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(11)

EP 4 305 217 A1

(12)

(43) Date of publication: 17.01.2024 Bulletin 2024/03 (21) Application number: 22714151.2 (22) Date of filing: 10.03.2022

(51) International Patent Classification (IPC):  C21D 8/02(2006.01) C22C 38/02(2006.01) C22C 38/06(2006.01) C22C 38/14(2006.01) C22C 38/18(2006.01) C21D 1/25(2006.01) C22C 38/00(2006.01) C22C 38/04(2006.01) C22C 38/12(2006.01) C22C 38/16(2006.01) C21D 1/22(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/001; C22C 38/02; C22C 38/04; C22C 38/06; C22C 38/12; C22C 38/14; C22C 38/16; C22C 38/18; C22C 38/005; C21D 8/0226; C21D 8/0236; C21D 8/0273; C21D 2211/002; C21D 2211/008; C21D 2211/001; C21D 2211/005; C21D 1/22; C21D 1/25 (86) International application number: PCT/EP2022/056280 (87) International publication number: WO 2022/189606 (15.09.2022 Gazette 2022/37)

(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: 11.03.2021 EP 21161972 (71) Applicant: Tata Steel Nederland Technology B.V. 1951 JZ Velsen-Noord (NL)	(72) Inventor: CHEN, Shangping 1870 CA IJmuiden (NL) (74) Representative: Group Intellectual Property Services  c/o Tata Steel Nederland Technology B.V. P.O. Box 10000 - 3G.37 1970 CA IJmuiden 1970 CA IJmuiden (NL)