(19)

(11)

EP 2 109 692 A1

(12)

(43) Date of publication: 21.10.2009 Bulletin 2009/43 (21) Application number: 08710001.2 (22) Date of filing: 12.02.2008

(51) International Patent Classification (IPC):  C22C 38/58(2006.01) C22C 38/38(2006.01) (86) International application number: PCT/IB2008/050499 (87) International publication number: WO 2008/099336 (21.08.2008 Gazette 2008/34)

(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 (30) Priority: 12.02.2007 IT RM20070069 (71) Applicant: ThyssenKrupp Acciai Speciali Terni S.p.A. 05100 Terni (IT)	(72) Inventors: RUFFINI, Federico I-00129 Roma RM (IT) ABBRUZZESE, Giuseppe I-00129 Roma RM (IT) SALAMONE, Gianvincenzo I-05100 Terni TR (IT) (74) Representative: Di Cerbo, Mario et al Società Italiana Brevetti S.p.A. Piazza di Pietra 38-39 00186 Roma 00186 Roma (IT)