Loading patent…
AssigneeECM Technologies
InventorsPhilippe Lapierre, Jerome Lardinois, Yves Giraud, Alfred Rallo
Estimating the term…
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. carried out using a reduced temperature gradient relative to the simple heating phase. The method further includes alternate cementing (C1-Cn) and nitridation (N1-Nn) steps at constant temperature, wherein the final nitridation step is accompanied with a decrease in temperature immediately before quenching (T).
A carbonitriding steel parts method, particularly parts used to manufacture automobile vehicles, comprising alternated cementation and nitriding steps at constant temperature, preceded by a heating step and followed by a quenching step, wherein the heating step comprises a simple heating phase followed by an initial nitriding phase, apart from the alternated cementation and nitriding steps, during which the heating is carried on, and wherein the method comprises a final nitriding step accompanied by a cooling immediately before the quenching.
Dependencies are inferred from the claim text.