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(11)

EP 4 100 552 A1

(12)

(43) Date of publication: 14.12.2022 Bulletin 2022/50 (21) Application number: 21750872.0 (22) Date of filing: 03.02.2021

(51) International Patent Classification (IPC):  C21D 6/00(2006.01) C21D 6/04(2006.01) C21D 6/02(2006.01) (52) Cooperative Patent Classification (CPC): C21D 8/0263; C21D 8/0463; C21D 9/46; C21D 9/48; C21D 1/26; C21D 8/0226; C21D 8/0426; C21D 6/005; C21D 6/004; C21D 6/002; C21D 6/008; C22C 38/04; C22C 38/02 (86) International application number: PCT/US2021/070117 (87) International publication number: WO 2021/159142 (12.08.2021 Gazette 2021/32)

(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: 03.02.2020 US 202062969262 P 30.03.2020 US 202063001591 P (71) Applicant: United States Steel Corporation Pittsburgh, PA 15219 (US)

(72) Inventors: BRANAGAN, Daniel James Idaho Falls, Idaho 83406 (US) JUSTICE, Grant G. Idaho Falls, Idaho 83402 (US) CLARK, Kurtis R. Idaho Falls, Idaho 83404 (US) LARISH, Scott T. Idaho Falls, Idaho 83406 (US) SERGUEEVA, Alla V. Idaho Falls, Idaho 83404 (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)