EP 2573194 A4 20141203 - METHOD AND DEVICE FOR HEAT TREATING RAILS
Title (en)
METHOD AND DEVICE FOR HEAT TREATING RAILS
Title (de)
VERFAHREN UND VORRICHTUNG ZUR WÄRMEBEHANDLUNG VON SCHIENEN
Title (fr)
PROCÉDÉ ET DISPOSITIF DE TRAITEMENT THERMIQUE DE RAILS
Publication
Application
Priority
- RU 2010145748 A 20101111
- RU 2011000819 W 20111021
Abstract (en)
[origin: WO2012064223A1] The invention relates to the iron and steel industry, more specifically to methods and devices for heat treating railway rails. The technical result is a universal method and device which can be used to heat treat rails made from non-alloyed carbon steels as well as rails made from alloyed steels. The method makes it possible to cool rails at cooling rates within a range of 2-20°C/s, smoothly adjust the cooling rates during the heat treatment process, produce a uniform fine pearlite structure (tempered sorbite) to a depth of more than 22 mm from the surface and produce a running surface hardness of up to HB401. The cooling capacity of a gaseous medium is regulated according to a programmed regime by means of the pulsed, quasi-continuous and/or the continuous injection of water into a stream of air. Depending on the chemical composition of the rail steel and the initial temperature of the rail not lower than the austenitizing temperature, the consumption of gaseous medium is regulated from 20 to 60 m3/min per linear metre of rail, while the consumption of injected water is up to 12 l/min per linear metre of rail. Furthermore, the amount of water in the gaseous medium is up to 0.2 litres of water per cubic metre of air. The pressure of the gaseous medium is regulated within a range of 0.005 to 0.1 MPa.
IPC 8 full level
C21D 9/04 (2006.01); C21D 1/613 (2006.01); C21D 1/667 (2006.01); C21D 10/00 (2006.01); C21D 11/00 (2006.01)
CPC (source: EP)
C21D 1/613 (2013.01); C21D 1/667 (2013.01); C21D 9/04 (2013.01); C21D 10/005 (2013.01); C21D 11/00 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/46 (2013.01); C21D 2211/009 (2013.01)
Citation (search report)
- [X] DE 19503747 A1 19960808 - SCHLOEMANN SIEMAG AG [DE]
- [X] WO 2008077166 A2 20080703 - KNORR TECHNIK GMBH [AT], et al
- [A] DE 2148722 A1 19720510 - WENDEL SIDELOR
- [A] JP S6289818 A 19870424 - NIPPON KOKAN KK
- [A] US 5004510 A 19910402 - YU MENG W [CN], et al
- [A] EP 0247021 A2 19871125 - VOEST ALPINE AG [AT]
- [A] US 4953832 A 19900904 - KOTSCH GARY D [US], et al
- See references of WO 2012064223A1
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)
EP 2573194 A1 20130327; EP 2573194 A4 20141203; EP 2573194 B1 20170426; EA 022297 B1 20151230; EA 201300204 A1 20130628; ES 2627814 T3 20170731; PL 2573194 T3 20171031; RU 2010145748 A 20120520; RU 2456352 C1 20120720; UA 104835 C2 20140311; WO 2012064223 A1 20120518
DOCDB simple family (application)
EP 11839429 A 20111021; EA 201300204 A 20111021; ES 11839429 T 20111021; PL 11839429 T 20111021; RU 2010145748 A 20101111; RU 2011000819 W 20111021; UA A201306997 A 20111021