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EP 4 816 567 A1

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(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 23814255.8 (22) Date of filing: 27.11.2023

(51) International Patent Classification (IPC):  C21D 1/53(2006.01) C21D 1/84(2006.01) F27D 99/00(2010.01) F27D 17/00(2025.01) F27B 15/00(2006.01) C21D 9/00(2006.01) F28D 13/00(2006.01) (52) Cooperative Patent Classification (CPC): F28D 13/00; C21D 9/0081; C21D 1/53; F27B 15/00; F27D 2099/0066; F27D 17/10; C21D 1/56 (86) International application number: PCT/IB2023/061913 (87) International publication number: WO 2025/114741 (05.06.2025 Gazette 2025/23)

(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 (71) Applicant: ArcelorMittal 1160 Luxembourg (LU)

(72) Inventors: SALAME, Sarah 75015 Paris (FR) GARDIN, Pascal 57000 Metz (FR) GAUTHIER, Ségolène 54560 Audun-Le-Roman (FR) BOREAN, Jean-Luc 57190 Florange (FR) GRIFFAY, Gérard 57530 Coincy (FR) BANSAL, Akshay 57000 Metz (FR) BARROS LORENZO, José 57330 Hettange-Grande (FR) NORBERT, Raphaël 57280 Maizières-Les-Metz (FR) LEHMANN, Jean 57070 Metz (FR) BOISSIERE, Benjamin 59240 Dunkerque (FR) (74) Representative: Plaisant, Sophie Marie  ArcelorMittal France Research & Development Intellectual Property 6, rue André Campra 93200 Saint-Denis 93200 Saint-Denis (FR)