High-strength steel for seamless, weldable steel pipes

Details High-strength steel for seamless, weldable steel pipes High-strength steel for seamless, weldable steel pipes

2011-08-30

2011-08-30

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S333000, C148S334000, C148S591000, C148S593000

Reexamination Certificate

active

08007603

ABSTRACT:
A low-alloy steel containing, by weight percent, C 0.03-0.13%, Mn 0.90-1.80%, Si≦0.40%, P≦0.020%, S≦0.005%, Ni 0.10-1.00%, Cr 0.20-1.20%, Mo 0.15-0.80%, Ca≦0.040%, V≦0.10%, Nb≦0.040%, Ti≦0.020% and N≦0.011% for making high-strength, weldable steel seamless pipe, characterized in that the microstructure of the alloy steel is a mixture of bainite and martensite and the yield stress is at least 621 MPa (90 Ksi).It is a second object of the present invention to provide a high-strength, weldable steel seamless pipe, comprising an alloy steel containing, by weight percent, C 0.03-0.13%, Mn 0.90-1.80%, Si≦0.40%, P≦0.020%, S≦0.005%, Ni 0.10-1.00%, Cr 0.20-1.20%, Mo 0.15-0.80%, Ca≦0.040%, V≦≦0.10%, Nb≦0.040%, Ti≦0.020% and N≦0.011% also characterized in that the microstructure of the alloy steel is predominantly martensite and the yield stress is at least 690 MPa (100 ksi).

REFERENCES:
patent: 4407681 (1983-10-01), Ina et al.
patent: 4721536 (1988-01-01), Koch
patent: 4814141 (1989-03-01), Imai et al.
patent: 5454883 (1995-10-01), Yoshie et al.
patent: 6217676 (2001-04-01), Takabe et al.
patent: 7744708 (2010-06-01), Lopez et al.
patent: 7862667 (2011-01-01), Turconi et al.
patent: 2002/0011284 (2002-01-01), Von Hagen et al.
patent: 2003/0155052 (2003-08-01), Kondo
patent: 2005/0076975 (2005-04-01), Lopez
patent: 2005/0087269 (2005-04-01), Merwin
patent: 2007/0089813 (2007-04-01), Tivelli et al.
patent: 2008/0047635 (2008-02-01), Kondo et al.
patent: 2008/0219878 (2008-09-01), Kondo et al.
patent: 2010/0068549 (2010-03-01), Agazzi et al.
patent: 2010/0193085 (2010-08-01), Garcia et al.
patent: 2010/0294401 (2010-11-01), Gomez et al.
patent: 2010/0319814 (2010-12-01), Perez et al.
patent: 2010/0327550 (2010-12-01), Lopez et al.
patent: 0 658 632 (1995-06-01), None
patent: 0 828 007 (1998-03-01), None
patent: 1 008 660 (2000-06-01), None
patent: 1 413 639 (2004-04-01), None
patent: 60-86209 (1985-05-01), None
patent: 61-270355 (1986-11-01), None
patent: 403006329 (1991-01-01), None
patent: 08 311551 (1996-11-01), None
patent: 09 235617 (1997-09-01), None
patent: 10176239 (1998-06-01), None
patent: 10 280037 (1998-10-01), None
patent: 11 050148 (1999-02-01), None
patent: 11140580 (1999-05-01), None
patent: 11229079 (1999-08-01), None
patent: 2000-063940 (2000-02-01), None
patent: 2001-131698 (2001-10-01), None
patent: 2001-271134 (2001-10-01), None
patent: WO 00/70107 (2000-11-01), None
patent: WO 03/033856 (2003-04-01), None
patent: WO 2004/031420 (2004-04-01), None
patent: WO 2004/097059 (2004-11-01), None
patent: WO 2008/127084 (2008-10-01), None
Davis, J.R. et al. “ASM Specialty Handbook —Carbon and alloy steels” ASM Specialty Handbook, Carbon and Alloy Steels, 1996, pp. 12-27, XP002364757 US.
Written Opinion dated Aug. 10, 2007 for PCT Appl. No. PCT/EP2006/007612.
Response to Written Opinion dated Sep. 6, 2007 for PCT Appl. No. PCT/EP2006/007612.
Written Opinion dated Jul. 11, 2007 for PCT Appl. No. PCT/EP2006/007612.
Response to Written Opinion dated Jun. 4, 2007. (Amendments under PCT Article 34) for PCT Appl. No. PCT/EP2006/007612.
U.S. Appl. No. 12/979,058, filed Dec. 27, 2010 and its ongoing prosecution history, including without limitation Office Actions, Amendments, Remarks, and any other potentially relevant documents, Turconi et al.
International Search Report dated Oct. 16, 2006 for PCT Appl. No. PCT/EP2006/007612.
Response to International Search Report dated Dec. 18, 2006 for PCT Appl. No. PCT/EP2006/007612, filed Jan. 8, 2006.
Written Opinion dated Feb. 4, 2008 under Rule 43 for PCT Appl. No. PCT/EP2006/007612.
IPER and Response dated Dec. 10, 2007 for PCT Appl. No. PCT/EP2006/007612.
R. K. Aggarwal et al.,Qualifications of Solutions for Improving Fatigue Life at SCR Tough Down Zone, Deep Offshore Technology Conference, Vitoria, Espirito Santo, Brazil (Nov. 8-10, 2005) 12 pages.
A. Izquierdo et al.,Qualification of Weldable X65 Grade Riser Sections with Upset Ends to Improve Fatigue Performance of Deepwater Steel Catenary Risers, Proceedings of the Eighteenth International Offshore and Polar Engineering,Conference, Vancouver, BC, Canada (Jul. 6-11, 2008) p. 71.
Tenaris Newsletter for Pipeline Services, May 2003, pp. 1-8.
Tenaris Newsletter for Pipeline Service, Apr. 9, 2005, 1-8.
R. Thethi and D. Walters,Alternative Construction for High Pressure High Temperature Steel Catenary Risers, OPT USA (Sep. 2003) p. 1-13.

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