EP 4123046 B1 20240501 - STEEL SHEET
Title (en)
STEEL SHEET
Title (de)
STAHLBLECH
Title (fr)
TÔLE D'ACIER
Publication
Application
Priority
- JP 2020049120 A 20200319
- JP 2021009279 W 20210309
Abstract (en)
[origin: EP4123046A1] This steel sheet has a predetermined chemical composition, Ex. C that is obtained by Ex. C = (%C) - 12{ (%Ti*)/48 + (%V)/51 + (%Nb)/93 + (%Mo)/96 + (%W)/184} is 0.020% or less, a microstructure at a 1/4 depth position of a sheet thickness from a surface contains 60% or more of ferrite, 0% to 5% of MA and a total of 0% to 5% of pearlite and cementite with a remainder of bainite in terms of area fractions, in the microstructure, the average crystal grain diameter is 10.0 µm or less, the average aspect ratio of crystal grains is 0.30 or more, the standard deviation of a Mn concentration is 0.60 mass% or less, a Ti-based carbide having a Baker-Nutting orientation relationship in the ferrite is precipitated in a semi-coherent state, and a tensile strength is 980 MPa or more.
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C21D 1/02 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01)
CPC (source: EP KR US)
C21D 8/0226 (2013.01 - KR); C21D 9/46 (2013.01 - KR); C22C 38/002 (2013.01 - EP US); C22C 38/005 (2013.01 - EP); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - KR US); C22C 38/12 (2013.01 - EP); C22C 38/14 (2013.01 - EP); C22C 38/28 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/34 (2013.01 - KR); C22C 38/38 (2013.01 - EP); C22C 38/42 (2013.01 - KR US); C22C 38/44 (2013.01 - KR US); C22C 38/46 (2013.01 - KR US); C22C 38/48 (2013.01 - US); C22C 38/50 (2013.01 - US); C22C 38/54 (2013.01 - US); C22C 38/58 (2013.01 - KR); C23C 2/02 (2013.01 - EP); C23C 2/04 (2013.01 - US); C23C 2/06 (2013.01 - EP KR); C23C 2/28 (2013.01 - EP); C23C 2/40 (2013.01 - EP); C21D 1/02 (2013.01 - EP); C21D 8/0205 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C21D 2211/001 (2013.01 - EP); C21D 2211/002 (2013.01 - EP KR); C21D 2211/003 (2013.01 - KR); C21D 2211/004 (2013.01 - EP); C21D 2211/005 (2013.01 - EP KR); C21D 2211/009 (2013.01 - 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
DOCDB simple family (publication)
EP 4123046 A1 20230125; EP 4123046 A4 20230816; EP 4123046 B1 20240501; CN 115298342 A 20221104; CN 115298342 B 20231117; JP 7277860 B2 20230519; JP WO2021187238 A1 20210923; KR 20220138402 A 20221012; MX 2022011351 A 20221007; US 2023140358 A1 20230504; WO 2021187238 A1 20210923
DOCDB simple family (application)
EP 21772047 A 20210309; CN 202180020970 A 20210309; JP 2021009279 W 20210309; JP 2022508240 A 20210309; KR 20227031055 A 20210309; MX 2022011351 A 20210309; US 202117908581 A 20210309