EP 2170540 A1 20100407 - METHOD FOR THE PRODUCTION OF HOT-FINISHED SEAMLESS PIPES HAVING OPTIMIZED FATIGUE PROPERTIES IN THE WELDED STATE
Title (en)
METHOD FOR THE PRODUCTION OF HOT-FINISHED SEAMLESS PIPES HAVING OPTIMIZED FATIGUE PROPERTIES IN THE WELDED STATE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON WARMGEFERTIGTEN NAHTLOSEN ROHREN MIT OPTIMIERTEN ERMÜDUNGSEIGENSCHAFTEN IM VERSCHWEISSTEN ZUSTAND
Title (fr)
PROCÉDÉ DE FABRICATION DE TUBES SANS SOUDURE FABRIQUÉS THERMIQUEMENT À PROPRIÉTÉS OPTIMISÉES DE FATIGUE À L'ÉTAT SOUDÉ
Publication
Application
Priority
- DE 2008001064 W 20080626
- DE 102007034895 A 20070724
Abstract (en)
[origin: CA2694469A1] The invention relates to a method for the production of hot-finished, particularly hot-rolled, seamless pipes having optimized fatigue properties in the welded state, having an outside diameter of up to 711 mm and a nominal wall thickness of up to 100 mm, made of metal, in particular steel. After hot or finish rolling, a defined pipe cross-section is produced on at least one pipe end across a predetermined length, having tight tolerances for inside and outside diameters, wherein the cross-section can then be welded to the pipe end of another pipe. According to the invention, in a region a wall thickness is created in a first step at the pipe end in question, the thickness being bigger than on the remaining pipe body, wherein the outside diameter is increased and/or the inside diameter is reduced. In a second step, the required pipe cross-section is produced in said region by mechanical machining, and the transition from the machined to the unmachined region of the pipe is produced with low surface roughness and almost notch-free, and the residual wall thickness remaining in the machining region is within the required tolerances.
IPC 8 full level
B21J 5/08 (2006.01); B21K 21/12 (2006.01)
CPC (source: EP KR US)
B21J 5/08 (2013.01 - EP KR US); B21K 21/12 (2013.01 - EP KR US)
Citation (search report)
See references of WO 2009012744A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
DE 102007034895 A1 20090129; AR 067641 A1 20091021; AU 2008280642 A1 20090129; AU 2008280642 A2 20100527; AU 2008280642 B2 20140410; BR PI0814347 A2 20150127; BR PI0814347 B1 20201013; CA 2694469 A1 20090129; CA 2694469 C 20151124; CN 101827666 A 20100908; CN 101827666 B 20121226; EA 015222 B1 20110630; EA 201000234 A1 20100630; EP 2170540 A1 20100407; EP 2170540 B1 20120808; JP 2010534136 A 20101104; JP 5165757 B2 20130321; KR 101499631 B1 20150306; KR 20100039351 A 20100415; MX 2010000815 A 20100301; UA 96827 C2 20111212; US 2010326557 A1 20101230; US 9718116 B2 20170801; WO 2009012744 A1 20090129
DOCDB simple family (application)
DE 102007034895 A 20070724; AR P080103166 A 20080722; AU 2008280642 A 20080626; BR PI0814347 A 20080626; CA 2694469 A 20080626; CN 200880100113 A 20080626; DE 2008001064 W 20080626; EA 201000234 A 20080626; EP 08773277 A 20080626; JP 2010517263 A 20080626; KR 20107001560 A 20080626; MX 2010000815 A 20080626; UA A201002005 A 20080626; US 67023008 A 20080626