(19)

(11)

EP 2 817 428 A1

(12)

(43) Date of publication: 31.12.2014 Bulletin 2015/01 (21) Application number: 13704616.5 (22) Date of filing: 19.02.2013

(51) International Patent Classification (IPC):  C22C 38/00(2006.01) C22C 38/06(2006.01) C22C 38/14(2006.01) C22C 38/04(2006.01) C22C 38/12(2006.01) C21D 9/46(2006.01) (86) International application number: PCT/EP2013/053257 (87) International publication number: WO 2013/124264 (29.08.2013 Gazette 2013/35)

(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 Designated Extension States: BA ME (30) Priority: 20.02.2012 EP 12156180 21.03.2012 EP 12160499 (71) Applicant: Tata Steel Nederland Technology B.V. 1970 CA IJmuiden (NL)	(72) Inventors: LIU, Cheng NL-1970 CA IJmuiden (NL) RANA, Radhakanta NL-1970 CA IJmuiden (NL) (74) Representative: Bodin, Andre  Tata Steel Nederland Technology BV Group Intellectual Property Services PO Box 10000-3G.37 1970 CA IJmuiden 1970 CA IJmuiden (NL)