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(11)

EP 4 247 987 A1

(12)

(43) Date of publication: 27.09.2023 Bulletin 2023/39 (21) Application number: 20815939.2 (22) Date of filing: 17.11.2020

(51) International Patent Classification (IPC):  C21D 9/04(2006.01) C22C 38/04(2006.01) C22C 38/18(2006.01) C22C 38/02(2006.01) C22C 38/06(2006.01) C21D 11/00(2006.01) (52) Cooperative Patent Classification (CPC): C21D 9/04; C22C 38/04; C22C 38/06; C21D 1/02; C21D 1/28; C22C 38/001; C22C 38/34; C22C 38/38; C22C 38/42; C22C 38/44; C22C 38/46; C22C 38/50; C22C 38/58; C22C 38/20; C22C 38/22; C22C 38/24; C22C 38/28; C21D 2211/009; C21D 8/005 (86) International application number: PCT/IB2020/060815 (87) International publication number: WO 2022/106864 (27.05.2022 Gazette 2022/21)

(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: CARRASCAL, Diego 33013 Oviedo Asturias (ES) ALVAREZ DIEZ, David 33440 Gozon Asturias (ES) ARANCON ALVAREZ, José 33007 Oviedo Asturias (ES) SOLANO ALVAREZ, Wilberth 33401 Aviles Asturias (ES) (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)