EP 3392361 A4 20190612 - THICK STEEL PLATE HAVING EXCELLENT CRYOGENIC TOUGHNESS
Title (en)
THICK STEEL PLATE HAVING EXCELLENT CRYOGENIC TOUGHNESS
Title (de)
DICKE STAHLPLATTE MIT HERVORRAGENDER KRYOGENER ZÄHIGKEIT
Title (fr)
PLAQUE D'ACIER ÉPAISSE AYANT UNE EXCELLENTE ENDURANCE CRYOGÉNIQUE
Publication
Application
Priority
- JP 2015247748 A 20151218
- JP 2016086863 W 20161212
Abstract (en)
[origin: EP3392361A1] To provide a thick steel plate having excellent cryogenic toughness particularly in the C-direction when the minimum value of absorption energy satisfies 150 J or more, on the assumption that a tensile strength is 690 to 830 MPa, a yield strength is 590 MPa or more, and a brittle fracture rate is 10% or less when a Charpy impact test is performed at -196°C in a Ni steel having a Ni content of 5.50 to 7.50%. Disclosed is a thick steel plate having excellent cryogenic toughness, which satisfies a predetermined composition, wherein a volume fraction v of the residual austenite phase existing at -196°C is 4.0 to 12%, and a fracture unit configuration parameter M value represented by the following formula (1) satisfies 2.4 or more when t is a thickness of the thick steel plate. In the following formula (1), DI is a value calculated by the following formula (2) and [ ] represents the content (% by mass) of each element. M value = DI × v 2 / t DI = 1.16 × C / 10 0.5 × 0.7 × Si + 1 × 1 + 3.33 × Mn × 1 + 0.35 × Cu × 1 + 0.36 × Ni × 1 + 2.16 × Cr × 1 + 3 × Mo × 1 + 1.75 × V × 1
IPC 8 full level
C22C 38/44 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01)
CPC (source: EP KR)
C21D 8/02 (2013.01 - KR); C22C 38/001 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP KR); C22C 38/42 (2013.01 - EP KR); C22C 38/44 (2013.01 - EP KR); C22C 38/46 (2013.01 - EP); C22C 38/48 (2013.01 - EP); C22C 38/50 (2013.01 - EP); C21D 6/004 (2013.01 - EP); C21D 8/0205 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C21D 2211/001 (2013.01 - EP)
Citation (search report)
- [XI] JP 2015086403 A 20150507 - JFE STEEL CORP
- [XI] JP 2014210948 A 20141113 - KOBE STEEL LTD
- [XI] JP 2014118579 A 20140630 - KOBE STEEL LTD
- [XI] JP 2013213273 A 20131017 - KOBE STEEL LTD
- [XI] JP 2013234381 A 20131121 - KOBE STEEL LTD
- [XI] EP 2889391 A1 20150701 - KOBE STEEL LTD [JP]
- [XI] EP 2933347 A1 20151021 - KOBE STEEL LTD [JP]
- [XI] EP 2592166 A1 20130515 - NIPPON STEEL & SUMITOMO METAL CORP [JP]
- See references of WO 2017104599A1
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 3392361 A1 20181024; EP 3392361 A4 20190612; CN 108368579 A 20180803; JP 2017115239 A 20170629; KR 20180086443 A 20180731; WO 2017104599 A1 20170622
DOCDB simple family (application)
EP 16875576 A 20161212; CN 201680073537 A 20161212; JP 2016086863 W 20161212; JP 2016238829 A 20161208; KR 20187017177 A 20161212