(19)

(11)

EP 2 547 975 A1

(12)

(43) Date of publication: 23.01.2013 Bulletin 2013/04 (21) Application number: 11710152.7 (22) Date of filing: 11.03.2011

(51) International Patent Classification (IPC):  F27B 1/16(2006.01) C21B 7/16(2006.01) F27D 3/16(2006.01) C21B 9/12(2006.01) (86) International application number: PCT/EP2011/053698 (87) International publication number: WO 2011/113761 (22.09.2011 Gazette 2011/38)

(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: 15.03.2010 LU 91665 (71) Applicant: Paul Wurth S.A. 1122 Luxembourg (LU)	(72) Inventors: HUTMACHER, Patrick L-3282 Bettembourg (LU) BERMER, Gilles L-4950 Bascharage (LU) THILLEN, Guy L-9234 Diekirch (LU) (74) Representative: Office Freylinger  P.O. Box 48 8001 Strassen 8001 Strassen (LU)