(19)
(11) EP 4 565 722 A1

(12)

(43) Date of publication:
11.06.2025 Bulletin 2025/24

(21) Application number: 23754871.4

(22) Date of filing: 01.08.2023
(51) International Patent Classification (IPC): 
C21D 9/00(2006.01)
C21D 1/673(2006.01)
C21D 8/02(2006.01)
B32B 15/01(2006.01)
C23C 2/26(2006.01)
C23C 10/00(2006.01)
C22C 21/10(2006.01)
C22C 21/06(2006.01)
C22C 38/18(2006.01)
C22C 38/32(2006.01)
 C21D 9/46(2006.01)
C21D 8/00(2006.01)
C21D 8/04(2006.01)
C23C 2/12(2006.01)
C23C 2/28(2006.01)
C23C 8/10(2006.01)
C22C 21/02(2006.01)
C22C 21/00(2006.01)
C22C 38/28(2006.01)
C22C 38/02(2006.01)
(52) Cooperative Patent Classification (CPC):
C21D 9/0068; C21D 9/46; C21D 2211/005; C21D 2211/008; C21D 2211/002; C21D 2261/00; C21D 1/673; C21D 8/005; C21D 8/0236; C21D 8/0278; C21D 8/0436; C21D 8/0478; B32B 15/012; C23C 2/12; C23C 2/26; C23C 2/28; C23C 8/10; B21D 22/022; C22C 21/10; C22C 21/02; C22C 21/06; C22C 21/00; C22C 38/18; C22C 38/28; C22C 38/32; C22C 38/02; C22C 38/04; C22C 38/06; C23C 28/345; C23C 28/322; B21D 35/006
(86) International application number:
PCT/IB2023/057782
(87) International publication number:
WO 2024/028763 (08.02.2024 Gazette 2024/06)
(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
KH MA MD TN

(30) Priority: 04.08.2022 WO PCT/IB2022/057248

(71) Applicant: ArcelorMittal
1160 Luxembourg (LU)

(72) Inventors:
  • GRIGORIEVA, Raisa
    57000 Metz (FR)
  • BROSSARD, Maxime
    57530 Ars-Laquenexy (FR)
  • MACHADO AMORIM, Tiago
    57050 Longeville Les Metz (FR)

(74) Representative: Plaisant, Sophie Marie 
ArcelorMittal France Research & Development Intellectual Property 6, rue André Campra
93200 Saint-Denis
93200 Saint-Denis (FR)

   


(54) STEEL SHEET WITH VARIABLE THICKNESS HAVING A REDUCED RISK OF DELAYED FRACTURE AFTER PRESS HARDENING AND METHOD FOR MANUFACTURING THE SAME