EP 0662525 B1 19970625 - Process for preventing surface oxidation during steel carburizing
Title (en)
Process for preventing surface oxidation during steel carburizing
Title (de)
Verfahren zur Vermeidung von Randoxidation beim Aufkohlen von Stählen
Title (fr)
Procédé pour empêcher l'oxydation superficielle pendant la carburation des aciers
Publication
Application
Priority
DE 4400391 A 19940108
Abstract (en)
[origin: EP0662525A1] Preventing of surface oxidn. in the carburisation of steels under a carbon-contg. gas mixt. at carburisation temp. is novel in that the steels are heated up to the carburisation temp. under a nitrogen/hydrogen gas mixt. or with pure hydrogen and during the carburisation the nitrogen/hydrogen gas mixt. or the hydrogen is replaced by a carbon-contg. gas mixt with an oxygen activity smaller than that necessary for the formation of manganese (II) or chromium (III) oxide.
IPC 1-7
IPC 8 full level
C21D 1/76 (2006.01); C21D 3/06 (2006.01); C23C 8/22 (2006.01)
CPC (source: EP US)
C21D 3/06 (2013.01 - EP US); C23C 8/22 (2013.01 - EP US); C21D 1/76 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE DE FR GB IT
DOCDB simple family (publication)
EP 0662525 A1 19950712; EP 0662525 B1 19970625; AT E154832 T1 19970715; DE 4400391 A1 19950713; DE 59403219 D1 19970731; US 5498299 A 19960312
DOCDB simple family (application)
EP 94202796 A 19940927; AT 94202796 T 19940927; DE 4400391 A 19940108; DE 59403219 T 19940927; US 31916694 A 19941006