Steel product for oil country tubular good

Details Steel product for oil country tubular good Steel product for oil country tubular good

2006-08-01

2006-08-01

Ip, Sikyin (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Utilizing disclosed mathematical formula or relationship

C148S334000, C148S505000, C420S105000, C420S107000, C420S110000, C420S111000

Reexamination Certificate

active

07083686

ABSTRACT:
A steel product for oil country tubular good according to the invention comprises, in mass %, 0.10% to 0.35% C, 0.10% to 0.50% Si, 0.10% to 0.80% Mn, up to 0.030% P, up to 0.010% S, 0.30% to 1.20% Cr, 0.20% to 1.00% Mo, 0.005% to 0.40% V, 0.005% to 0. 100% Al, up to 0.0100% N, up to 0.0010% H, 0 to 0.01% Ca, 0 to 0.050% Ti, 0 to 0.050% Nb, and 0 to 0.0050% B, and the balance of Fe and impurities. The Cr, Mo, and V contents and the grain size GS satisfy expression (1):in-line-formulae description="In-line Formulae" end="lead"?0.7≦(1.5×Cr+2.5×Mo+V)−GS/10≦2.6   (1)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 2004/0149359 (2004-08-01), Michaud et al.
patent: 2847910 (2004-06-01), None
patent: 61-223166 (1986-10-01), None
patent: 03-020443 (1991-01-01), None
patent: 04-021718 (1992-01-01), None
patent: 06-116635 (1994-04-01), None

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