EP 1520912 A3 20050427 - Steel excellent in toughness of weld heat-affected zone
Title (en)
Steel excellent in toughness of weld heat-affected zone
Title (de)
Stahl mit durch Schweissen beeinflusster Zone mit ausgezeichneter Zähigkeit
Title (fr)
Acier présentant une excellente ténacité de la zone affectée thermiquement par soudage
Publication
Application
Priority
- EP 00974966 A 20001113
- JP 2000033241 A 20000210
- JP 2000033242 A 20000210
- JP 2000068210 A 20000313
Abstract (en)
[origin: EP1262571A1] The present invention realizes excellent HAZ toughness by further suppressing the coarsening of austenite grains when they are heated for a long time at a high temperature in order to remarkably improve HAZ properties. The present invention is a steel excellent in the toughness of a weld heat-affected zone: having a specific chemical composition; satisfying the expression 0 </= EN </= 0.002 regarding the EN value expressed by an equivalent equation comprising (%N), (%Ti) and (%B); and containing oxide particles 0.005 to 2.0 mu m, preferably 0.1 to 2.0 mu m, in circle-equivalent diameter, which oxide particles contain at least Ca, Al and O in their composition and, in the mass percentage of the elements excluding O, contain Ca at 5% or more and Al at 5% or more with the balance consisting of other deoxidizing elements and/or unavoidable impurities, with the density of the oxide particles being 100 to 3,000 pieces/mm<2>. <IMAGE>
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/14 (2006.01)
CPC (source: EP KR)
C22C 38/00 (2013.01 - KR); C22C 38/002 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/14 (2013.01 - EP)
Citation (search report)
- [X] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 12 31 October 1998 (1998-10-31)
- [A] PATENT ABSTRACTS OF JAPAN vol. 1999, no. 13 30 November 1999 (1999-11-30)
- [A] PATENT ABSTRACTS OF JAPAN vol. 2000, no. 04 31 August 2000 (2000-08-31)
- [A] PATENT ABSTRACTS OF JAPAN vol. 1996, no. 10 31 October 1996 (1996-10-31)
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
EP 1262571 A1 20021204; EP 1262571 A4 20030326; EP 1262571 B1 20050810; DE 60021919 D1 20050915; DE 60021919 T2 20060608; DE 60033070 D1 20070308; DE 60033070 T2 20070531; EP 1520912 A2 20050406; EP 1520912 A3 20050427; EP 1520912 B1 20070117; KR 100514667 B1 20050914; KR 20020073579 A 20020927; WO 0159167 A1 20010816
DOCDB simple family (application)
EP 00974966 A 20001113; DE 60021919 T 20001113; DE 60033070 T 20001113; EP 04026201 A 20001113; JP 0007999 W 20001113; KR 20027010139 A 20020806