Ecm Technologies

Jerome Lardinois

Yves Giraud

Philippe Lapierre

Alfred Rallo

A method for the low-pressure carbonitriding of steel parts, in particular parts used in the manufacture of automobiles comprises a heating step that includes a simple heating phase (M) followed by an initial nitridation phase (Ni) from a temperature between 700&#xb0; C. to 750&#xb0; C. to a temperature between 860&#xb0; and 1000&#xb0; C. carried out using a reduced temperature gradient relative to the simple heating phase. The method further includes alternate cementing (C-Cn) and nitridation (N-Nn) steps at constant temperature, wherein the final nitridation step is accompanied with a decrease in temperature immediately before quenching (T).

Carbonitriding method having a final nitridation step during temperature decrease

A method for the low-pressure carbonitriding of steel parts, in particular parts used in the manufacture of automobiles comprises a heating step that includes a simple heating phase (M) followed by an initial nitridation phase (Ni) from a temperature between 700&#xb0; C. to 750&#xb0; C. to a temperature between 860&#xb0; C. and 1000&#xb0; C. and carried out using a reduced temperature gradient relative to the simple heating phase. Additionally, alternate cementing (C1-Cn) and nitridation (N1-Nn) steps are performed at constant temperature, wherein the final nitridation step is accompanied with a decrease in temperature immediately before quenching (T).

Method for low-pressure carbonitriding having an extended temperature range in an initial nitridation phase

A method for the low-pressure carbonitriding of steel parts, in particular parts used in the manufacture of automobiles, comprises a heating step that includes a simple heating phase (M) followed by an initial nitridation phase (Ni) from a temperature between 700&#xb0; C. to 750&#xb0; C. to a temperature between 860&#xb0; and 1000&#xb0; C. and carried out using a reduced temperature gradient relative to the simple heating phase. Additionally, alternate cementing (C1-Cn) and nitridation (N1-Nn) steps are performed at constant temperature, wherein the final nitridation step is accompanied with a decrease in temperature immediately before quenching (T).

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Courcelles les Montbeliard, France

Jerome Lardinois