(19)

(11)

EP 4 555 110 A1

(12)

(43) Date of publication: 21.05.2025 Bulletin 2025/21 (21) Application number: 23741398.4 (22) Date of filing: 12.07.2023

(51) International Patent Classification (IPC):  C21B 7/16(2006.01) (52) Cooperative Patent Classification (CPC): C21B 7/163 (86) International application number: PCT/EP2023/069402 (87) International publication number: WO 2024/013268 (18.01.2024 Gazette 2024/03)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 13.07.2022 LU 502500 (71) Applicant: Paul Wurth S.A. 1122 Luxembourg (LU)	(72) Inventor: MAGGIOLI, Nicolas 57100 Thionville (FR) (74) Representative: Office Freylinger  P.O. Box 48 8001 Strassen 8001 Strassen (LU)