EP 2371978 B1 20180502 - STEEL SHEET AND SURFACE-TREATED STEEL SHEET
Title (en)
STEEL SHEET AND SURFACE-TREATED STEEL SHEET
Title (de)
STAHLBLECH UND OBERFLÄCHENBEHANDELTES STAHLBLECH
Title (fr)
FEUILLE D'ACIER ET FEUILLE D'ACIER TRAITÉE EN SURFACE
Publication
Application
Priority
- JP 2009069464 W 20091117
- JP 2008295897 A 20081119
- JP 2008295898 A 20081119
- JP 2008295899 A 20081119
- JP 2008295900 A 20081119
Abstract (en)
[origin: WO2010058762A1] A high-strength steel sheet having excellent bending strength in the form of a tensile strength of 590 MPa or higher has a chemical composition of C: 0.03 to 0.20%, Si: 0.005 to 2.0%, Mn: 1.2 to 3.5%, P=0.1% or less, S=0.11% or less, sol. Al: 0.001 to 1.0%, N=0.01%, and Bi: 0.0001 to 0.05%; arbitrarily contains Ti:=0.3%, Nb:=0.3%, V:=0.3%, Cr:=1%, Mo:=1%, Cu:=1%, Ni:=1%, Ca:=0.01%, Mg:=0.01%, REM:=0.01%, Zr:=0.01%, and B:=0.01%; and has an Mn segregation ratio (Mnmax/Mnav) of less than 1.30 as calculated from the average Mn concentration (Mnav) and the maximum Mn concentration (Mnmax) at a position of (1/20) the depth of sheet thickness from the steel sheet surface.
IPC 8 full level
C22C 38/00 (2006.01); B21B 3/00 (2006.01); B22D 11/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01)
CPC (source: EP KR)
C21D 8/0215 (2013.01 - EP KR); C21D 8/0226 (2013.01 - EP KR); C21D 8/0236 (2013.01 - EP KR); C21D 8/0273 (2013.01 - EP KR); C22C 38/002 (2013.01 - EP KR); C22C 38/005 (2013.01 - KR); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP KR)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
WO 2010058762 A1 20100527; CN 102282280 A 20111214; CN 102282280 B 20150107; EP 2371978 A1 20111005; EP 2371978 A4 20160504; EP 2371978 B1 20180502; ES 2672070 T3 20180612; KR 101304009 B1 20130904; KR 20110084545 A 20110725; PL 2371978 T3 20180928
DOCDB simple family (application)
JP 2009069464 W 20091117; CN 200980154581 A 20091117; EP 09827543 A 20091117; ES 09827543 T 20091117; KR 20117013957 A 20091117; PL 09827543 T 20091117