Tubular high strength low alloy steel for oil and gas wells

Metal treatment – Compositions – Heat treating

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148 36, C21D 810

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044539860

ABSTRACT:
An article of manufacture is provided comprising a heat treated high strength low-alloy steel tubular product of the L-80 and N-80 type suitable for use as an oil well tubular member. The composition consists essentially of about 0.1 to 0.4% C, about 0.075 to 0.4% Mo, about 0.002 to 0.03% N, about 0.75 to 1.5% Mn, about 0.1 to 0.4% Si, and the balance essentially iron, the carbon and molybdenum contents being controlled and correlated such that for a carbon content ranging from about 0.1 to 0.25%, the molybdenum content ranges from about 0.075 to 0.25%; and for a carbon content ranging from about 0.25 to 0.4%, the molybdenum content ranges from about 0.2 to 0.4%.

REFERENCES:
patent: 3539404 (1970-11-01), DeRetana
patent: 3915697 (1975-10-01), Gioliani et al.
patent: 3976514 (1976-08-01), Matsukura et al.
patent: 4008103 (1977-02-01), Miyoshi et al.
patent: 4204892 (1980-05-01), Economopolous
patent: 4300598 (1981-11-01), Royer et al.
patent: 4388123 (1983-06-01), Murayama
Iron Age, Nov. 12, 1980, "Materials Come First in Sour Gas Drilling", pp. 1-6.

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