EP 1659191 A4 20120229 - HIGH TENSILE STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR PRODUCTION THEREOF
Title (en)
HIGH TENSILE STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR PRODUCTION THEREOF
Title (de)
HOCHZUGFESTES KALTGEWALZTES STAHLBLECH UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TOLE D'ACIER LAMINE A FROID A HAUTE RESISTANCE A LA TRACTION ET SON PROCEDE DE PRODUCTION
Publication
Application
Priority
- JP 2004012160 W 20040818
- JP 2003301473 A 20030826
- JP 2004208834 A 20040715
Abstract (en)
[origin: EP1659191A1] The high tensile cold-rolled steel sheet consists essentially of 0.04 to 0.13% C, 0.3 to 1.2% Si, 1.0 to 3.5% Mn, 0.04% or less P, 0.01% or less S, 0.07% or less Al, by mass, and balance of Fe and inevitable impurities, has a microstructure containing 50% or larger area percentage of ferrite and 10% or larger area percentage of martensite, has 0.85 to 1.5 of ratio of intervals of the martensite in the rolling direction to those in the sheet thickness direction, and has 8 GPa or larger nano strength of the martensite. The high tensile cold-rolled steel sheet has a good strength-elongation balance, and shows excellent crashworthiness at about 10 s -1 of strain rate. Therefore, the high tensile cold-rolled steel sheet is suitable for reinforcing members for pillar and dashboard of automobile.
IPC 8 full level
C22C 38/00 (2006.01); C21D 8/04 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C21D 8/02 (2006.01)
CPC (source: EP US)
C21D 8/0436 (2013.01 - EP US); C21D 8/0473 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C21D 8/0236 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [XP] JP 2004169180 A 20040617 - JFE STEEL KK
- [XA] EP 1193322 A1 20020403 - KAWASAKI STEEL CO [JP]
- [X] JP 2002226937 A 20020814 - KAWASAKI STEEL CO
- [A] JP H083677 A 19960109 - KAWASAKI STEEL CO
- [A] US 2003129444 A1 20030710 - MATSUOKA SAIJI [JP], et al
- [E] EP 1486574 A1 20041215 - JFE STEEL CORP [JP]
- See also references of WO 2005019487A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1659191 A1 20060524; EP 1659191 A4 20120229; EP 1659191 B1 20140730; CA 2522607 A1 20050303; CA 2522607 C 20100601; KR 20060032139 A 20060414; US 2006231176 A1 20061019; WO 2005019487 A1 20050303
DOCDB simple family (application)
EP 04772121 A 20040818; CA 2522607 A 20040818; JP 2004012160 W 20040818; KR 20057021725 A 20051115; US 55389805 A 20051021