EP 2864520 B1 20180926 - PROCESS FOR THE ANTI-OXIDISING SURFACE TREATMENT OF STEEL PARTS
Title (en)
PROCESS FOR THE ANTI-OXIDISING SURFACE TREATMENT OF STEEL PARTS
Title (de)
VERFAHREN FÜR ANTIOXIDIERENDE OBERFLÄCHENBEHANDLUNG VON STAHLTEILEN
Title (fr)
PROCÉDÉ DE TRAITEMENT ANTIOXYDANT DE SURFACES DE PIÈCES EN ACIER
Publication
Application
Priority
IT 2012000198 W 20120626
Abstract (en)
[origin: WO2014002120A1] A process and a plant are described, for the anti- oxidising surface treatment of steel parts, that perform the steps of: washing or de-greasing a charge of components; nitriding under gaseous phase the charge, composed of the sub-steps of: pre- heating with nitrogen till a temperature of 350 °C; heating from 350 °C to 450 °C in an atmosphere composed of a mixture containing C02 and N2; heating from 450 °C to 520 - 600 °C for half an hour in an atmosphere containing N2; maintaining, at the" same temperature of 520 - 600 °C, for a period from 2 to 10 hours,. in an atmosphere composed of a mixture containing NH3 and N2; washing with nitrogen the environment where said nitriding occurred; and steam oxidising, consisting in the immission of overheated steam at a temperature in the range from 490 °C and 540 °C for the necessary time to obtain a complete oxigen-iron exchange.
IPC 8 full level
C23C 8/02 (2006.01); C23C 8/14 (2006.01); C23C 8/18 (2006.01); C23C 8/26 (2006.01); C23C 8/34 (2006.01); C23C 8/80 (2006.01)
CPC (source: CN EP)
C23C 8/02 (2013.01 - CN EP); C23C 8/14 (2013.01 - CN EP); C23C 8/18 (2013.01 - CN EP); C23C 8/26 (2013.01 - CN EP); C23C 8/34 (2013.01 - CN EP); C23C 8/80 (2013.01 - CN EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2014002120 A1 20140103; BR 112014032480 A2 20170627; CN 104603319 A 20150506; CN 104603319 B 20171010; EP 2864520 A1 20150429; EP 2864520 B1 20180926; IN 144MUN2015 A 20151016
DOCDB simple family (application)
IT 2012000198 W 20120626; BR 112014032480 A 20120626; CN 201280074169 A 20120626; EP 12766159 A 20120626; IN 144MUN2015 A 20150120