Global Patent Index - EP 2048254 B1

EP 2048254 B1 20200819 - HIGH STRENGTH STEEL PLATE SUPERIOR IN STRETCH FLANGE FORMABILITY AND FATIGUE CHARACTERISTICS

Title (en)

HIGH STRENGTH STEEL PLATE SUPERIOR IN STRETCH FLANGE FORMABILITY AND FATIGUE CHARACTERISTICS

Title (de)

HOCHFESTE STAHLPLATTE MIT HERVORRAGENDEN STRETCHFLANSCHVERFORMBARKEITS- UND ERMÜDUNGSEIGENSCHAFTEN

Title (fr)

TOLE D'ACIER À HAUTE RÉSISTANCE SUPÉRIEURE DANS LA FORMABILITÉ DES BORDS D'ÉTIRAGE ET LES CARASTÉRISTIQUES DE FATIGUE

Publication

EP 2048254 B1 20200819 (EN)

Application

EP 07738099 A 20070302

Priority

  • JP 2007054614 W 20070302
  • JP 2006193893 A 20060714

Abstract (en)

[origin: EP2048254A1] The present invention provides high strength hot rolled steel plate superior in stretch flange formability and fatigue characteristics comprising steel plate containing C: 0.03 to 0.20%, Si: 0.08 to 1.5%, Mn: 1.0 to 3.0%, P: 0.05% or less, S: 0.0005% or more, N: 0.0005 to 0.01%, acid soluble A1: 0.01% or less, acid soluble Ti: less than 0.008%, and a total of one or both of Ce or La: 0.0005 to 0.04%, having a balance of iron and unavoidable impurities and having a number ratio of 20% or less of stretched inclusions present in the steel plate having a circle equivalent diameter of 1 µm or more and a long axis/short axis of 5 or more.

IPC 8 full level

C22C 38/00 (2006.01); C21D 9/46 (2006.01); C22C 38/14 (2006.01); C22C 38/38 (2006.01)

CPC (source: EP KR US)

C21D 8/0426 (2013.01 - EP KR US); C21D 9/46 (2013.01 - EP KR US); C21D 9/48 (2013.01 - EP KR US); C22C 38/001 (2013.01 - KR); C22C 38/005 (2013.01 - EP KR US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C21D 2211/002 (2013.01 - EP KR US)

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

EP 2048254 A1 20090415; EP 2048254 A4 20121107; EP 2048254 B1 20200819; AU 2007273767 A1 20080117; AU 2007273767 B2 20100812; CA 2657587 A1 20080117; CA 2657587 C 20131126; CN 101490295 A 20090722; CN 101490295 B 20120919; KR 20090018167 A 20090219; TW 200804607 A 20080116; TW I424069 B 20140121; US 2009317285 A1 20091224; WO 2008007477 A1 20080117

DOCDB simple family (application)

EP 07738099 A 20070302; AU 2007273767 A 20070302; CA 2657587 A 20070302; CN 200780026824 A 20070302; JP 2007054614 W 20070302; KR 20087031704 A 20081229; TW 96107646 A 20070306; US 37357007 A 20070302