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(11)

EP 4 217 518 A1

(12)

(43) Date of publication: 02.08.2023 Bulletin 2023/31 (21) Application number: 20786070.1 (22) Date of filing: 23.09.2020

(51) International Patent Classification (IPC):  C21D 9/02(2006.01) C22C 38/02(2006.01) C22C 38/06(2006.01) C22C 38/44(2006.01) C22C 38/48(2006.01) C22C 38/54(2006.01) C21D 6/00(2006.01) C22C 38/00(2006.01) C22C 38/04(2006.01) C22C 38/42(2006.01) C22C 38/46(2006.01) C22C 38/50(2006.01) C21D 1/25(2006.01) C21D 7/13(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/001; C22C 38/02; C22C 38/04; C22C 38/06; C22C 38/42; C22C 38/44; C22C 38/46; C22C 38/54; C22C 38/48; C22C 38/50; C21D 9/02; C21D 2211/008; C21D 2211/001; C21D 1/25; C21D 7/13; C21D 6/004; C21D 6/005 (86) International application number: PCT/IB2020/058883 (87) International publication number: WO 2022/064249 (31.03.2022 Gazette 2022/13)

(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: JACHMICH, Jean-Michel 57100 Thionville (FR) MICHAUT, Bertrand 57000 Metz (FR) LORICH, Laurent 57525 Talange (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)