EP 2656935 B1 20161102 - PROCESS FOR MANUFACTURE OF SEAMLESS STEEL PIPE
Title (en)
PROCESS FOR MANUFACTURE OF SEAMLESS STEEL PIPE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN STAHLROHRES
Title (fr)
PROCÉDÉ DE FABRICATION D'UN TUBE D'ACIER SANS SOUDURE
Publication
Application
Priority
- JP 2010285670 A 20101222
- JP 2011007092 W 20111220
Abstract (en)
[origin: EP2656935A1] When performing piercing-rolling by use of a plug with a protection film on its surface, applying a lubricant made of an aqueous solution containing a total of 5 to 30% mass% of one or more of boron oxide, boric acid, and amine borate to the protection film on the plug surface, and using this plug for piercing-rolling makes it possible to realize the increase of the life of plug for piecing-rolling without reducing the efficiency of piercing-rolling, consequently allowing the efficient production of a seamless steel tube/pipe. Moreover, it is preferable that the plug is cooled after the piecing-rolling, the application of the above described lubricant is performed when the surface temperature of the front edge of plug decreases to 100°C or less, and the plug is reused for the piercing-rolling. In this occasion, it is preferable that the protection film on the plug surface is formed by arc spraying iron wire material onto the surface of the base metal of plug, and comprises oxides and Fe.
IPC 8 full level
B21B 19/04 (2006.01); B21B 25/04 (2006.01)
CPC (source: EP US)
B21B 19/04 (2013.01 - EP US); B21B 25/04 (2013.01 - EP US); C10M 173/02 (2013.01 - EP US); C10M 2201/087 (2013.01 - EP US); C10M 2201/0873 (2013.01 - EP US); C10M 2201/1033 (2013.01 - EP US); C10N 2040/241 (2020.05 - EP US); C10N 2040/247 (2020.05 - EP US); C10N 2050/02 (2013.01 - EP US)
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 2656935 A1 20131030; EP 2656935 A4 20150909; EP 2656935 B1 20161102; BR 112013013743 A2 20160913; BR 112013013743 B1 20200728; BR 112013013743 B8 20201117; CN 103269809 A 20130828; CN 103269809 B 20150513; JP 2012130945 A 20120712; JP 5142232 B2 20130213; MX 2013006659 A 20130729; MX 345492 B 20170202; US 2013269407 A1 20131017; WO 2012086177 A1 20120628
DOCDB simple family (application)
EP 11850562 A 20111220; BR 112013013743 A 20111220; CN 201180062206 A 20111220; JP 2010285670 A 20101222; JP 2011007092 W 20111220; MX 2013006659 A 20111220; US 201113996128 A 20111220