EP 2371978 A4 20160504 - STEEL SHEET, SURFACE-TREATED STEEL SHEET, AND METHOD FOR PRODUCING THE SAME
Title (en)
STEEL SHEET, SURFACE-TREATED STEEL SHEET, AND METHOD FOR PRODUCING THE SAME
Title (de)
STAHLBLECH, OBERFLÄCHENBEHANDELTES STAHLBLECH UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
FEUILLE D'ACIER, FEUILLE D'ACIER TRAITÉE EN SURFACE ET SON PROCÉDÉ DE PRODUCTION
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
B21B 3/00 (2006.01); B22D 11/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (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)
Citation (search report)
- [X] EP 1516938 A1 20050323 - NIPPON STEEL CORP [JP]
- [X] JP 2007070649 A 20070322 - NIPPON STEEL CORP
- [X] JP 2007070659 A 20070322 - NIPPON STEEL CORP
- [X] CA 2231760 A1 19990911 - NISSHIN STEEL CO LTD [JP]
- See references of WO 2010058762A1
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