EP 2017363 A3 20090805 - High strength cold-rolled steel sheet and method for manufacturing the same
Title (en)
High strength cold-rolled steel sheet and method for manufacturing the same
Title (de)
Hochfestes kaltgewalztes Stahlblech und Herstellungsverfahren dafür
Title (fr)
Plaque d'acier laminé à froid haute résistance et son procédé de fabrication
Publication
Application
Priority
- EP 03736017 A 20030604
- JP 2002173668 A 20020614
- JP 2002173669 A 20020614
Abstract (en)
[origin: EP1514951A1] The present invention provides a high strength cold-rolled steel sheet, consisting essentially of, by mass%, 0.04 to 0.10% C, 0.5 to 1.5% Si, 1.8 to 3% Mn, 0.02% or less P, 0.01% or less S, 0.01 to 0.1% Sol. Al, 0.005% or less N, and the balance being iron and inevitable impurities, and having a structure which substantially comprises ferrite phase and martensite phase. Since the high strength cold-rolled steel sheet of the invention has ductility in which an elongation is 18% or more, excellent stretch-flangeability in which a hole-expanding ratio is 60% or more and a tensile strength of 780 MPa or more, it is favorable for use in a structural member of automobile.
IPC 8 full level
C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C21D 8/02 (2006.01)
CPC (source: EP US)
C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C21D 8/0236 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [E] EP 1512762 A1 20050309 - JFE STEEL CORP [JP]
- [A] JP H10147838 A 19980602 - KOBE STEEL LTD
- [A] EP 1201780 A1 20020502 - NIPPON STEEL CORP [JP]
- [A] JP H04333524 A 19921120 - NIPPON STEEL CORP
- [A] JP 2002161336 A 20020604 - NIPPON KOKAN KK
Designated contracting state (EPC)
DE SE
DOCDB simple family (publication)
EP 1514951 A1 20050316; EP 1514951 A4 20060510; EP 1514951 B1 20101124; DE 60335106 D1 20110105; EP 2017363 A2 20090121; EP 2017363 A3 20090805; US 2004238082 A1 20041202; WO 03106723 A1 20031224
DOCDB simple family (application)
EP 03736017 A 20030604; DE 60335106 T 20030604; EP 08159197 A 20030604; JP 0307062 W 20030604; US 48578004 A 20040329