EP 3889305 C0 20240410 - HIGH-STRENGTH STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE FRACTURE TOUGHNESS AND ELONGATION RATIO, AND MANUFACTURING METHOD THEREFOR
Title (en)
HIGH-STRENGTH STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE FRACTURE TOUGHNESS AND ELONGATION RATIO, AND MANUFACTURING METHOD THEREFOR
Title (de)
HOCHFESTE STAHLPLATTE MIT AUSGEZEICHNETER TIEFTEMPERATURBRUCHZÄHIGKEIT UND STRECKVERHÄLTNIS UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
PLAQUE D'ACIER À HAUTE RÉSISTANCE AYANT UN EXCELLENT RAPPORT DE TÉNACITÉ À LA RUPTURE ET D'ALLONGEMENT À BASSE TEMPÉRATURE ET PROCÉDÉ DE FABRICATION ASSOCIÉ
Publication
Application
Priority
- KR 20180151565 A 20181130
- KR 2019016785 W 20191129
Abstract (en)
[origin: EP3889305A1] A high-strength steel plate having excellent fracture toughness and elongation ratio according an aspect of the present invention comprises, by weight%, 0.05-0.1% of carbon (C), 0.05-0.5% of silicon (Si), 1.4-2.0% of manganese (Mn), 0.01-0.05% of aluminum (Al), 0.005-0.02% of titanium (Ti), 0.002-0.01% of nitrogen (N), 0.04-0.07% of niobium (Nb), 0.05-0.3% of chromium (Cr), 0.05-0.4% of nickel (Ni), 0.02% or less of phosphorus (P), 0.005% or less of sulfur (S), 0.0005-0.004% of calcium (Ca), and the remainder of iron (Fe) and unavoidable impurities, wherein a microstructure includes 20-60 area% of ferrite and bainite, and the grain size of the upper 80% of the high-angle grain sizes based on 15 degrees in the centre of the steel plate may be 70 µm or less.
IPC 8 full level
C22C 38/58 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01)
CPC (source: EP KR RU)
C21D 8/0226 (2013.01 - EP KR RU); C21D 8/0263 (2013.01 - EP KR); C22C 38/001 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP KR); C22C 38/44 (2013.01 - EP KR); C22C 38/48 (2013.01 - EP KR); C22C 38/50 (2013.01 - EP KR RU); C22C 38/58 (2013.01 - EP KR RU); C21D 2211/002 (2013.01 - EP KR); C21D 2211/005 (2013.01 - EP 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
Participating member state (EPC – UP)
AT BE BG DE DK EE FI FR IT LT LU LV MT NL PT SE SI
DOCDB simple family (publication)
EP 3889305 A1 20211006; EP 3889305 A4 20211006; EP 3889305 B1 20240410; EP 3889305 C0 20240410; CA 3120271 A1 20200604; CA 3120271 C 20230912; CN 113166904 A 20210723; CN 113166904 B 20231027; JP 2022510935 A 20220128; JP 7372325 B2 20231031; KR 102164107 B1 20201013; KR 20200066394 A 20200610; RU 2771151 C1 20220427; WO 2020111891 A1 20200604
DOCDB simple family (application)
EP 19889727 A 20191129; CA 3120271 A 20191129; CN 201980078794 A 20191129; JP 2021530865 A 20191129; KR 20180151565 A 20181130; KR 2019016785 W 20191129; RU 2021118464 A 20191129