(19)

(11)

EP 4 448 809 A1

(12)

(43) Date of publication: 23.10.2024 Bulletin 2024/43 (21) Application number: 22826224.2 (22) Date of filing: 13.12.2022

(51) International Patent Classification (IPC):  C21D 1/26(2006.01) C21D 9/46(2006.01) F27B 9/04(2006.01) C21D 1/76(2006.01) C21D 9/56(2006.01) F27D 7/02(2006.01) (52) Cooperative Patent Classification (CPC): C21D 1/76; C21D 1/26; C21D 9/46; C21D 9/561; C21D 11/00 (86) International application number: PCT/IB2022/062128 (87) International publication number: WO 2023/111837 (22.06.2023 Gazette 2023/25)

(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 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: 14.12.2021 WO PCT/IB2021/061686 (71) Applicant: ArcelorMittal 1160 Luxembourg (LU)	(72) Inventors: KHELASSI, Ahmed 57950 Montigny-Lès-Metz (FR) DAL'MAZ SILVA, Walter 57000 Metz (FR) PLUNIAN, Morvan 57000 Metz (FR) (74) Representative: Plaisant, Sophie Marie  ArcelorMittal France Research & Development Intellectual Property 6, rue André Campra Immeuble Le Cézanne 93200 Saint-Denis 93200 Saint-Denis (FR)