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US 2017/0356077 A1Published application
Low pressure carbonitriding method and furnace
AssigneeECM Technologies
InventorsYves GIRAUD, Hubert MULIN
Life of this patent
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AssigneeECM Technologies
InventorsYves GIRAUD, Hubert MULIN
Estimating the term…
A method for carbonitriding of a steel part arranged in a chamber comprises first steps and second steps, a carburizing gas being injected into the chamber during the first steps only and a nitriding gas being injected into the chamber during the second steps only, at least one of the second steps being situated between two first steps, the pressure in the chamber during at least one part of said two first steps being maintained at a first value and the pressure in the chamber during at least one part of said second step situated between said two first steps being at a second value that is strictly greater than the first value.
A method of carbonitriding a steel part arranged in a chamber, comprising first steps and second steps, a carburizing gas being injected into the chamber only during the first steps and a nitriding gas being injected into the chamber only during the second steps, at least one of the second steps taking place between two of the first steps, the pressure in the chamber during at least part of said two first steps being maintained at a first value and the pressure in the chamber during at least part of said second step taking place between said two first steps being at a second value greater than the first value.
A carbonitriding furnace intended to receive, in a chamber, a steel part, comprising gas introduction and gas extraction circuits, and a control unit capable of controlling the gas introduction and gas extraction circuits to introduce, during first steps and second steps, a carburizing gas into the chamber only during the first steps and a nitriding gas into the chamber only during the second steps, at least one of the second steps taking place between two first steps, and capable of maintaining the pressure in the chamber during at least part of the two first steps at a first value and the pressure in the chamber during at least part of said second step taking place between the two steps first at a second value greater than the first value.
Dependencies are inferred from the claim text.