EP 1553202 A1 20050713 - Ultra-high strength steel sheet having excellent hydrogen embrittlement resistance, and method for manufacturing the same
Title (en)
Ultra-high strength steel sheet having excellent hydrogen embrittlement resistance, and method for manufacturing the same
Title (de)
Ultrahochfester Stahl mit ausgezeichneter Beständigkeit gegenüber Wasserstoffversprödung und Verfahren zu seiner Herstellung
Title (fr)
Acier à très haute résistance mécanique ayant une excellente résistance à la fragilisation par l'hydrogène et son procédé de production
Publication
Application
Priority
JP 2004004727 A 20040109
Abstract (en)
The present invention provides an ultra-high strength steel sheet having excellent hydrogen embrittlement resistance, which includes: 0.06 to 0.6% of C; 0.5 to 3% of Si+Al; 0.5 to 3% of Mn; 0.15% or lower of P; and 0.02% or lower of S in terms of mass percentage, and also includes 3% or higher of residual austenite structure, 30% or higher of bainitic ferrite structure, and preferably 50% or lower of polygonal ferrite in terms of an areal ratio to the entire structure, wherein a mean grain size of bainite blocks is smaller than 20 mu m as determined by comparing observations of the same region of the bainitic ferrite structure by EBSP (electron back scatter diffraction pattern) and SEM.
IPC 1-7
IPC 8 full level
C21D 1/20 (2006.01); C21D 8/02 (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 US)
C21D 1/20 (2013.01 - EP US); C21D 8/0247 (2013.01 - EP US); C21D 8/0278 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US)
Citation (search report)
- [PA] EP 1391526 A2 20040225 - KOBE STEEL LTD [JP]
- [A] EP 1207213 A1 20020522 - KAWASAKI STEEL CO [JP]
- [A] EP 1201780 A1 20020502 - NIPPON STEEL CORP [JP]
- [A] PATENT ABSTRACTS OF JAPAN vol. 1999, no. 14 22 December 1999 (1999-12-22)
- [A] PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29)
Designated contracting state (EPC)
AT DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 05250049 A 20050107; US 3010005 A 20050107