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(11)

EP 4 146 838 A1

(12)

(43) Date of publication: 15.03.2023 Bulletin 2023/11 (21) Application number: 21724278.3 (22) Date of filing: 06.05.2021

(51) International Patent Classification (IPC):  C22C 38/44(2006.01) C22C 38/04(2006.01) C22C 38/00(2006.01) C22C 38/52(2006.01) C21D 8/06(2006.01) E21B 17/00(2006.01) C22C 38/02(2006.01) C22C 38/06(2006.01) C22C 38/42(2006.01) C21D 9/22(2006.01) C21D 6/00(2006.01) (52) Cooperative Patent Classification (CPC): C22C 38/02; C22C 38/04; C22C 38/44; C22C 38/06; C22C 38/001; C22C 38/42; C22C 38/52; C22C 38/00; C21D 8/06; C21D 8/065; C21D 9/22; C21D 6/004; C21D 6/00 (86) International application number: PCT/EP2021/062067 (87) International publication number: WO 2021/224423 (11.11.2021 Gazette 2021/45)

(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: 06.05.2020 EP 20173354 (71) Applicant: Alleima Rock Drill Steel AB 811 81 Sandviken (SE)	(72) Inventors: HARALDSSON, Jan 811 81 SANDVIKEN (SE) NYLÖF, Lars 811 81 SANDVIKEN (SE) WESTHOLM, Sofia 16941 SOLNA (SE) (74) Representative: Setréus, Ellen  Alleima EMEA AB 811 81 Sandviken 811 81 Sandviken (SE)