EP 0059803 A1 19820915 - A process for case hardening steel.
Title (en)
A process for case hardening steel.
Title (de)
Verfahren zum Einsatzhärten von Stahl.
Title (fr)
Procédé pour la cémentation d'acier.
Publication
Application
Priority
EP 81300922 A 19810305
Abstract (en)
A process for case hardening steel is described. A fused bath of inert salt is provided which is comprised of alkali halides, alkali earth halides, or mixtures thereof, and alkali oxides, alkaline earth oxides, alkali carbonates, alkaline earth carbonates, or mixtures thereof. There is added to this fused bath, after suspending the steel therein, urea, dicyanodiamide, pyrolysis/condensation products of urea or dicyanodiamide, or combinations thereof. This will form active ions containing carbon and/or nitrogen, and either the nitrogen and/or carbon will diffuse into the surface of a steel piece suspended in the bath to form either a nitrided, carbonitrided or carburized case depending upon the temperature of the bath, which is selectively maintained between above 540 DEG C. and about 950 DEG C.
IPC 1-7
IPC 8 full level
C23C 8/46 (2006.01); C23C 8/50 (2006.01); C23C 8/56 (2006.01)
CPC (source: EP)
C23C 8/46 (2013.01); C23C 8/50 (2013.01); C23C 8/56 (2013.01)
Citation (search report)
- FR 744050 A 19330410
- US 1772866 A 19300812 - MARX HIRSCH
- US 3303063 A 19670207 - PIETRYKA ROBERT J
- US 2541085 A 19510213 - MORRAL FACUNDO R
- DE 800132 C 19500922 - DEGUSSA
- US 2049806 A 19360804 - HOLT DONALD A
- DE 2310250 A1 19740905 - BEHNCKE HERMANN DR
- US 2801154 A 19570730 - DE PREE DAVID O, et al
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
EP 0059803 A1 19820915; EP 0059803 B1 19860205; DE 3173690 D1 19860320
DOCDB simple family (application)
EP 81300922 A 19810305; DE 3173690 T 19810305