Steel plates for ultra-high-strength linepipes and...

Details Steel plates for ultra-high-strength linepipes and... Steel plates for ultra-high-strength linepipes and...

2004-12-17

2010-06-15

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S330000, C148S331000, C148S332000, C148S333000, C148S334000, C148S335000, C148S336000, C148S590000, C148S593000, C148S519000, C148S521000, C148S654000

Reexamination Certificate

active

07736447

ABSTRACT:
Ultra-high-strength linepipes having excellent low-temperature toughness manufactured by welding together the edges of steel plates comprising C of 0.03 to 0.07 mass %, Si of not more than 0.6 mass %, Mn of 1.5 to 2.5 mass %, P of not more than 0.015 mass %, S of not more than 0.003 mass %, Ni of 0.1 to 1.5 mass %, Mo of 0.15 to 0.60 mass %, Nb of 0.01 to 0.10 mass %, Ti of 0.005 to 0.030 mass %, Al of not more than 0.06 mass %, one or more of required amounts of B, N, V, Cu, Cr, Ca, REM (rare-earth metals) and Mg, with the remainder consisting of iron and unavoidable impurities and having a (Hv-ave)/(Hv-M) ratio between 0.8 and 0.9 at 2.5≦P≦4.0, wherein Hv-ave is the average Vickers hardness in the direction of the thickness of the base metal and Hv-M is the martensite hardness depending on C-content (Hv-M=270+1300C) and a tensile strength TS-C between 900 MPa and 1100 MPa; P=2.7C+0.4Si+Mn+0.8Cr+0.45(Ni+Cu)+(1+β)Mo−1+β (β=1 when B≧3 ppm and β=0 when B<3 ppm).

REFERENCES:
patent: 4591396 (1986-05-01), Mazuda et al.
patent: 5061325 (1991-10-01), Okamura et al.
patent: 5634988 (1997-06-01), Kurebayashi et al.
patent: 2429439 (2003-11-01), None
patent: 0753596 (1997-01-01), None
patent: 0757113 (1997-02-01), None
patent: 1020539 (2000-07-01), None
patent: 1541252 (2005-06-01), None
patent: 10306347 (1998-11-01), None
patent: 10306348 (1998-11-01), None
patent: 11172330 (1999-06-01), None
patent: 11172374 (1999-06-01), None
patent: 2000199036 (2000-07-01), None
patent: 2004052104 (2004-02-01), None
patent: WO 99/05335 (1999-02-01), None
patent: WO 99/32670 (1999-07-01), None
patent: WO 03/099482 (2003-12-01), None
H.K.D.H. Bhadeshia, “Bainite in Steels, Transformations, Microstructure and Properties” (The University Press, Cambridge, 2001), second edition, p. 190.
“Metals Handbook, Properties and Selection: Irons, Steels, and High-Performance Alloys” (ASM Int'l, 1990), tenth edition, vol. 1, p. 129.

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