EP 3480332 A1 20190508 - HIGH STRENGTH STEEL PLATE HAVING EXCELLENT LOW YIELD RATIO CHARACTERISTICS AND LOW TEMPERATURE TOUGHNESS AND METHOD FOR MANUFACTURING SAME
Title (en)
HIGH STRENGTH STEEL PLATE HAVING EXCELLENT LOW YIELD RATIO CHARACTERISTICS AND LOW TEMPERATURE TOUGHNESS AND METHOD FOR MANUFACTURING SAME
Title (de)
HOCHFESTE STAHLPLATTE MIT HERVORRAGENDEM NIEDRIGEM STRECKGRENZENVERHÄLTNIS UND KÄLTEZÄHIGKEIT UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
PLAQUE D'ACIER À HAUTE RÉSISTANCE PRÉSENTANT D'EXCELLENTES CARACTÉRISTIQUES DE FAIBLE COEFFICIENT D'ÉLASTICITÉ ET UNE TÉNACITÉ À BASSE TEMPÉRATURE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- KR 20160083588 A 20160701
- KR 2017006956 W 20170630
Abstract (en)
One aspect of the present invention relates to a high strength steel plate having excellent low yield ratio characteristics and low temperature toughness, comprising, by weight %: C: 0.03 to 0.08%; Si: 0.05 to 0.3%; Mn: 1.0 to 2.0%; Al: 0.005 to 0.04%; Nb: 0.005 to 0.04%; Ti: 0.001 to 0.02%; Cu: 0.05 to 0.4%; Ni: 0.6 to 2.0%; Mo: 0.08 to 0.3%; N: 0.002 to 0.006%; P: 0.01% or less; S: 0.003% or less; and the remainder being Fe and unavoidable impurities, in which a microstructure contains, by area fraction, 80 to 92% of ferrite, 8 to 20% of a martensite/austenite mixed structure (MA), wherein the MA has an average size measured as a circle-equivalent diameter of 3 µ m or less.
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/28 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01)
CPC (source: EP KR)
C21D 1/28 (2013.01 - KR); C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP KR); C21D 9/46 (2013.01 - EP); C22C 38/00 (2013.01 - KR); C22C 38/001 (2013.01 - KR); 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 KR); C22C 38/12 (2013.01 - EP KR); C22C 38/14 (2013.01 - EP KR); C22C 38/16 (2013.01 - EP KR); C21D 2211/001 (2013.01 - EP); C21D 2211/002 (2013.01 - EP); C21D 2211/005 (2013.01 - EP); C21D 2211/008 (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
DOCDB simple family (publication)
EP 3480332 A1 20190508; EP 3480332 A4 20190626; EP 3480332 B1 20211013; CN 109328240 A 20190212; CN 109328240 B 20220517; JP 2019524987 A 20190905; JP 6771047 B2 20201021; KR 101799202 B1 20171120; WO 2018004297 A1 20180104
DOCDB simple family (application)
EP 17820573 A 20170630; CN 201780039727 A 20170630; JP 2018566924 A 20170630; KR 20160083588 A 20160701; KR 2017006956 W 20170630