EP 2612945 B1 20140416 - HIGH-STRENGTH STEEL PLATE AND METHOD FOR PRODUCING SAME
Title (en)
HIGH-STRENGTH STEEL PLATE AND METHOD FOR PRODUCING SAME
Title (de)
HOCHFESTE STAHLPLATTE UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
PLAQUE D'UN ACIER À HAUTE RÉSISTANCE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2010248032 A 20101105
- JP 2011075286 W 20111102
Abstract (en)
[origin: EP2612945A1] A high-strength steel plate has a chemical composition containing, % by mass: C: 0.05% or more and less than 0.10%; Si: 0.20% or more and 0.50% or less; Mn: 0.20% or more and less than 1.20%; Cr: 0.20% or more and 1.20% or less; Mo: 0.20% or more and 0.60% or less; Nb: 0.010% or more and 0.050% or less; Ti: 0.005% or more and 0.030% or less; Al: 0.01% or more and 0.10% or less; B: 0.0003% or more and 0.0030% or less; V: 0% or more and 0.10% or less; Cu: 0% or more and 0.50% or less; and Ca: 0% or more and 0.0030% or less; and limited to: Ni: 0.1% or less; P: 0.012% or less; S: 0.005% or less; and N: 0.0080% or less; and a balance consisting of Fe and inevitable impurities, wherein Pcm is equal to or less than 0.22%, "A" is equal to or less than 2.0, the sum of a structural fraction of a lower bainite and a structural fraction of a martensite is equal to or more than 90%, the structural fraction of the lower bainite is equal to or more than 70%, an aspect ratio of a prior austenite grain is equal to or more than 2, a yield strength is equal to or more than 885 MPa, and a tensile strength is equal to or more than 950 MPa and equal to or less than 1130 MPa.
IPC 8 full level
C21D 8/02 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01)
CPC (source: EP KR)
C21D 8/02 (2013.01 - KR); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/26 (2013.01 - EP); C22C 38/28 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/42 (2013.01 - EP); C22C 38/44 (2013.01 - EP); C22C 38/46 (2013.01 - EP); C22C 38/48 (2013.01 - EP); C22C 38/50 (2013.01 - EP); C22C 38/54 (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 2612945 A1 20130710; EP 2612945 A4 20130724; EP 2612945 B1 20140416; BR 112013010765 A2 20180502; BR 112013010765 B1 20181218; CN 103189537 A 20130703; CN 103189537 B 20160120; JP 5037744 B2 20121003; JP WO2012060405 A1 20140512; KR 101374422 B1 20140317; KR 20130051518 A 20130520; TW 201226582 A 20120701; TW I418641 B 20131211; WO 2012060405 A1 20120510
DOCDB simple family (application)
EP 11838055 A 20111102; BR 112013010765 A 20111102; CN 201180052498 A 20111102; JP 2011075286 W 20111102; JP 2012514004 A 20111102; KR 20137011406 A 20111102; TW 100139995 A 20111102