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EP 2 225 402 A1

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(43) Date of publication: 08.09.2010 Bulletin 2010/36 (21) Application number: 08855006.6 (22) Date of filing: 11.11.2008

(51) International Patent Classification (IPC):  C21D 1/673(2006.01) B21D 47/01(2006.01) C23C 8/80(2006.01) B21D 22/00(2006.01) C21D 8/00(2006.01) (86) International application number: PCT/SE2008/000637 (87) International publication number: WO 2009/070078 (04.06.2009 Gazette 2009/23)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 26.11.2007 SE 0702597 (71) Applicant: Gestamp HardTech AB 971 25 Luleå (SE)	(72) Inventors: ÅKERSTRÖM, Paul S-955 31 Råneå (SE) LARSSON, Jan, Erik S-972 42 Luleå (SE) (74) Representative: Aslund, G Roland  Avesta Patentbyrå KB P.O. Box 99 775 26 Krylbo 775 26 Krylbo (SE)