EP 2786814 B1 20170802 - METHOD FOR MANUFACTURING SEAMLESS PIPE
Title (en)
METHOD FOR MANUFACTURING SEAMLESS PIPE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN ROHRS
Title (fr)
PROCÉDÉ DE FABRICATION DE TUBE SANS SOUDURE
Publication
Application
Priority
- JP 2012110569 A 20120514
- JP 2013000596 W 20130204
Abstract (en)
[origin: EP2786814A1] A method of manufacturing a seamless steel pipe including the steps of: providing a hollow billet with a mandrel inserted therein and forging the hollow billet into a primary hollow shell of a predetermined diameter and thickness; subjecting the primary hollow shell to diameter reduction at one end portion thereof; and providing the primary hollow shell with a mandrel inserted therein, the primary hollow shell having the diameter reduced portion at the one end portion thereof, and subjecting the primary hollow shell to push-drawing using a push bench. With this method, it is possible to manufacture seamless steel pipes of a wide range of manufacturable sizes (large diameter or thick-walled pipes) with high dimensional accuracy, particularly with high wall thickness accuracy.
IPC 8 full level
CPC (source: EP)
B21C 1/26 (2013.01); B21K 1/063 (2013.01)
Citation (examination)
- DE 19852537 A1 20000518 - MANNESMANN AG [DE]
- FR 2443884 A1 19800711 - VALLOUREC
- US 4577481 A 19860325 - STAAT KARLHANS [DE]
- GB 744447 A 19560208 - REISHOLZ STAHL & ROEHRENWERK
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 2786814 A1 20141008; EP 2786814 A4 20150812; EP 2786814 B1 20170802; CN 103974788 A 20140806; CN 103974788 B 20150826; ES 2645985 T3 20171211; JP 5387797 B1 20140115; JP WO2013171935 A1 20160107; WO 2013171935 A1 20131121
DOCDB simple family (application)
EP 13791398 A 20130204; CN 201380004151 A 20130204; ES 13791398 T 20130204; JP 2013000596 W 20130204; JP 2013505233 A 20130204