EP 4095272 A4 20230726 - STEEL SHEET AND METHOD FOR PRODUCING SAME
Title (en)
STEEL SHEET AND METHOD FOR PRODUCING SAME
Title (de)
STAHLBLECH UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
TÔLE D'ACIER ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- JP 2020008125 A 20200122
- JP 2021001658 W 20210119
Abstract (en)
[origin: EP4095272A1] There is provided a steel sheet including a chemical composition consisting of, in mass%: C: 0.14 to 0.60%, Si + Al ≤ 3.00, P ≤ 0.030%, S ≤ 0.0050%, N ≤ 0.015%, B ≤ 0.0050%, C × Mn ≤ 0.80, Mn + Ni + Cu + 1.3Cr + 4(Mo + W) ≥ 0.80, 0.003 ≤ Ti + Zr + Hf + V + Nb + Ta + Sc + Y ≤ 0.20, Sn + As + Sb + Bi ≤ 0.020, Mg: 0 to 0.005%, Ca: 0 to 0.005%, REM: 0 to 0.005%, with the balance: Fe and impurities, and satisfying Ms = 546 × exp(-1.362 × C) - 11 × Si - 30 × Mn - 18 × Ni - 20 × Cu - 12 × Cr - 8(Mo + W) ≥ 200, wherein a steel micro-structure includes, in volume%: martensite ≥ 85%, retained austenite ≤ 15%, and the balance: bainite, an average block size of martensite and bainite ≤ 3.0 µm, an average axial ratio of martensite and bainite: 1.0004 to 1.0100, and a yield stress is 1000 MPa or more.
IPC 8 full level
C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
C21D 1/25 (2013.01 - EP); C21D 8/0205 (2013.01 - EP); C21D 8/0226 (2013.01 - EP KR US); C21D 8/0236 (2013.01 - KR US); C21D 8/0263 (2013.01 - EP US); C21D 8/0273 (2013.01 - KR US); C21D 9/46 (2013.01 - EP KR US); C22C 38/001 (2013.01 - KR US); 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 US); 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 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/26 (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 - EP KR); C22C 38/44 (2013.01 - EP KR); C22C 38/48 (2013.01 - EP); C22C 38/50 (2013.01 - EP); C22C 38/54 (2013.01 - EP); C22C 38/58 (2013.01 - EP KR); C22C 38/60 (2013.01 - EP); C23C 2/40 (2013.01 - US); C21D 2211/001 (2013.01 - KR US); C21D 2211/002 (2013.01 - EP KR US); C21D 2211/004 (2013.01 - EP); C21D 2211/008 (2013.01 - EP KR US)
Citation (search report)
- [I] WO 2016177420 A1 20161110 - THYSSENKRUPP STEEL EUROPE AG [DE], et al
- [I] WO 2018108653 A1 20180621 - THYSSENKRUPP STEEL EUROPE AG [DE], et al
- [I] JP 2016050343 A 20160411 - NIPPON STEEL & SUMITOMO METAL CORP
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 4095272 A1 20221130; EP 4095272 A4 20230726; CN 115003839 A 20220902; JP 7364942 B2 20231019; JP WO2021149676 A1 20210729; KR 20220127894 A 20220920; MX 2022008976 A 20220811; US 2023065607 A1 20230302; WO 2021149676 A1 20210729
DOCDB simple family (application)
EP 21745006 A 20210119; CN 202180010399 A 20210119; JP 2021001658 W 20210119; JP 2021572738 A 20210119; KR 20227028020 A 20210119; MX 2022008976 A 20210119; US 202117794442 A 20210119