EP 3447162 B1 20201230 - THICK STEEL PLATE
Title (en)
THICK STEEL PLATE
Title (de)
DICKE STAHLPLATTE
Title (fr)
PLAQUE D'ACIER ÉPAISSE
Publication
Application
Priority
- JP 2016085147 A 20160421
- JP 2016085148 A 20160421
- JP 2017016090 W 20170421
Abstract (en)
[origin: EP3447162A1] A thick steel plate is provided that has a chemical composition comprising, by mass%, C: 0.01-0.20%, Si: 0.10-0.25%, Mn: 1.30-2.50%, P: 0.01% or less, S: 0.0010-0.0100%, Ti: 0.005-0.030%, Al: 0.003% or less, O: 0.0010-0.0050%, N: 0.0100% or less, Cu: 0-0.50%, Ni: 0-1.50%, Cr: 0-0.50%, Mo: 0-0.50%, V: 0-0.10%, Nb: 0-0.05%, and the balance: Fe and impurities, and which contains in the steel a composite inclusion in which MnS is present around a Ti oxide. An area fraction of MnS in a cross-section of the composite inclusion is 10% or more and less than 90%, the proportion which MnS accounts for in the peripheral length of the composite inclusion is 10% or more, and the number density of composite inclusions that have a grain diameter in a range of 0.5-5.0 µm is in a range of 10-100 per mm 2 . The thick steel plate exhibits excellent HAZ low-temperature properties during high heat input welding.
IPC 8 full level
C22C 38/00 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/18 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR)
C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C22C 38/001 (2013.01 - EP); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP); C22C 38/08 (2013.01 - EP); C22C 38/14 (2013.01 - EP KR); C22C 38/16 (2013.01 - EP KR); C22C 38/18 (2013.01 - EP)
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 3447162 A1 20190227; EP 3447162 A4 20191002; EP 3447162 B1 20201230; CN 109072383 A 20181221; CN 109072383 B 20210209; KR 20180132909 A 20181212; WO 2017183720 A1 20171026
DOCDB simple family (application)
EP 17786057 A 20170421; CN 201780024463 A 20170421; JP 2017016090 W 20170421; KR 20187033428 A 20170421