(19)

(11)

EP 2 513 344 A1

(12)

(43) Date of publication: 24.10.2012 Bulletin 2012/43 (21) Application number: 10798043.5 (22) Date of filing: 15.12.2010

(51) International Patent Classification (IPC):  C21B 7/10(2006.01) F27D 9/00(2006.01) F27D 1/12(2006.01) F28D 15/02(2006.01) (86) International application number: PCT/EP2010/069689 (87) International publication number: WO 2011/073223 (23.06.2011 Gazette 2011/25)

(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: 18.12.2009 LU 91633 (71) Applicant: Paul Wurth S.A. 1122 Luxembourg (LU)	(72) Inventors: THILLEN, Guy L-9234 Diekirch (LU) HAUSEMER, Lionel L-5231 Sandweiler (LU) MAGGIOLI, Nicolas F-57100 Thionville (FR) (74) Representative: Office Freylinger  P.O. Box 48 8001 Strassen 8001 Strassen (LU)