EP 2927339 B1 20161102 - HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE
Title (en)
HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE
Title (de)
HEISSGEWALZTES STAHLBLECH FÜR HOCHFESTE LEITUNGSROHRE
Title (fr)
PLAQUE D'ACIER LAMINÉE À CHAUD DESTINÉE À UN TUYAU DE CANALISATION À HAUTE RÉSISTANCE
Publication
Application
Priority
- JP 2013010976 A 20130124
- JP 2014000320 W 20140123
Abstract (en)
[origin: EP2927339A1] Provided is an electric resistance welded steel pipe for a high strength linepipe excellent in terms of HIC resistance. A hot-rolled steel sheet for a high strength linepipe, the steel sheet having a chemical composition containing, by mass%, C: 0.02% or more and 0.06% or less, Si: 0.05% or more and 0.25% or less, Mn: 0.60% or more and 1.10% or less, P: 0.008% or less, S: 0.0010% or less, Nb: 0.010% or more and 0.060% or less, Ti: 0.001% or more and 0.020% or less, Mo: 0.05% or less, Cr: 0.05% or more and 0.50% or less, Al: 0.01% or more and 0.08% or less, Ca: 0.0005% or more and 0.0050% or less, O: 0.005% or less, one or more selected from among Cu: 0.50% or less, Ni: 0.50% or less, and V: 0.10% or less, and the balance being Fe and inevitable impurities, and a metallic structure composed of bainitic-ferrite, in which expression (1) below is satisfied, and in which the ratio of the hardness of a center segregation part to the hardness of a non-segregation part is less than 1.20. SP ‰¤ 1.90 where SP is derived from SP = Mn + Mo + 11.3 × C + 0.29 × (Cu + Ni) + 0.60 × Cr + 0.88 × V, and where atomic symbols in the equation respectively represent the contents (mass%) of the corresponding chemical elements.
IPC 8 full level
C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01)
CPC (source: EP US)
C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0263 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/00 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/20 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C21D 2211/004 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US)
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 2927339 A1 20151007; EP 2927339 A4 20151216; EP 2927339 B1 20161102; CN 104937125 A 20150923; CN 104937125 B 20180109; JP 5884202 B2 20160315; JP WO2014115549 A1 20170126; KR 101718267 B1 20170320; KR 20150087424 A 20150729; US 2015368736 A1 20151224; WO 2014115549 A1 20140731
DOCDB simple family (application)
EP 14743980 A 20140123; CN 201480005063 A 20140123; JP 2014000320 W 20140123; JP 2014558503 A 20140123; KR 20157017737 A 20140123; US 201414763403 A 20140123