(19)

(11)

EP 2 739 758 A1

(12)

(43) Date of publication: 11.06.2014 Bulletin 2014/24 (21) Application number: 12746130.9 (22) Date of filing: 17.07.2012

(51) International Patent Classification (IPC):  C21D 8/10(2006.01) C21D 9/14(2006.01) B21B 17/14(2006.01) C21D 9/08(2006.01) B21B 17/10(2006.01) B21B 19/04(2006.01) (86) International application number: PCT/JP2012/068547 (87) International publication number: WO 2013/018564 (07.02.2013 Gazette 2013/06)

(84) Designated Contracting States: 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 (30) Priority: 01.08.2011 JP 2011168473 (71) Applicant: Nippon Steel & Sumitomo Metal Corporation Tokyo 100-8071 (JP)	(72) Inventor: HAYASHI, Chihiro Tokyo 100-8071 (JP) (74) Representative: Zimmermann & Partner  Josephspitalstr. 15 80331 München 80331 München (DE)