EP 2022865 A1 20090211 - ULTRAHIGH STRENGTH STEEL SHEET AND STRENGTH PART FOR AUTOMOBILE UTILIZING THE SAME
Title (en)
ULTRAHIGH STRENGTH STEEL SHEET AND STRENGTH PART FOR AUTOMOBILE UTILIZING THE SAME
Title (de)
ULTRAHOCHFESTES STAHLBLECH UND FESTIGKEITSTEIL FÜR AUTO DAMIT
Title (fr)
TÔLE D'ACIER DE TRÈS HAUTE RÉSISTANCE ET PIÈCE DE RENFORT POUR AUTOMOBILE L'UTILISANT
Publication
Application
Priority
- JP 2007057424 W 20070403
- JP 2006137225 A 20060517
- JP 2006137226 A 20060517
- JP 2006137227 A 20060517
Abstract (en)
There is provided an ultrahigh strength steel sheet containing 0.10 to 0.40 mass% of C, 0.01 to 3.5 mass% of Cr, at least one selected from the group consisting of 0.10 to 2.0 mass% of Mo, 0.20 to 1.5 mass% of W, 0.002 to 1.0 mass% of V, 0.002 to 1.0 mass% of Ti and 0.005 to 1.0 mass% of Nb, 0.02 mass% or less of P and 0.01 mass% or less of S as impurities and the balance being Fe and unavoidable impurities based on the total mass of the steel sheet and having a base structure of lower bainite, a prior austenite grain size of 30 µm or smaller and a tensile strength of 980 MPa or higher. There is also provided an automotive strength part using the ultrahigh strength steel sheet.
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/28 (2006.01); C22C 38/50 (2006.01)
CPC (source: EP US)
C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US)
Citation (search report)
See references of WO 2007132600A1
Designated contracting state (EPC)
DE FR GB
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 2022865 A1 20090211; US 2009236015 A1 20090924; WO 2007132600 A1 20071122
DOCDB simple family (application)
EP 07740860 A 20070403; JP 2007057424 W 20070403; US 29940707 A 20070403