EP 4332253 A1 20240306 - HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Title (en)
HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Title (de)
HOCHFESTES STAHLBLECH UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER À HAUTE RÉSISTANCE, ET PROCÉDÉ DE FABRICATION DE CELLE-CI
Publication
Application
Priority
- JP 2021098034 A 20210611
- JP 2022020892 W 20220519
Abstract (en)
Objects are to provide a high strength steel sheet having a TS of 1320 MPa or more and a YR of 85% or more and having a wide range of appropriate clearances not leading to delayed fracture; and to provide a method for manufacturing the same.A high strength steel sheet includes a specific microstructure having a specific chemical composition and satisfying the formulas (1) and (2) defined below: KAMS/KAMC<1.00 wherein KAM (S) is a KAM (Kernel average misorientation) value of a superficial portion of the steel sheet, and KAM (C) is a KAM value of a central portion of the steel sheet, HvQ−HvS≥8 wherein Hv (Q) indicates the hardness of a portion at 1/4 sheet thickness and Hv (S) indicates the hardness of a superficial portion of the steel sheet.
IPC 8 full level
C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR)
C21D 1/25 (2013.01 - EP); C21D 1/78 (2013.01 - EP); C21D 7/10 (2013.01 - EP); C21D 8/0205 (2013.01 - EP KR); C21D 8/0226 (2013.01 - KR); C21D 8/0236 (2013.01 - KR); C21D 8/0242 (2013.01 - EP); C21D 8/0247 (2013.01 - EP); C21D 8/0273 (2013.01 - EP); C21D 9/46 (2013.01 - EP KR); C22C 38/001 (2013.01 - KR); C22C 38/002 (2013.01 - EP); C22C 38/005 (2013.01 - EP); C22C 38/008 (2013.01 - EP); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP KR); C22C 38/08 (2013.01 - EP); C22C 38/10 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C22C 38/14 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/34 (2013.01 - EP); C22C 38/38 (2013.01 - EP); C22C 38/58 (2013.01 - KR); C22C 38/60 (2013.01 - EP); C23C 2/06 (2013.01 - KR); C25D 3/22 (2013.01 - KR); C21D 2201/05 (2013.01 - EP); C21D 2211/001 (2013.01 - EP KR); C21D 2211/005 (2013.01 - KR); C21D 2211/008 (2013.01 - EP KR)
Designated contracting state (EPC)
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 state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4332253 A1 20240306; CN 117413084 A 20240116; JP 7215647 B1 20230131; JP WO2022259837 A1 20221215; KR 20240005883 A 20240112; MX 2023014591 A 20231215; WO 2022259837 A1 20221215
DOCDB simple family (application)
EP 22820019 A 20220519; CN 202280039296 A 20220519; JP 2022020892 W 20220519; JP 2022551345 A 20220519; KR 20237042125 A 20220519; MX 2023014591 A 20220519