EP 3299486 A1 20180328 - THICK STEEL SHEET AND WELDED JOINT
Title (en)
THICK STEEL SHEET AND WELDED JOINT
Title (de)
DICKES STAHLBLECH UND SCHWEISSVERBINDUNG
Title (fr)
TÔLE D'ACIER ÉPAISSE ET JOINT SOUDÉ
Publication
Application
Priority
- JP 2015104617 A 20150522
- JP 2016064064 A 20160328
- JP 2016064444 W 20160516
Abstract (en)
The purpose of the present invention is to provide a thick steel sheet having excellent sour resistance. The present invention is a thick steel sheet which contains, in mass%, 0.01-0.12% of C, 0.02-0.50% of Si, 0.6-2.0% of Mn, more than 0% but 0.030% or less of P, more than 0% but 0.004% or less of S, 0.010-0.080% of Al, 0.10-1.50% of Cr, 0.002-0.050% of Nb, 0.0002-0.05% of REM, 0.0003-0.01% of Zr, 0.0003-0.006% of Ca, more than 0% but 0.010% or less of N, and more than 0% but 0.0040% or less of O, with the balance made up of iron and unavoidable impurities. With respect to the composition of the inclusions contained in the steel and having widths of 1 µm or more, the Zr amount in the inclusions is within 1-40%, the REM amount in the inclusions is within 5-50%, the Al amount in the inclusions is within 3-30% and the Ca amount in the inclusions is within 5-60%.
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/38 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR)
C21C 7/0645 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C22C 38/001 (2013.01 - EP); C22C 38/002 (2013.01 - EP KR); C22C 38/005 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP); C22C 38/20 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/26 (2013.01 - EP KR); C22C 38/28 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/38 (2013.01 - EP KR); C22C 38/48 (2013.01 - EP KR); C22C 38/58 (2013.01 - EP KR); C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C21D 9/14 (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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3299486 A1 20180328; EP 3299486 A4 20181205; CN 107614724 A 20180119; JP 2016216819 A 20161222; KR 20170138505 A 20171215
DOCDB simple family (application)
EP 16799856 A 20160516; CN 201680028437 A 20160516; JP 2016064064 A 20160328; KR 20177033268 A 20160516