Steel for steel pipes

Details Steel for steel pipes Steel for steel pipes

2007-09-04

2007-09-04

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S330000, C420S084000, C420S105000, C420S106000, C420S110000, C420S111000

Reexamination Certificate

active

11181970

ABSTRACT:
A steel for steel pipes which comprises, on the percent by mass basis, C: 0.2 to 0.7%, Si: 0.01 to 0.8%, Mn: 0.1 to 1.5%, S: 0.005% or less, P: 0.03% or less, Al: 0.0005 to 0.1%, Ti: 0.005 to 0.05%, Ca: 0.0004 to 0.005%, N: 0.007% or less, Cr: 0.1 to 1.5%, Mo: 0.2 to 1.0%, Nb: 0 to 0.1%, Zr: 0 to 0.1%, V: 0 to 0.5% and B: 0 to 0.005%, with the balance being Fe and impurities, in which non-metallic inclusions containing Ca, Al, Ti, N, O, and S are present, and in the said inclusions (Ca %)/(Al %) is 0.55 to 1.72, and (Ca %)/(Ti %) is 0.7 to 19 can be used as a raw material for oil country tubular goods, being used at a greater depth and in severer corrosive circumstances, such as casings and tubings for oil and/or natural gas wells, drilling pipes and drilling collars for excavation, and the like.

REFERENCES:
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patent: 6511553 (2003-01-01), Nakashima et al.
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patent: 2001-131698 (2001-05-01), None
patent: 2002-060893 (2002-02-01), None
patent: 2003-129179 (2003-05-01), None
patent: 2004-002978 (2004-01-01), None

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