EP 2883627 B1 20170412 - METHOD OF PRODUCING STEEL PIPE
Title (en)
METHOD OF PRODUCING STEEL PIPE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES STAHLROHRS
Title (fr)
PROCÉDÉ DE FABRICATION DE TUYAU EN ACIER
Publication
Application
Priority
JP 2012070321 W 20120809
Abstract (en)
[origin: EP2883627A1] In a method of producing a steel pipe by shaping a steel plate subjected to edge bending into a cylindrical form through plural times of three-point bending press in widthwise direction and welding the seams thereof to form a non-expanded pipe (1), inserting a pipe expander provided with plural expander tools (2) into an inside of the non-expanded pipe to perform pipe expanding, the expander tools (2) are pushed onto all sites of non-deformation areas (9) in three-point bending press to perform pipe expanding, whereby a steel pipe having an excellent roundness is produced in a high productivity. Moreover, the number of times of the three-point press bending in the above production method is (aN - 1) wherein a is an integer of 1, 2 or the like when the number of the expander tools is N.
IPC 8 full level
B21D 5/01 (2006.01); B21C 37/08 (2006.01); B21D 39/20 (2006.01)
CPC (source: CN EP KR RU)
B21C 37/0815 (2013.01 - KR); B21D 5/01 (2013.01 - RU); B21D 5/015 (2013.01 - CN EP KR); B21D 37/00 (2013.01 - RU); B21D 39/20 (2013.01 - CN EP KR); B21C 37/0815 (2013.01 - EP)
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 2883627 A1 20150617; EP 2883627 A4 20150826; EP 2883627 B1 20170412; CA 2880661 A1 20140213; CA 2880661 C 20180522; CN 104271279 A 20150107; CN 104271279 B 20161207; IN 990DEN2015 A 20150612; KR 101712885 B1 20170307; KR 20150020694 A 20150226; RU 2015108026 A 20160927; RU 2601844 C2 20161110; WO 2014024287 A1 20140213
DOCDB simple family (application)
EP 12882736 A 20120809; CA 2880661 A 20120809; CN 201280072770 A 20120809; IN 990DEN2015 A 20150206; JP 2012070321 W 20120809; KR 20157000993 A 20120809; RU 2015108026 A 20120809