- an alternation of first and second steps, in which each of the first steps is followed by one of the second steps, a carburizing gas being injected into the enclosure during the first steps only and a nitriding gas being injected into the enclosure only during at least part of at least two second steps, the nitriding gas being injected into the enclosure during at least a second step for a time shorter than the duration of said second step, the rest of the second step being carried out in the presence of a neutral gas.
Dependencies are inferred from the claim text.