(19)

(11)

EP 3 969 628 A1

(12)

(43) Date of publication: 23.03.2022 Bulletin 2022/12 (21) Application number: 20716219.9 (22) Date of filing: 30.03.2020

(51) International Patent Classification (IPC):  C21D 8/02(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/42; C22C 38/44; C22C 38/46; C22C 38/58; C22C 38/50; C22C 38/54; C22C 38/48; C22C 38/06; C22C 38/02; C22C 38/001; C21D 9/48; C21D 8/041; C21D 8/0426; C21D 8/0436; C21D 8/0463; C21D 8/0473; C21D 1/19; C21D 1/26; C21D 2211/008; C21D 2211/005; C21D 2211/002 (86) International application number: PCT/IB2020/052999 (87) International publication number: WO 2020/229898 (19.11.2020 Gazette 2020/47)

(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: 15.05.2019 WO PCT/IB2019/054022 (71) Applicant: ArcelorMittal 1160 Luxembourg (LU)	(72) Inventors: SIEBENTRITT, Matthieu 57000 Metz (FR) LHOIST, Vincent 4257 Berloz (BE) (74) Representative: Plaisant, Sophie Marie  ArcelorMittal France Research & Development Intellectual Property 6, rue André Campra 93200 Saint-Denis 93200 Saint-Denis (FR)