EP 2286934 B1 20150304 - HIGH-ALLOY SEAMLESS STEEL PIPE MANUFACTURING METHOD
Title (en)
HIGH-ALLOY SEAMLESS STEEL PIPE MANUFACTURING METHOD
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN HOCHLEGIERUNGSSTAHLROHRS
Title (fr)
PROCÉDÉ DE FABRICATION DE TUBE EN ACIER SANS SOUDURE À ALLIAGE ÉLEVÉ
Publication
Application
Priority
- JP 2008072006 W 20081204
- JP 2008087150 A 20080328
Abstract (en)
[origin: EP2286934A1] Pipe-swelling can be prevented by piercing-rolling a high-alloy steel billet heated to a temperature range from 900 to 1250°C with a piercing mill equipped with main rolls having a surface roughness R max of 150 to 500 µm. A ratio (the gap W G of guide rolls/the gap W R of the main rolls) is preferably at 1.10 to 1.20. The difference (¸ P - ¸ R ) is preferably set at 0 to 3.0°, where ¸ R is an angle between an exit-side face of each of the main rolls of the piercing mill and the pass line; and ¸ P is an angle between a rolling face of the piercing plug and the pass line.
IPC 8 full level
B21B 19/04 (2006.01); B21B 27/00 (2006.01); B21B 27/02 (2006.01); B21B 27/10 (2006.01)
CPC (source: EP US)
B21B 19/04 (2013.01 - EP US); B21B 23/00 (2013.01 - EP US); B21B 27/025 (2013.01 - EP US); B21B 45/004 (2013.01 - EP US); B21B 2027/103 (2013.01 - EP US); B21B 2267/10 (2013.01 - EP US)
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
DOCDB simple family (publication)
EP 2286934 A1 20110223; EP 2286934 A4 20131009; EP 2286934 B1 20150304; BR PI0822466 A2 20150616; BR PI0822466 B1 20200422; CN 101980801 A 20110223; CN 101980801 B 20121205; JP 2009241075 A 20091022; JP 4371247 B2 20091125; MX 2010010438 A 20101215; US 2011023570 A1 20110203; WO 2009118957 A1 20091001
DOCDB simple family (application)
EP 08873626 A 20081204; BR PI0822466 A 20081204; CN 200880128345 A 20081204; JP 2008072006 W 20081204; JP 2008087150 A 20080328; MX 2010010438 A 20081204; US 88710010 A 20100921