EP 1437422 A4 20060823 - STEEL PIPE HAVING HIGH FORMABILITY AND METHOD FOR PRODUCTION THEREOF
Title (en)
STEEL PIPE HAVING HIGH FORMABILITY AND METHOD FOR PRODUCTION THEREOF
Title (de)
LEICHT VERFORMBARES STAHLROHR UND VERFAHREN ZUR HERSTELLUNG.
Title (fr)
TUYAU EN ACIER A HAUTE FORMABILITE, ET PROCEDE DE FABRICATION
Publication
Application
Priority
JP 0105053 W 20010614
Abstract (en)
[origin: EP1437422A1] The steel tube has 'r' values of 1.2 or more along longitudinal direction and 1.6 or more in whole area of circumference including seam zone. The tube is formed by subjecting a hoop to electric welding at Ac1 temperature and to reduction rolling at 30% reduction ratio in temperature range of 600[deg]C to Ac3.
IPC 1-7
IPC 8 full level
B21B 17/14 (2006.01); B21C 37/06 (2006.01); B21C 37/08 (2006.01); C21D 8/10 (2006.01); C21D 9/08 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01)
CPC (source: EP)
B21C 37/06 (2013.01); B21C 37/08 (2013.01); C21D 8/10 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); B21B 17/14 (2013.01); C21D 9/08 (2013.01)
Citation (search report)
- [Y] DE 4318931 C1 19941201 - MANNESMANN AG [DE]
- [Y] US 4414042 A 19831108 - GROSS HEINZ [DE], et al
- See references of WO 02103069A1
Citation (examination)
- JP 2002275533 A 20020925 - NIPPON STEEL CORP
- JP H04143015 A 19920518 - SUMITOMO METAL IND
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 1437422 A1 20040714; EP 1437422 A4 20060823; BR 0110441 A 20030701; BR 0110441 B1 20130618; CA 2403830 A1 20021214; CA 2403830 C 20090630; CN 1234896 C 20060104; CN 1426489 A 20030625; WO 02103069 A1 20021227
DOCDB simple family (application)
EP 01938656 A 20010614; BR 0110441 A 20010614; CA 2403830 A 20010614; CN 01808620 A 20010614; JP 0105053 W 20010614