EP 1872878 B1 20111228 - PROCESS FOR PRODUCING SEAMLESS TUBE
Title (en)
PROCESS FOR PRODUCING SEAMLESS TUBE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN ROHRS
Title (fr)
PROCÉDÉ DE FABRICATION DE TUBE SANS RACCORD
Publication
Application
Priority
- JP 2006306928 W 20060331
- JP 2005100978 A 20050331
Abstract (en)
[origin: EP1872878A1] The present invention provide a method of manufacturing seamless pipes comprising the steps of: the first coating step for forming a water-resistant coating by applying a first liquid onto the surface of a hot mandrel bar right after the previous elongation-rolling process; a water-cooling step for water-cooling the mandrel bar treated by the first coating step; a second coating step for applying a second liquid containing an inorganic lubricant which is excellent in high-temperature fluidity on the surface of the mandrel bar treated by the water-cooling step, then making the second liquid permeate into the water-resistant coating to give it high-temperature adhesion, and an elongation-rolling step. This elongation-rolling step is characterizing in that the elongation-rolling of a hollow shell shall be commenced in 10 seconds after the second coating step by using the mandrel bar.
IPC 8 full level
B21B 25/04 (2006.01); B21B 17/04 (2006.01)
CPC (source: EP)
B21B 25/04 (2013.01); B21B 17/04 (2013.01)
Designated contracting state (EPC)
DE FR IT
DOCDB simple family (publication)
EP 1872878 A1 20080102; EP 1872878 A4 20090121; EP 1872878 B1 20111228; BR PI0609605 A2 20100420; BR PI0609605 B1 20190702; CN 101208160 A 20080625; CN 101208160 B 20100519; JP 4705096 B2 20110622; JP WO2006106961 A1 20080918; WO 2006106961 A1 20061012
DOCDB simple family (application)
EP 06730876 A 20060331; BR PI0609605 A 20060331; CN 200680010501 A 20060331; JP 2006306928 W 20060331; JP 2007511196 A 20060331