(19)

(11)

EP 3 580 362 A1

(12)

(43) Date of publication: 18.12.2019 Bulletin 2019/51 (21) Application number: 18706216.1 (22) Date of filing: 08.02.2018

(51) International Patent Classification (IPC):  C22B 1/24(2006.01) (86) International application number: PCT/EP2018/053140 (87) International publication number: WO 2018/146183 (16.08.2018 Gazette 2018/33)

(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 Designated Validation States: MA MD TN (30) Priority: 10.02.2017 LU 100075 (71) Applicant: Paul Wurth S.A. 1122 Luxembourg (LU)	(72) Inventors: STRÜBER, Georg 5960 Itzig (LU) NOUAILLE-DEGORCE, Gilles 2134 Luxembourg (LU) (74) Representative: Office Freylinger  P.O. Box 48 8001 Strassen 8001 Strassen (LU)