EP 2980235 A1 20160203 - STEEL PLATE WITH EXCELLENT HYDROGEN-INDUCED CRACKING RESISTANCE AND TOUGHNESS OF THE WELD HEAT AFFECTED ZONE, AND STEEL TUBE FOR USE AS LINE PIPE
Title (en)
STEEL PLATE WITH EXCELLENT HYDROGEN-INDUCED CRACKING RESISTANCE AND TOUGHNESS OF THE WELD HEAT AFFECTED ZONE, AND STEEL TUBE FOR USE AS LINE PIPE
Title (de)
STAHLPLATTE MIT AUSGEZEICHNETER WASSERSTOFFINDUZIERTER RISSBILDUNGSBESTÄNDIGKEIT UND ZÄHIGKEIT DER DURCH SCHWEISSWÄRME BEEINTRÄCHTIGTEN ZONE UND STAHLROHR ZUR VERWENDUNG ALS EIN LEITUNGSROHR
Title (fr)
PLAQUE EN ACIER PRÉSENTANT UNE EXCELLENTE RÉSISTANCE À LA FISSURATION INDUITE PAR L'HYDROGÈNE ET UNE EXCELLENTE TÉNACITÉ DE LA ZONE EXPOSÉE À LA CHALEUR DE SOUDAGE, ET TUBE EN ACIER DESTINÉ À ÊTRE UTILISÉ COMME TUBE DE CANALISATION
Publication
Application
Priority
- JP 2013074705 A 20130329
- JP 2014058311 W 20140325
Abstract (en)
A steel plate with excellent hydrogen-induced cracking resistance and toughness of the weld heat affected zone (HAZ toughness) and a steel pipe obtained using the steel plate are achieved. The steel plate is characterized to contain specified elements with the remainder consisting of iron and inevitable impurities, in which the ratio of Ca amount and S amount (Ca/S) is 2.0 or more, Ca amount, S amount, and O amount satisfy (Ca-1.25S)/O‰¤1.8, and, in a region from the surface to 5 mm depth in the plate thickness direction, Ca-based inclusions with 50 µm or more of the long diameter or long side are 2.0 pieces/mm 2 or less, and TiN with 300 nm or less of the long diameter or long side is 5×10 2 pieces/µm 2 or more.
IPC 8 full level
C22C 38/00 (2006.01); C21C 7/04 (2006.01); C21D 8/02 (2006.01); C22C 38/14 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP)
C21D 8/0226 (2013.01); C22C 38/14 (2013.01); C22C 38/58 (2013.01); C21C 7/04 (2013.01); C21D 2211/004 (2013.01)
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 2980235 A1 20160203; EP 2980235 A4 20170118; EP 2980235 B1 20180530; CN 105074036 A 20151118; CN 105074036 B 20170531; JP 2014208891 A 20141106; JP 6165088 B2 20170719; KR 101709033 B1 20170221; KR 20150119958 A 20151026; WO 2014157215 A1 20141002
DOCDB simple family (application)
EP 14772647 A 20140325; CN 201480018153 A 20140325; JP 2014052251 A 20140314; JP 2014058311 W 20140325; KR 20157026517 A 20140325