EP 2666880 A4 20150225 - STEEL MATERIAL HAVING SUPERIOR TOUGHNESS OF WELDED HEAT-AFFECTED ZONE, AND METHOD FOR MANUFACTURING SAME
Title (en)
STEEL MATERIAL HAVING SUPERIOR TOUGHNESS OF WELDED HEAT-AFFECTED ZONE, AND METHOD FOR MANUFACTURING SAME
Title (de)
STAHLMATERIAL MIT HERVORRAGENDER ZÄHIGKEIT EINER GESCHWEISSTEN WÄRMEBEEINFLUSSTEN ZONE UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
MATÉRIAU D'ACIER À TÉNACITÉ SUPÉRIEURE DE ZONE SOUDÉE, TOUCHÉE PAR LA CHALEUR, ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2011008258 A 20110118
- JP 2011206542 A 20110921
- JP 2012050852 W 20120117
Abstract (en)
[origin: EP2666880A1] This steel material satisfies the following conditions: (a) the ZrO 2 content is 5-50%, the REM oxide content is 5-50%, and the CaO content is 50% or less (excluding 0%) when composition of all oxide-based inclusions is measured and then expressed in terms of the mass of the individual oxides; (b) among all the inclusions, those having a circle equivalent diameter of 0.1-2 µm are present in an amount of 120/mm 2 or greater, oxides larger than 3 µm are present in an amount of 5.0/mm 2 or less, and oxides larger than 5µm are present in an amount of 5.0/mm 2 or less; and when the composition of all the inclusions is measured, (c-1) the number of REM- and Zr-containing inclusions I that satisfy the REM/Zr molar ratio of 0.6-1.4 is 30% or greater in relation to the entire number of inclusions, and/or (c-2) the number of REM-, Zr-, Al-, Ca-, and Ti-containing inclusions II is 40% or greater in relation to the entire number of inclusions, inclusions II satisfying the condition in which the ratio of the total number of moles of REM and Zr and the total number of moles of Al, Ca, and Ti is 0.5-1.2. The HAZ toughness is thereby kept at a very high level even when the material is welded with a high heat input of 50 kJ/mm or greater.
IPC 8 full level
C22C 38/14 (2006.01); C21C 7/04 (2006.01); C21C 7/06 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR)
C21C 7/04 (2013.01 - EP KR); C21C 7/06 (2013.01 - EP KR); C22C 38/001 (2013.01 - EP); C22C 38/002 (2013.01 - EP); C22C 38/005 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/08 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C22C 38/14 (2013.01 - EP KR); C22C 38/16 (2013.01 - EP); C22C 38/28 (2013.01 - EP); C22C 38/38 (2013.01 - EP); C22C 38/58 (2013.01 - KR)
Citation (search report)
- [XA] JP 2010209433 A 20100924 - KOBE STEEL LTD
- [XA] JP 2009179844 A 20090813 - KOBE STEEL LTD
- [XA] JP 2009138255 A 20090625 - KOBE STEEL LTD
- [XA] JP 2009084656 A 20090423 - KOBE STEEL LTD
- [XDA] JP 2009197267 A 20090903 - KOBE STEEL LTD
- [AD] JP 2003221643 A 20030808 - JFE STEEL KK
- [A] EP 1312689 A1 20030521 - SUMITOMO METAL IND [JP]
- See references of WO 2012099119A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2666880 A1 20131127; EP 2666880 A4 20150225; CN 103328672 A 20130925; CN 103328672 B 20150603; JP 2012162797 A 20120830; JP 5651090 B2 20150107; KR 101512257 B1 20150414; KR 20130105713 A 20130925; WO 2012099119 A1 20120726
DOCDB simple family (application)
EP 12736520 A 20120117; CN 201280005110 A 20120117; JP 2011206542 A 20110921; JP 2012050852 W 20120117; KR 20137018728 A 20120117