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EP 4 396 388 A1

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(43) Date of publication: 10.07.2024 Bulletin 2024/28 (21) Application number: 21766708.8 (22) Date of filing: 31.08.2021

(51) International Patent Classification (IPC):  C22C 38/04(2006.01) C22C 38/02(2006.01) C22C 38/14(2006.01) C21D 9/46(2006.01) C21D 6/00(2006.01) C21D 1/18(2006.01) C22C 38/06(2006.01) C22C 38/12(2006.01) C22C 38/00(2006.01) C21D 8/02(2006.01) C21D 1/22(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/04; C22C 38/06; C22C 38/02; C22C 38/12; C22C 38/14; C22C 38/001; C22C 38/002; C21D 9/46; C21D 8/0205; C21D 8/0226; C21D 8/0263; C21D 8/02; C21D 6/005; C21D 1/18; C21D 1/22 (86) International application number: PCT/IB2021/057945 (87) International publication number: WO 2023/031647 (09.03.2023 Gazette 2023/10)

(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: KH MA MD TN (71) Applicant: ArcelorMittal 1160 Luxembourg (LU)

(72) Inventors: DE KNIJF, Dorien 9450 Denderhoutem Oost-Vlaanderen (BE) WATERSCHOOT, Tom 9160 Lokeren (BE) LORENZ, Ulrike 2070 Zwijndrecht (BE) DUPREZ, Lode 9050 Gentbrugge (BE) BRACKE, Lieven 9112 Sinaai-Waas (BE) (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)