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(11)

EP 4 065 754 A1

(12)

(43) Date of publication: 05.10.2022 Bulletin 2022/40 (21) Application number: 19809651.3 (22) Date of filing: 25.11.2019

(51) International Patent Classification (IPC):  C25F 1/00(2006.01) C25F 1/06(2006.01) C23G 1/36(2006.01) B21B 45/06(2006.01) C25F 7/02(2006.01) C23G 1/02(2006.01) (52) Cooperative Patent Classification (CPC): C25F 1/06; C25F 7/02; C23G 3/021; C23G 3/027; C23G 1/36; C25F 7/00 (86) International application number: PCT/IB2019/060108 (87) International publication number: WO 2021/105738 (03.06.2021 Gazette 2021/22)

(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: KOLTSOV, Alexey 57910 Neufgrange (FR) ALEXANDRE, Patrice 57070 Metz (FR) THEYSSIER, Marie-Christine 57000 Metz (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)