EP 4306672 A1 20240117 - GALVANIZED STEEL SHEET AND MEMBER, AND METHOD FOR MANUFACTURING SAME
Title (en)
GALVANIZED STEEL SHEET AND MEMBER, AND METHOD FOR MANUFACTURING SAME
Title (de)
GALVANISIERTES STAHLBLECH UND ELEMENT SOWIE VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
TÔLE D'ACIER GALVANISÉ ET ÉLÉMENT ET PROCÉDÉ DE FABRICATION ASSOCIÉ
Publication
Application
Priority
- JP 2021049167 A 20210323
- JP 2022012855 W 20220318
Abstract (en)
Provided is a galvanized steel sheet having a TS of 980 MPa or more, high YS, excellent ductility, strain hardenability, and hole expansion formability. A base steel sheet has a defined chemical composition and a steel microstructure as follows: area ratio of ferrite: 65.0 % or less (including 0 %), area ratio of bainitic ferrite: 5.0 % or more and 40.0 % or less, area ratio of tempered martensite: 0.5 % or more and 80.0 % or less, area ratio of retained austenite: 3.0 % or more, area ratio of fresh martensite: 20.0 % or less (including 0 %), S<sub>BF</sub> + S<sub>TM</sub> + 2 × S<sub>MA</sub>: 65.0 % or more, S<sub>MA1</sub>/S<sub>MA</sub>: 0.80 or less, and S<sub>MA2</sub>/S<sub>MA</sub>: 0.20 or more.
IPC 8 full level
C22C 38/00 (2006.01); C21D 9/46 (2006.01); C22C 18/00 (2006.01); C22C 38/06 (2006.01); C22C 38/60 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01)
CPC (source: EP KR US)
C21D 1/19 (2013.01 - EP); C21D 1/26 (2013.01 - EP); C21D 1/76 (2013.01 - EP); C21D 3/04 (2013.01 - KR); C21D 8/0205 (2013.01 - EP); C21D 8/0226 (2013.01 - KR US); C21D 8/0236 (2013.01 - KR US); C21D 8/0247 (2013.01 - US); C21D 8/0273 (2013.01 - EP); C21D 9/46 (2013.01 - US); C22C 38/001 (2013.01 - KR US); C22C 38/002 (2013.01 - EP US); C22C 38/005 (2013.01 - EP); C22C 38/008 (2013.01 - EP); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP KR US); C22C 38/08 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C22C 38/14 (2013.01 - EP); C22C 38/16 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/34 (2013.01 - EP); C22C 38/38 (2013.01 - EP); C22C 38/42 (2013.01 - KR); C22C 38/44 (2013.01 - KR); C22C 38/46 (2013.01 - KR); C22C 38/48 (2013.01 - KR); C22C 38/50 (2013.01 - KR); C22C 38/58 (2013.01 - KR); C22C 38/60 (2013.01 - EP); C23C 2/02 (2013.01 - EP); C23C 2/04 (2013.01 - EP); C23C 2/06 (2013.01 - KR US); C23C 2/28 (2013.01 - EP); C23C 2/40 (2013.01 - EP US); C21D 2211/001 (2013.01 - US); C21D 2211/002 (2013.01 - US); C21D 2211/005 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - EP KR US); C22C 18/00 (2013.01 - EP)
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 4306672 A1 20240117; CN 117062928 A 20231114; JP 7197063 B1 20221227; JP WO2022202716 A1 20220929; KR 20230135631 A 20230925; MX 2023011170 A 20230929; US 2024124964 A1 20240418; WO 2022202716 A1 20220929
DOCDB simple family (application)
EP 22775503 A 20220318; CN 202280022963 A 20220318; JP 2022012855 W 20220318; JP 2022542316 A 20220318; KR 20237028572 A 20220318; MX 2023011170 A 20220318; US 202218546428 A 20220318