EP 1731626 A4 20071031 - 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 HAUTE RIGIDITE HAUTE RESISTANCE ET PROCEDE DE FABRICATION DE LADITE FEUILLE

Publication

EP 1731626 A4 20071031 (EN)

Application

EP 05727349 A 20050331

Priority

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

Abstract (en)

[origin: EP1731626A1] 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)

Citation (search report)

[DX] JP H08311541 A 19961126 - SUMITOMO METAL IND
[A] JP H05263191 A 19931012
[A] JP 2003342680 A 20031203 - JFE STEEL KK
[A] JP H11343535 A 19991214 - KAWASAKI STEEL CO

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