(19)

(11)

EP 2 814 628 A1

(12)

(43) Date of publication: 24.12.2014 Bulletin 2014/52 (21) Application number: 13707508.1 (22) Date of filing: 15.02.2013

(51) International Patent Classification (IPC):  B21D 37/20(2006.01) B24B 39/00(2006.01) C21D 7/06(2006.01) B21D 41/00(2006.01) B24C 1/10(2006.01) (86) International application number: PCT/US2013/026439 (87) International publication number: WO 2013/123396 (22.08.2013 Gazette 2013/34)

(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: 17.02.2012 US 201261600373 P (71) Applicant: Alcoa Inc. Pittsburgh, PA 15212-5858 (US)	(72) Inventors: DICK, Robert, E. Cheswick, PA 15024 (US) FEDUSA, Anthony, J. Lower Burrell, PA 15068 (US) MYERS, Gary, L. Sarver, PA 16055 (US) (74) Representative: Trinks, Ole  Meissner, Bolte & Partner GbR Widenmayerstraße 47 80538 München 80538 München (DE)