EP 2796584 A4 20151014 - HIGH-STRENGTH STEEL SHEET AND PROCESS FOR PRODUCING SAME
Title (en)
HIGH-STRENGTH STEEL SHEET AND PROCESS FOR PRODUCING SAME
Title (de)
HOCHFESTES STAHLBLECH UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
FEUILLE D'ACIER À HAUTE RÉSISTANCE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2011276997 A 20111219
- JP 2012007663 W 20121129
Abstract (en)
[origin: EP2796584A1] Provided are a high-strength steel sheet, excellent in formability, having a TS of 600 MPa to 700 MPa, an El of 25% or more, and a » of 80% or more and a method for producing the same. A high-strength steel sheet has a composition containing 0.10% to 0.18% C, more than 0.5% to 1.5% Si, 0.5% to 1.5% Mn, 0.05% or less P, 0.005% or less S, and 0.05% or less Al on a mass basis, the remainder being Fe and inevitable impurities and also has a microstructure containing ferrite and pearlite. The volume fraction of the ferrite is 70% to 97%. The volume fraction of the pearlite is 3% or more. The volume fraction of cementite present at grain boundaries of the ferrite is 2% or less. The sum of the volume fractions of phases other than the ferrite, the pearlite, and the cementite is less than 3%. The average grain size of the ferrite is 7 µm or less.
IPC 8 full level
C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/28 (2006.01); C21D 8/04 (2006.01)
CPC (source: EP US)
C21D 8/0226 (2013.01 - EP US); C21D 8/0263 (2013.01 - EP US); C21D 8/0426 (2013.01 - EP US); C21D 8/0463 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/00 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/18 (2013.01 - EP US); C21D 1/26 (2013.01 - US); C21D 2211/005 (2013.01 - EP US); C21D 2211/009 (2013.01 - EP US)
Citation (search report)
- [XA] EP 1001041 A1 20000517 - KAWASAKI STEEL CO [JP]
- See references of WO 2013094130A1
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 2796584 A1 20141029; EP 2796584 A4 20151014; EP 2796584 B1 20180307; CN 104011240 A 20140827; CN 104011240 B 20161123; IN 1170KON2014 A 20151016; JP 2013127099 A 20130627; JP 5316634 B2 20131016; KR 101624439 B1 20160525; KR 20140100994 A 20140818; US 2014332123 A1 20141113; WO 2013094130 A1 20130627
DOCDB simple family (application)
EP 12860717 A 20121129; CN 201280063029 A 20121129; IN 1170KON2014 A 20140530; JP 2011276997 A 20111219; JP 2012007663 W 20121129; KR 20147018870 A 20121129; US 201214363166 A 20121129