Global Patent Index - EP 1514951 A4

EP 1514951 A4 20060510 - HIGH STRENGTH COLD ROLLED STEEL PLATE AND METHOD FOR PRODUCTION THEREOF

Title (en)

HIGH STRENGTH COLD ROLLED STEEL PLATE AND METHOD FOR PRODUCTION THEREOF

Title (de)

HOCHFESTE KALTGEWALZTE STAHLPLATTE UND HERSTELLUNGSVERFAHREN DAFÜR

Title (fr)

TOLE D'ACIER LAMINE A FROID A HAUTE RESISTANCE ET PROCEDE DE FABRICATION

Publication

EP 1514951 A4 20060510 (EN)

Application

EP 03736017 A 20030604

Priority

  • JP 0307062 W 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 1-7

C22C 38/00; C22C 38/06; C22C 38/38; C21D 9/46

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)

  • [X] EP 1201780 A1 20020502 - NIPPON STEEL CORP [JP]
  • [X] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 11 30 September 1998 (1998-09-30)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 017, no. 176 (C - 1045) 6 April 1993 (1993-04-06)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 2002, no. 10 10 October 2002 (2002-10-10)
  • See references of WO 03106723A1

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