Global Patent Index - EP 1731626 A1

EP 1731626 A1 20061213 - HIGH-RIGIDITY HIGH-STRENGTH THIN STEEL SHEET AND METHOD FOR PRODUCING SAME

Title (en)

HIGH-RIGIDITY HIGH-STRENGTH THIN STEEL SHEET AND METHOD FOR PRODUCING SAME

Title (de)

HOCHSTEIFES HOCHFESTES DÜNNES STAHLBLECH UND HERSTELLUNGSVERFAHREN DAFÜR

Title (fr)

FEUILLE MINCE D'ACIER A HAUTE RIGIDITE ET HAUTE RESISTANCE ET PROCEDE DE FABRICATION DE LADITE FEUILLE

Publication

EP 1731626 A1 20061213 (EN)

Application

EP 05727349 A 20050331

Priority

  • JP 2005006288 W 20050331
  • JP 2004106721 A 20040331
  • JP 2004347025 A 20041130

Abstract (en)

There is provided a high-stiffness high-strength thin steel sheet having a tensile strength of not less than 590 MPa and a Young's modulus of not less than 225 GPa, which comprises C: 0.02-0.15%, Si: not more than 1.5%, Mn: 1.5-4.0%, P: not more than 0.05%, S: not more than 0.01%, Al: not more than 1.5%, N: not more than 0.01% and Nb: 0.02-0.40% as mass%, provided that C, N and Nb contents satisfy 0.01 ‰¤C+(12/14)×N-(12/92.9)×Nb ‰¤ 0.06 and N ‰¤ (14/92.9)×(Nb-0.01) and the remainder being substantially iron and inevitable impurities, and has a texture comprising a ferrite phase as a main phase and having a martensite phase at an area ratio of not less than 1%.

IPC 8 full level

C22C 38/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/48 (2006.01); C22C 38/58 (2006.01)

CPC (source: EP KR US)

C21D 8/0205 (2013.01 - EP KR US); C21D 9/46 (2013.01 - EP KR US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/12 (2013.01 - KR); C22C 38/14 (2013.01 - KR); C21D 2211/005 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - EP KR US)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 1731626 A1 20061213; EP 1731626 A4 20071031; EP 1731626 B1 20170719; AU 2005227556 A1 20051013; AU 2005227556 B2 20080214; CA 2546003 A1 20051013; KR 100881048 B1 20090130; KR 20060134030 A 20061227; TW 200604347 A 20060201; TW I307721 B 20090321; US 2008118390 A1 20080522; WO 2005095663 A1 20051013

DOCDB simple family (application)

EP 05727349 A 20050331; AU 2005227556 A 20050331; CA 2546003 A 20050331; JP 2005006288 W 20050331; KR 20067014873 A 20060724; TW 94110204 A 20050331; US 57852506 A 20060508