EP 2952601 A1 20151209 - ELECTRIC-RESISTANCE-WELDED STEEL PIPE
Title (en)
ELECTRIC-RESISTANCE-WELDED STEEL PIPE
Title (de)
WIDERSTANDSGESCHWEISSTES STAHLROHR
Title (fr)
TUBE D'ACIER SOUDÉ PAR RÉSISTANCE ÉLECTRIQUE
Publication
Application
Priority
- JP 2013016670 A 20130131
- JP 2014052708 W 20140130
Abstract (en)
Provided is an electric resistance welded steel pipe excellent in terms of fatigue strength. An electric resistance welded steel pipe, the steel pipe having a chemical composition containing, by mass%, C: 0.35% or more and 0.55% or less, Si: 0.01% or more and 1.0% or less, Mn: 1.0% or more and 3.0% or less, P: 0.02% or less, S: 0.01% or less, Al: 0.005% or less, N: 0.0050% or less, Cr: 0.1% or more and 0.5% or less, and the balance being Fe and inevitable impurities and a metallic microstructure including pearlite, ferrite, and bainite, in which the area ratio of the pearlite is 85% or more, the total of the area ratios (including 0) of the ferrite and the bainite is 15% or less, and in which a prior austenite grain size is 25 µm or more.
IPC 8 full level
C22C 38/38 (2006.01); C21D 8/10 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (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); C22C 38/40 (2006.01); C22C 38/42 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP US)
C21D 8/105 (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 38/005 (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 38/18 (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); C22C 38/38 (2013.01 - EP US); C22C 38/40 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/009 (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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2952601 A1 20151209; EP 2952601 A4 20160217; EP 2952601 B1 20170927; CN 104968821 A 20151007; CN 104968821 B 20170308; JP 5892267 B2 20160323; JP WO2014119802 A1 20170126; KR 101710816 B1 20170227; KR 20150099831 A 20150901; US 2015368768 A1 20151224; WO 2014119802 A1 20140807
DOCDB simple family (application)
EP 14746008 A 20140130; CN 201480007099 A 20140130; JP 2014052708 W 20140130; JP 2014559807 A 20140130; KR 20157019843 A 20140130; US 201414765206 A 20140130