EP 1122331 B1 20030326 - Process of nitriding and/or carbonitriding of high-alloyed steel
Title (en)
Process of nitriding and/or carbonitriding of high-alloyed steel
Title (de)
Verfahren zum Nitrieren und/oder Nitrocarburieren von höher legierten Stählen
Title (fr)
Procédé pour la nitruration et/ou carbonitruration d' acier fortement allié
Publication
Application
Priority
EP 00102359 A 20000204
Abstract (en)
[origin: US6328819B1] A method is provided for heat treatment of metal workpieces obtain a substantially uniform nitride layer, even in workpieces comprising high alloy iron articles. The following method steps are provided:a) heating the workpieces to a temperature between 400° C. and 500° C. in a gas atmosphere comprising only ammonia;b) continuing to heat the workpieces to a temperature between 500° C. and 700° C. in a gas atmosphere containing ammonia and an added oxidizing agent;c) maintaining the workpieces at this temperature and in this gas atmosphere for a period of between 0.1 hour and 5 hours;d) continuing to maintain the workpieces at this temperature for a period of between 1 hour and 100 hours in a gas atmosphere containing ammonia or containing ammonia and a carbon-releasing substance; and,e) cooling the workpieces to room temperature.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
Designated contracting state (EPC)
AT CH DE FR GB IT LI
DOCDB simple family (publication)
EP 1122331 A1 20010808; EP 1122331 B1 20030326; AT E235581 T1 20030415; DE 50001540 D1 20030430; US 6328819 B1 20011211
DOCDB simple family (application)
EP 00102359 A 20000204; AT 00102359 T 20000204; DE 50001540 T 20000204; US 56269500 A 20000428