Global Patent Index - EP 2027947 A1

EP 2027947 A1 20090225 - Method for the production of alloy pipes for heat exchangers using precipitation hardening through underwater extrusion

Title (en)

Method for the production of alloy pipes for heat exchangers using precipitation hardening through underwater extrusion

Title (de)

Verfahren zur Herstellung von Legierungsrohren für Wärmetauscher unter Verwendung von Ausscheidungshärtung anhand eines Unterwasser-Extrusionsverfahren

Title (fr)

Procédé pour la production de tuyaux en alliage pour échangeurs de chaleurs utilisant un durcissement par précipitation par extrusion sous l'eau

Publication

EP 2027947 A1 20090225 (EN)

Application

EP 07425533 A 20070814

Priority

EP 07425533 A 20070814

Abstract (en)

Production method for heat exchanger pipes comprising the following stages: a) production of a billet in an alloy suitable for hardening through precipitation; b) direct hot extrusion under hydrostatic head in a water bath, of the billet previously heated to a temperature equal to or higher than the solution heat treatment of the alloy, in order to construct an extruded pipe blank of a pre-determined size; c) cold rolling of the extruded pipe blank to obtain a rolled blank having a reduced transversal measurement and consequently having an increased length; d) subjecting the rolled blank to a straight drawing process to obtain a semi-finished pipe; e) subjecting the semi-finished pipe to spinner drawing to reduce the transversal measurement and consequently, to obtain a pipe having its definitive size; f) subjecting the pipe to annealing in a tunnel furnace in a manner to determine the hardening of the pipe through precipitation.

IPC 8 full level

B21C 1/00 (2006.01); B21B 23/00 (2006.01); B21C 23/08 (2006.01); C22F 1/00 (2006.01); C22F 1/08 (2006.01)

CPC (source: EP)

B21C 1/00 (2013.01); B21C 23/085 (2013.01); C22C 9/00 (2013.01); C22F 1/002 (2013.01); C22F 1/08 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

Designated extension state (EPC)

AL BA HR MK RS

DOCDB simple family (publication)

EP 2027947 A1 20090225; EP 2027947 B1 20110406; AT E504366 T1 20110415; DE 602007013750 D1 20110519; ES 2366979 T3 20111027; PL 2027947 T3 20110930; PT 2027947 E 20110712

DOCDB simple family (application)

EP 07425533 A 20070814; AT 07425533 T 20070814; DE 602007013750 T 20070814; ES 07425533 T 20070814; PL 07425533 T 20070814; PT 07425533 T 20070814