(19)

(11)

EP 4 824 312 A1

(12)

(43) Date of publication: 21.10.2026 Bulletin 2026/43 (21) Application number: 23825497.3 (22) Date of filing: 12.12.2023

(51) International Patent Classification (IPC):  C22C 38/44(2006.01) C22C 38/02(2006.01) C22C 38/06(2006.01) C22C 38/22(2006.01) C21D 1/06(2006.01) C21D 1/76(2006.01) C21D 6/02(2006.01) C21D 9/28(2006.01) C23C 8/20(2006.01) C22C 38/42(2006.01) C22C 38/04(2006.01) C22C 38/20(2006.01) C22C 38/00(2006.01) C21D 1/26(2006.01) C21D 6/00(2006.01) C21D 7/13(2006.01) C21D 9/32(2006.01) C23C 8/80(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/42; C22C 38/44; C22C 38/02; C22C 38/04; C22C 38/06; C22C 38/001; C22C 38/20; C22C 38/22; C21D 1/06; C21D 1/26; C21D 1/76; C21D 6/002; C21D 6/004; C21D 6/008; C21D 6/02; C21D 7/13; C21D 9/28; C21D 9/32; C23C 8/20; C23C 8/80; C21D 2211/008; C23C 8/02; C23C 8/22 (86) International application number: PCT/IB2023/062555 (87) International publication number: WO 2025/125865 (19.06.2025 Gazette 2025/25)

(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 (71) Applicant: ArcelorMittal 1160 Luxembourg (LU)	(72) Inventors: SMANIO, Véronique 57480 Malling (FR) PICOT, Thomas 57050 Le Ban Saint Martin (FR) (74) Representative: Plaisant, Sophie Marie  ArcelorMittal France Research & Development Intellectual Property 6, rue André Campra 93200 Saint-Denis 93200 Saint-Denis (FR)