EP 0067098 B1 19851030 - METHOD OF IONITRIDING A STEEL ARTICLE WHICH HAS BEEN PLASTICALLY DEFORMED IN ADVANCE
Title (en)
METHOD OF IONITRIDING A STEEL ARTICLE WHICH HAS BEEN PLASTICALLY DEFORMED IN ADVANCE
Publication
Application
Priority
FR 8110129 A 19810521
Abstract (en)
[origin: EP0067098A1] 1. A method for the ionic nitriding of pieces of steel of any type, which comprises the following four stages in succession : a) a prior cold-working operation on the piece, the final degree of cold-working of which is between 10% and 40% ; b) a first ionic nitriding sequence with a duration of between one hour and 10 hours, carried out at a temperature t1 of between 450 degrees and 520 degrees, in a gaseous mixture consisting of nitrogen and hydrogen, which is such that the nitrogen partial pressure p1 is between 10 and 35 Pascal and such that the total gas pressure is between 200 and 650 Pascal ; c) a second ionic nitriding sequence the duration of which is between 40 and 70 hours, carried out at a temperature t2 of between 500 degrees and 580 degrees C and at least 10 degrees C and at most 50 degrees C above t1 in a gaseous mixture consisting of nitrogen and hydrogen, which is such that the nitrogen partial pressure p2 is between 60 and 80 Pascal, and that the total gas pressure remains between 200 and 650 Pascal ; and d) a final cooling in vacuo.
IPC 1-7
IPC 8 full level
C23C 8/02 (2006.01); C23C 8/38 (2006.01); C23C 16/36 (2006.01)
CPC (source: EP)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0067098 A1 19821215; EP 0067098 B1 19851030; AT E16293 T1 19851115; DE 3267120 D1 19851205; DK 157691 B 19900205; DK 157691 C 19900702; DK 228982 A 19821122; ES 512331 A0 19830301; ES 8304613 A1 19830301; FR 2506339 A1 19821126; FR 2506339 B1 19831223; GR 75839 B 19840802; PT 74775 A 19820501; PT 74775 B 19831108; ZA 823472 B 19830330
DOCDB simple family (application)
EP 82400928 A 19820519; AT 82400928 T 19820519; DE 3267120 T 19820519; DK 228982 A 19820519; ES 512331 A 19820519; FR 8110129 A 19810521; GR 820167962 A 19820422; PT 7477582 A 19820421; ZA 823472 A 19820519