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EP 4 341 453 A1

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(43) Date of publication: 27.03.2024 Bulletin 2024/13 (21) Application number: 22727753.0 (22) Date of filing: 28.04.2022

(51) International Patent Classification (IPC):  C21D 1/26(2006.01) C21D 8/06(2006.01) C22C 38/00(2006.01) C22C 38/06(2006.01) C22C 38/44(2006.01) B21C 1/00(2006.01) B21F 1/02(2006.01) C21D 6/00(2006.01) C21D 9/52(2006.01) C22C 38/04(2006.01) C22C 38/18(2006.01) C22C 38/58(2006.01) B21C 19/00(2006.01) D01G 15/84(2006.01) (52) Cooperative Patent Classification (CPC): C21D 8/065; C21D 9/525; C21D 2211/001; C21D 2211/004; C21D 2211/005; C21D 2211/008; C21D 6/002; C21D 6/004; C21D 6/005; C21D 1/26; C22C 38/44; C22C 38/58; C22C 38/001; C22C 38/06; C22C 38/04; C22C 38/18; B21C 1/003; B21C 19/00; B21G 1/00; D01G 15/88 (86) International application number: PCT/EP2022/061298 (87) International publication number: WO 2022/243000 (24.11.2022 Gazette 2022/47)

(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: 21.05.2021 WO PCT/CN2021/095293 (71) Applicant: NV Bekaert SA 8550 Zwevegem (BE)	(72) Inventors: LIU, Xiaojiang Jiangyin, Jiangsu 214429 (CN) SHEN, Li Jiangyin, Jiangsu 214429 (CN) ZHANG, Yanli Jiangyin, Jiangsu 214429 (CN) (74) Representative: Serwas, Harry  NV Bekaert SA IPD - PC6030 Bekaertstraat 2 8550 Zwevegem 8550 Zwevegem (BE)