EP 1548142 A1 20050629 - High-strength cold-rolled steel sheet excellent in coating film adhesion
Title (en)
High-strength cold-rolled steel sheet excellent in coating film adhesion
Title (de)
Hochfestes, Kaltgewalztes Stahlblech mit Ausgezeichneter Adhesion von Beschichtung
Title (fr)
Tôle d'acier à résistance élevée laminée à froid, ayant une excellente adhesivité d'une couche de revêtement
Publication
Application
Priority
JP 2003429151 A 20031225
Abstract (en)
A cold-rolled steel sheet of DP (Dual Phase) type with a specific composition meets the requirements: (I) In the surface of the steel sheet, there exist Si-Mn complex oxides no larger than 5 mu m in diameter of the equivalent circle as many as 10 or more per 100 mu m<2> and the coverage of oxides composed mainly of Si on the surface of steel sheet is no more than 10% of surface area, and/or (II) The cross section near the surface of the steel sheet does not show cracks with a width no larger than 3 mu m and a depth no smaller than 5 mu m in arbitrary ten fields of observation under an SEM with a magnification of 2000. A high-strength cold-rolled steel sheet excellent in coating film adhesion and having a tensile strength no lower than 550 MPa is provided.
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C21D 9/48 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 30/00 (2006.01); C21D 8/02 (2006.01)
CPC (source: EP US)
C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C23C 30/00 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0236 (2013.01 - EP US); C21D 8/0278 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [A] PATENT ABSTRACTS OF JAPAN vol. 2002, no. 04 4 August 2002 (2002-08-04)
- [DA] PATENT ABSTRACTS OF JAPAN vol. 017, no. 073 (C - 1026) 15 February 1993 (1993-02-15)
- [A] PATENT ABSTRACTS OF JAPAN vol. 2003, no. 09 3 September 2003 (2003-09-03)
- [A] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 11 30 September 1998 (1998-09-30)
- [A] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 04 31 March 1998 (1998-03-31)
- [DPA] DATABASE WPI Section Ch Week 200477, Derwent World Patents Index; Class M24, AN 2004-780743, XP002314973
Designated contracting state (EPC)
AT DE FR GB
DOCDB simple family (publication)
EP 1548142 A1 20050629; EP 1548142 B1 20080820; EP 1548142 B2 20130703; AT E405685 T1 20080915; DE 602004015922 D1 20081002; DE 602004015922 T3 20130912; JP 2005187863 A 20050714; JP 3934604 B2 20070620; US 2005139293 A1 20050630
DOCDB simple family (application)
EP 04028368 A 20041130; AT 04028368 T 20041130; DE 602004015922 T 20041130; JP 2003429151 A 20031225; US 99895004 A 20041130