(19)

(11)

EP 4 018 005 A1

(12)

(43) Date of publication: 29.06.2022 Bulletin 2022/26 (21) Application number: 20764876.7 (22) Date of filing: 18.08.2020

(51) International Patent Classification (IPC):  C21D 1/19(2006.01) C21D 1/28(2006.01) C21D 8/02(2006.01) C21D 9/46(2006.01) C22C 38/02(2006.01) C22C 38/06(2006.01) C22C 38/14(2006.01) C23C 2/40(2006.01) C25D 7/06(2006.01) C21D 1/26(2006.01) C21D 6/00(2006.01) C21D 8/04(2006.01) C21D 9/48(2006.01) C22C 38/04(2006.01) C22C 38/12(2006.01) C23C 2/00(2006.01) C25D 3/00(2006.01) C21D 1/25(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/02; C22C 38/04; C22C 38/06; C22C 38/12; C22C 38/14; C21D 2211/001; C21D 2211/005; C21D 9/46; C21D 9/48; C21D 8/0463; C21D 8/0263; C21D 8/0226; C21D 8/0426; C21D 6/005; C21D 6/008; C21D 1/19; C21D 1/26; C21D 1/28; C23C 2/40; C21D 1/25; C23C 2/02; C23C 2/06; C23C 2/28; C25D 7/0614; C25D 5/36 (86) International application number: PCT/US2020/046847 (87) International publication number: WO 2021/034851 (25.02.2021 Gazette 2021/08)

(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: 19.08.2019 US 201916544127 (71) Applicant: United States Steel Corporation Pittsburgh, PA 15219 (US)	(72) Inventors: HOYDICK, David Paul Pittsburgh, Pennsylvania 15227 (US) SILVA, Eduardo Augusto Pittsburgh, Pennsylvania 15668 (US) MCCOSBY, Matthew Michael Pittsburgh, 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)