EP 1676932 B1 20151021 - High strength thin steel sheet having high hydrogen embrittlement resisting property
Title (en)
High strength thin steel sheet having high hydrogen embrittlement resisting property
Title (de)
Hochfestes dünnes Stahlblech mit hohem Widerstand gegen Wasserstoffversprödung
Title (fr)
Tôle d'acier mince à haute résistance, possedant une résistance accrue à la fragilisation par l'hydrogène
Publication
Application
Priority
- JP 2004381230 A 20041228
- JP 2004381231 A 20041228
- JP 2004381232 A 20041228
- JP 2005147238 A 20050519
- JP 2005147239 A 20050519
- JP 2005147240 A 20050519
Abstract (en)
[origin: EP1676932A1] The purpose of the present invention is to provide a high strength thin steel sheet that has high hydrogen embrittlement resisting property. In order to achieve the above purpose, a high strength thin steel sheet having high hydrogen embrittlement resisting property comprises: C: 0.10 to 0.25%; Si: 1.0 to 3.0%; Mn: 1.0 to 3.5%; P: 0.15% or less; S: 0.02% or less; and Al: 1.5% or less (higher than 0%) in terms of percentage by weight, with balance of iron and inevitable impurities; and the metal structure comprises: residual austenite; 1% by area or more in proportion to the entire structure; bainitic ferrite and martensite: 80% or more in total; and ferrite and pearlite: 9% or less (may be 0%) in total, while the mean axis ratio (major axis/minor axis) of said residual austenite grains is 5 or higher, and the steel has tensile strength of 1180 MPa or higher.
IPC 8 full level
C22C 38/02 (2006.01); C22C 38/04 (2006.01)
CPC (source: EP US)
C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/08 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE FR GB
DOCDB simple family (publication)
EP 1676932 A1 20060705; EP 1676932 B1 20151021; CA 2531615 A1 20060628; KR 100723092 B1 20070530; KR 20060076744 A 20060704; US 2006137768 A1 20060629
DOCDB simple family (application)
EP 05028444 A 20051223; CA 2531615 A 20051223; KR 20050131831 A 20051228; US 31717405 A 20051227