EP 3730655 A4 20201028 - HIGH STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Title (en)
HIGH STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Title (de)
HOCHFESTE STAHLPLATTE UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER À HAUTE RÉSISTANCE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- KR 20170178924 A 20171224
- KR 2018014855 W 20181128
Abstract (en)
[origin: EP3730655A1] A high strength steel sheet according to an aspect of the present invention comprises, by weight %, 0.05-0.20% of C, 0.15-0.55% of Si, 0.9-1.75% of Mn, 0.001-0.05% of Al, 0.03 % or less of P, 0.03% or less of S, 0.05-0.3% of Cr, 0.05-0.6% of Ni, 0.005-0.35% of Cu, 0.05-0.2% of Mo, 0.005-0.07% of V, 0.005-0.04% of Nb, 0.0005-0.005% of Ca, 0.005-0.025% of Ti, 0.002-0.006% of N, less than 0.0005% of B, the balance of Fe and inevitable impurities, with the proviso of satisfying the relation that Cu + Ni + Cr + Mo: 1.5% or less; Cr + Mo: 0.4% or less; V + Nb: 0.1% or less; and Ca/S: 1.0 or higher and may include a combined structure of tempered martensite and tempered bainite as a microstructure.
IPC 8 full level
C22C 38/42 (2006.01); C21D 1/18 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (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 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01)
CPC (source: EP KR US)
C21D 1/18 (2013.01 - EP KR); C21D 6/004 (2013.01 - US); C21D 6/005 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 8/0205 (2013.01 - US); C21D 8/0226 (2013.01 - EP); C21D 8/0247 (2013.01 - KR); C21D 8/0263 (2013.01 - EP US); C21D 9/46 (2013.01 - EP KR US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - KR US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP US); C22C 38/42 (2013.01 - EP KR US); C22C 38/44 (2013.01 - EP KR US); C22C 38/46 (2013.01 - EP KR US); C22C 38/48 (2013.01 - EP KR US); C22C 38/50 (2013.01 - EP KR US); C22C 38/58 (2013.01 - US); C21D 2211/002 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - EP KR US)
Citation (search report)
- [I] WO 2010074473 A2 20100701 - POSCO [KR], et al
- [I] JP 2015124435 A 20150706 - JFE STEEL CORP, et al
- [A] KR 100833069 B1 20080527 - POSCO [KR]
- [A] JP 2014218707 A 20141120 - JFE STEEL CORP
- See references of WO 2019124793A1
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 3730655 A1 20201028; EP 3730655 A4 20201028; EP 3730655 B1 20220518; CN 111566249 A 20200821; CN 111566249 B 20220513; JP 2021508774 A 20210311; JP 7096337 B2 20220705; KR 102031450 B1 20191011; KR 20190077177 A 20190703; US 2020347478 A1 20201105; WO 2019124793 A1 20190627
DOCDB simple family (application)
EP 18891912 A 20181128; CN 201880082338 A 20181128; JP 2020535011 A 20181128; KR 20170178924 A 20171224; KR 2018014855 W 20181128; US 201816957021 A 20181128