EP 2554699 B1 20160810 - STEEL SHEET WITH HIGH TENSILE STRENGTH AND SUPERIOR DUCTILITY AND METHOD FOR PRODUCING SAME
Title (en)
STEEL SHEET WITH HIGH TENSILE STRENGTH AND SUPERIOR DUCTILITY AND METHOD FOR PRODUCING SAME
Title (de)
STAHLBLECH VON HOHER ZUGFESTIGKEIT UND HERVORRAGENDER DEHNBARKEIT SOWIE VERFAHREN ZU SEINER HERSTELLUNG
Title (fr)
TÔLE D'ACIER PRÉSENTANT UNE RÉSISTANCE À LA TRACTION ÉLEVÉE ET UNE MEILLEURE DUCTILITÉ ET PROCÉDÉ DE FABRICATION DE CETTE DERNIÈRE
Publication
Application
Priority
- JP 2010077305 A 20100330
- JP 2011055007 W 20110225
Abstract (en)
[origin: EP2554699A1] The invention provides a high strength steel sheet having excellent ductility which can avoid sudden breakage when being press-formed and has TS of 700 to 900 MPa, and a method for manufacturing such steel sheets. The high strength steel sheet having excellent ductility has a chemical composition represented by, in terms of % by mass, C: 0.5 to 1.5%, Si: not more than 0.1%, Mn: 10 to 25%, P: not more than 0.1%, S: not more than 0.05%, Al: not more that 0.1%, Ni: 3.0 to 8.0%, Mo: not more than 0.1%, N: not more than 0.01%, and Fe and inevitable impurities: balance, and has a microstructure formed of recrystallized austenite grains with an average grain diameter of 5 to 30 µm or further has another microstructure at an area ratio of not more than 1%.
IPC 8 full level
C22C 38/00 (2006.01); B21B 3/00 (2006.01); C21D 9/46 (2006.01); C22C 38/12 (2006.01)
CPC (source: EP KR)
C21D 8/0226 (2013.01 - KR); C21D 9/46 (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 38/08 (2013.01 - EP KR); C22C 38/12 (2013.01 - EP KR); C21D 2211/001 (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
DOCDB simple family (publication)
EP 2554699 A1 20130206; EP 2554699 A4 20150708; EP 2554699 B1 20160810; CN 102822371 A 20121212; CN 102822371 B 20150520; JP 2011208226 A 20111020; JP 5003785 B2 20120815; KR 101287331 B1 20130723; KR 20120113789 A 20121015; WO 2011122237 A1 20111006
DOCDB simple family (application)
EP 11762477 A 20110225; CN 201180016733 A 20110225; JP 2010077305 A 20100330; JP 2011055007 W 20110225; KR 20127021879 A 20110225