EP 2157197 A2 20100224 - SEAMLESS STEEL PIPE TO BE USED AS A STEEL CATENARY RISER IN THE TOUCHDOWN ZONE
Title (en)
SEAMLESS STEEL PIPE TO BE USED AS A STEEL CATENARY RISER IN THE TOUCHDOWN ZONE
Title (de)
NAHTLOSES STAHLROHR ZUR VERWENDUNG ALS AUFGEHÄNGTE STEIGLEITUNG AUS STAHL IM AUFSETZBEREICH
Title (fr)
CONDUITE EN ACIER SANS SOUDURE UTILISÉE COMME ÉLÉVATEUR CATÉNAIRE D'ACIER DANS LA ZONE DE CONTACT
Publication
Application
Priority
- MX 2008000041 W 20080314
- US 91806507 P 20070315
- US 7387908 A 20080311
Abstract (en)
The present invention describes an upset SCR of novel low carbon chemical composition and microstructure as well as method of manufacturing the same, which achieves higher improvement in the fatigue life as it is integral with the riser pipe section at the Touch Down Zone. The low carbon upset SCR achieves its desired properties by the thermal treatment which it is subjected to. The novel low carbon chemical composition and microstructure comprises in weight per cent, carbon 0.04-0.10, manganese 0.40-0.70, silicon 0.15-0.35, chromium 0.40-0.70, molybdenum 0.40- 0.70, nickel 0.10-0.40, nitrogen 0.008 max, aluminum 0.010-0.045, sulfur 0.005 max, phosphorus 0.020 max, titanium 0.003-0.020, niobium 0.020-0.035, vanadium no more than 0.10, copper 0.20 max, tin 0.020 max, and carbon equivalent 0.43 max and PCM no more than 0.23 and having a yield strength of at least of 65000 psi, the ultimate tensile strength of at least 77000 psi and YS/UTS ratio below 0.89 in material representing the pipe body, the transition zone and the upset end.
IPC 8 full level
C21D 9/08 (2006.01); C22C 38/18 (2006.01); E21B 17/00 (2006.01); F16L 13/02 (2006.01); F16L 23/024 (2006.01)
CPC (source: EP US)
C21D 9/08 (2013.01 - EP US); C22C 38/18 (2013.01 - EP US); E21B 17/015 (2013.01 - EP US)
Citation (search report)
See references of WO 2008111828A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
EP 2157197 A2 20100224; BR PI0808963 A2 20140826; CA 2680943 A1 20080918; CA 2680943 C 20141209; MX 2009009905 A 20100118; MX 340352 B 20160705; NO 20093020 L 20100104; US 2008226396 A1 20080918; WO 2008111828 A2 20080918; WO 2008111828 A3 20090115
DOCDB simple family (application)
EP 08741588 A 20080314; BR PI0808963 A 20080314; CA 2680943 A 20080314; MX 2008000041 W 20080314; MX 2009009905 A 20090915; NO 20093020 A 20090918; US 7387908 A 20080311