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EP 3 891 346 A1

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(43) Date of publication: 13.10.2021 Bulletin 2021/41 (21) Application number: 19816927.8 (22) Date of filing: 03.12.2019

(51) International Patent Classification (IPC):  E04C 2/292(2006.01) E04B 7/22(2006.01) E04B 1/24(2006.01) E04B 1/61(2006.01) E04F 13/08(2006.01) (52) Cooperative Patent Classification (CPC): E04F 13/0878; E04C 2/292; E04F 13/0894 (86) International application number: PCT/IB2019/060402 (87) International publication number: WO 2020/115657 (11.06.2020 Gazette 2020/24)

(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: 04.12.2018 WO PCT/IB2018/059618 (71) Applicant: ArcelorMittal 1160 Luxembourg (LU)	(72) Inventors: GRASS, Jean-Claude 67150 Erstein (FR) HUET, Valérie 4400 Flemalle (BE) PLATEL, Alain 55000 Chardogne (FR) (74) Representative: Plaisant, Sophie Marie  ArcelorMittal France Research & Development Intellectual Property Immeuble Le Cézanne 6, rue André Campra 93212 La Plaine Saint-Denis 93212 La Plaine Saint-Denis (FR)