Abstract: 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° C. to 750° C. to a temperature between 860° C. and 1000° 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).
Type:
Grant
Filed:
October 8, 2012
Date of Patent:
September 19, 2017
Assignee:
ECM Technologies
Inventors:
Philippe Lapierre, Jerome Lardinois, Yves Giraud, Alfred Rallo
Abstract: 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° C. to 750° C. to a temperature between 860° and 1000° 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).
Type:
Application
Filed:
October 8, 2012
Publication date:
August 24, 2017
Applicant:
ECM Technologies
Inventors:
Philippe Lapierre, Jerome Lardinois, Yves Giraud, Alfred Rallo
Abstract: 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° C. to 750° C. to a temperature between 860° and 1000° 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).
Type:
Grant
Filed:
October 8, 2012
Date of Patent:
July 18, 2017
Assignee:
ECM Technologies
Inventors:
Philippe Lapierre, Jerome Lardinois, Yves Giraud, Alfred Rallo
Abstract: 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° C. to 750° C. to a temperature between 860° and 1000° 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).
Type:
Application
Filed:
October 8, 2012
Publication date:
August 28, 2014
Applicant:
ECM Technologies
Inventors:
Philippe Lapierre, Jerome Lardinois, Yves Giraud, Alfred Rallo
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.
Type:
Grant
Filed:
October 22, 2012
Date of Patent:
July 22, 2014
Assignee:
ECM Technologies
Inventors:
Jean Berlier, Aymeric Goldsteinas, Xavier Doussot
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.
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.
Type:
Grant
Filed:
April 19, 2006
Date of Patent:
November 6, 2012
Assignee:
ECM Technologies
Inventors:
Jean Berlier, Aymeric Goldsteinas, Xavier Doussot