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EP 4 114 994 A1

(12)

(43) Date of publication: 11.01.2023 Bulletin 2023/02 (21) Application number: 21703775.3 (22) Date of filing: 08.02.2021

(51) International Patent Classification (IPC):  C21D 8/02(2006.01) C22C 38/02(2006.01) C22C 38/26(2006.01) C22C 38/32(2006.01) C21D 9/46(2006.01) C22C 38/22(2006.01) C22C 38/28(2006.01) C22C 38/38(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/02; C22C 38/38; C22C 38/32; C22C 38/22; C22C 38/26; C22C 38/28; C21D 9/46; C21D 2211/002; C21D 2211/005; C21D 2211/008; C21D 8/0205; C21D 8/0273; C21D 8/0236; C21D 8/0226 (86) International application number: PCT/IB2021/050994 (87) International publication number: WO 2021/176285 (10.09.2021 Gazette 2021/36)

(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 (30) Priority: 02.03.2020 WO PCT/IB2020/051750 (71) Applicant: ArcelorMittal 1160 Luxembourg (LU)	(72) Inventors: INACIO DA ROSA, Gregory 57000 Metz (FR) ZHAO, Lijia Highland, Indiana 46322 (US) FAN, Dongwei Munster, Indiana 46321 (US) DRILLET, Josée 57160 Rozérieulles (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)