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(11)

EP 3 966 355 A1

(12)

(43) Date of publication: 16.03.2022 Bulletin 2022/11 (21) Application number: 20728339.1 (22) Date of filing: 06.05.2020

(51) International Patent Classification (IPC):  C21D 8/02(2006.01) C21D 9/46(2006.01) C22C 38/04(2006.01) C23C 2/06(2006.01) B22D 11/00(2006.01) C22C 38/02(2006.01) C22C 38/06(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/02; C22C 38/04; C22C 38/06; C21D 8/0205; C21D 8/0226; C21D 8/0263; C21D 9/46; C23C 2/06; C21D 2211/001; C21D 2211/005; C21D 2211/008; C23C 2/02; C23C 2/28; B22D 11/001 (86) International application number: PCT/US2020/031719 (87) International publication number: WO 2020/227438 (12.11.2020 Gazette 2020/46)

(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: 07.05.2019 US 201962844301 P (71) Applicant: United States Steel Corporation Pittsburgh, PA 15219-2800 (US)	(72) Inventors: HOYDICK, David Paul Pittsburgh, Pennsylvania 15227 (US) SILVA, Eduardo Augusto Murrysville, Pennsylvania 15668 (US) MCCOSBY, Matthew Michael New Castle, Pennsylvania 16101 (US) (74) Representative: Richards, John  Ladas & Parry LLP Temple Chambers 3-7 Temple Avenue London EC4Y 0DA Temple Chambers 3-7 Temple Avenue London EC4Y 0DA (GB)