(19)

(11)

EP 2 729 587 A1

(12)

(43) Date of publication: 14.05.2014 Bulletin 2014/20 (21) Application number: 12808151.0 (22) Date of filing: 04.07.2012

(51) International Patent Classification (IPC):  C21D 1/673(2006.01) C21D 1/18(2006.01) C21D 1/20(2006.01) B21D 22/02(2006.01) C21D 1/19(2006.01) (86) International application number: PCT/SE2012/000104 (87) International publication number: WO 2013/006108 (10.01.2013 Gazette 2013/02)

(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: 06.07.2011 SE 1100523 (71) Applicant: Gestamp HardTech AB 971 25 Luleå (SE)	(72) Inventors: ERIKSSON, Katarina S-97632 Luleå (SE) LARSSON, Jan S-97242 Luleå (SE)