EP 1637241 B1 20120912 - METHOD OF MANUFACTURING A SEAMLESS STEEL PIPE USING AN FE- CR- ALLOY
Title (en)
METHOD OF MANUFACTURING A SEAMLESS STEEL PIPE USING AN FE- CR- ALLOY
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN ROHRES AUS EINER FE- CR- LEGIERUNG
Title (fr)
PROCEDE DE FABRICATION D' UN TUBE SANS SOUDURE D'UN ALLIAGE FE- CR
Publication
Application
Priority
- JP 2004007223 W 20040520
- JP 2003144557 A 20030522
Abstract (en)
[origin: EP1637241A1] Fe-Cr alloy billet manufacturing method according to the present invention, since the blooming is carried out with the high reduction rate surface of the steel strip covered with a scale layer of a large area rate as 70 % or more and without the descaling applied, can reduce the indentation and inclusion of the scale. Thereby, in the case of a billet for use in seamless steel pipes being manufactured from a steel strip of a Fe-Cr alloy, surface treatment before tube-making can be largely reduced. Thereby, when the Fe-Cr alloy billet is adopted in manufacturing seamless steel pipes, since even the Fe-Cr alloy steel pipe relatively hard to process can be manufactured at low manufacturing cost and efficiently, it can be widely applied in a field of manufacturing hot seamless steel pipes.
IPC 8 full level
B21B 1/02 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01); B21B 3/02 (2006.01); B21B 9/00 (2006.01); B21B 45/00 (2006.01)
CPC (source: EP)
B21B 1/026 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/18 (2013.01); B21B 3/02 (2013.01); B21B 9/00 (2013.01); B21B 45/00 (2013.01); B21B 2001/022 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1637241 A1 20060322; EP 1637241 A4 20070328; EP 1637241 B1 20120912; BR PI0410554 A 20060620; BR PI0410554 B1 20140408; CA 2525147 A1 20041202; CA 2525147 C 20090818; CN 100417460 C 20080910; CN 1791477 A 20060621; JP 4265603 B2 20090520; JP WO2004103589 A1 20060720; MX PA05012509 A 20060208; RU 2005140109 A 20070710; RU 2313409 C2 20071227; WO 2004103589 A1 20041202; ZA 200510009 B 20061227
DOCDB simple family (application)
EP 04734124 A 20040520; BR PI0410554 A 20040520; CA 2525147 A 20040520; CN 200480013890 A 20040520; JP 2004007223 W 20040520; JP 2005506403 A 20040520; MX PA05012509 A 20040520; RU 2005140109 A 20040520; ZA 200510009 A 20051209