EP 3425076 B1 20211110 - LOW-ALLOY, HIGH-STRENGTH SEAMLESS STEEL PIPE FOR OIL COUNTRY TUBULAR GOODS
Title (en)
LOW-ALLOY, HIGH-STRENGTH SEAMLESS STEEL PIPE FOR OIL COUNTRY TUBULAR GOODS
Title (de)
NIEDRIGLEGIERTES, HOCHFESTES NAHTLOSES STAHLROHR FÜR ÖLFELDROHRE
Title (fr)
TUBE EN ACIER FAIBLEMENT ALLIÉ SANS SOUDURE, À HAUTE RÉSISTANCE POUR PRODUITS TUBULAIRES POUR PUITS DE PÉTROLE
Publication
Application
Priority
- JP 2016036575 A 20160229
- JP 2016004915 W 20161118
Abstract (en)
[origin: EP3425076A1] A low alloy high strength seamless steel pipe for oil country tubular goods having excellent SSC resistance is provided. The steel pipe of the present invention is a low alloy high strength seamless steel pipe for oil country tubular goods including a composition containing, in terms of mass%, C: 0.25 to 0.31%, Si: 0.01 to 0.35%, Mn: 0.45 to 0.70%, P: 0.010% or less, S : 0.001% or less, O: 0.0015% or less, Al: 0.015 to 0.080%, Cu: 0.02 to 0.09%, Cr: 0.8 to 1.5%, Mo: 1.1 to 1.6%, V: 0.01 to 0.06%, Nb: 0.005 to 0.015%, B: 0.0015 to 0.0030%, Ti: 0.005 to 0.020%, and N: 0.005% or less, and having a value of a ratio of the Ti content to the N content (Ti/N) of 3.0 to 4.0, with the balance being Fe and inevitable impurities, the steel pipe having a value (Ã 0.7 /Ã 0.4 ), as a ratio of a stress at a strain of 0.7% to a stress at a strain of 0.4% in a stress-strain curve, of 1.02 or less and a yield strength of 861 MPa or more.
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 6/02 (2006.01); C21D 8/10 (2006.01); C21D 9/08 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01)
CPC (source: EP US)
C21D 1/18 (2013.01 - EP US); C21D 6/002 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C21D 6/02 (2013.01 - EP US); C21D 8/105 (2013.01 - EP US); C21D 9/08 (2013.01 - EP US); C22C 38/00 (2013.01 - EP US); C22C 38/001 (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 38/32 (2013.01 - EP US); E21B 17/00 (2013.01 - US); C21D 8/10 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/004 (2013.01 - EP US); C21D 2211/008 (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 3425076 A1 20190109; EP 3425076 A4 20190424; EP 3425076 B1 20211110; AR 107720 A1 20180523; BR 112018017250 A2 20190514; BR 112018017250 B1 20211005; MX 2018010363 A 20181206; NZ 744668 A 20191129; US 2019048444 A1 20190214; WO 2017149571 A1 20170908
DOCDB simple family (application)
EP 16892416 A 20161118; AR P170100470 A 20170224; BR 112018017250 A 20161118; JP 2016004915 W 20161118; MX 2018010363 A 20161118; NZ 74466816 A 20161118; US 201616078924 A 20161118