US4400209A Expired / Lapsed US ⏱️ 0.0 years remaining

Alloy for making high strength deep well casing and tubing having improved resistance to stress-corrosion cracking

Assignee: Nippon Steel Corp

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Filing: 1982-06-01

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Granted: 1983-08-23

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Expires: 2002-06-01

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Abstract

Abstract An alloy useful for manufacturing high strength deep well casing, tubing and drill pipes for use in oil-well operations is disclosed. The alloy exhibits improved resistance to stress corrosion cracking in the H2S-CO2-Cl- environment, which comprises the following alloy composition: -C: </= 0.1% Si: </= 1.0% -Mn: </= 2.0% P: </= 0.030% -S: </= 0.005% N: 0-0.30% -Ni: 25-60% Cr: 22.5-40% -Mo: 0-3.5% (excl.) W: 0-7% (excl.) -Cr (%) + 10Mo (%) + 5W (%) >/= 50%, -1.0% </= Mo (%) + 1/2W (%) < 3.5% -Cu: 0-2.0% Co: 0-2.0% -Rare earths: 0-0.10% Y: 0-0.20% -Mg: 0-0.10% Ca: 0-0.10% -one or more of Nb, Ti, Ta, Zr and V in the total -amount of 0.5-4.0, if necessary, -Fe and incidental impurities: balance. -

Inventors

👤 Takeo Kudo
👤 Yasutaka Okada
👤 Taishi Moroishi
👤 Akio Ikeda
👤 Hiroo Ohtani
👤 Kunihiko Yoshikawa

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-10-31 22:26

CPC Classifications

C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/052; E; E21; E21B; E21B17/00

Claims Analysis

Total Claims: 28

Claim 1

Independent Claim 91 words

An alloy for use in manufacturing high strength deep well casing and tubing having improved resistance to stress-corrosion cracking, the alloy composition consisting essentially of: ______________________________________ C: ≦ 0.1% Si: ≦ 1.0% Mn: ≦ 2.0% P: ≦ 0.030% S: ≦ 0.005% N: 0-0.30% Ni: 25-60% Cr: 22.5-40% Mo: 0-3.5% (excl.) W: 0-7% (excl.) Cr (%) + 10Mo (%) + 5W (%) ≧ 50%, 1.0% ≦ Mo (%) + 1/2W (%) < 3.5% Cu: 0-2.0% Co: 0-2.0% Rare earths: 0-0.10% Y: 0-0.20% Mg: 0-0.10% Ca: 0-0.10% Fe and incidental impurities: balance. ______________________________________

Claim 2

Dependent Claim 91 words

Claim 3

Dependent Claim 20 words

An alloy as defined in claim 1, in which the nickel content is 35-60% and the chromium content is 24-35%.

Claim 4

Dependent Claim 17 words

An alloy as defined in claim 1, in which the sulfur content is not more than 0.0007%.

Claim 5

Dependent Claim 20 words

An alloy as defined in claim 1, 2 or 3, in which the phosphorus content is not more than 0.003%.

Claim 6

Dependent Claim 108 words

An alloy for use in manufacturing high strength deep well casing and tubing having improved resistance to stress corrosion cracking, the alloy composition consisting essentially of: ______________________________________ C: ≦ 0.1% Si: ≦ 1.0% Mn: ≦ 2.0% P: ≦ 0.030% S: ≦ 0.005% N: 0-0.30% Ni: 25-60% Cr: 22.5-40% Mo: 0-3.5% (excl.) W: 0-7% (excl.) Cr (%) + 10Mo (%) + 5W (%) ≧ 50% 1.0% ≦ Mo (%) + 1/2W (%) < 3.5% Cu: 0-2.0% Co: 0-2.0% Rare earths: 0-0.10% Y: 0-0.20% Mg: 0-0.10% Ca: 0-0.10% one or more of Nb, Ti, Ta, Zr and V in the total amount of 0.5-4.0% Fe and incidental impurities: balance. ______________________________________

Claim 7

Dependent Claim 108 words

Claim 8

Dependent Claim 20 words

An alloy as defined in claim 5, in which the nickel content is 35-60% and the chromium content is 24-35%.

Claim 9

Dependent Claim 17 words

An alloy as defined in claim 5, in which the sulfur content is not more than 0.0007%.

Claim 10

Dependent Claim 20 words

An alloy as defined in claim 5, 6 or 7, in which the phosphorous content is not more than 0.003%.

Claim 11

Dependent Claim 91 words

Claim 12

Dependent Claim 91 words

Claim 13

Dependent Claim 20 words

An alloy as defined in claim 9, in which the nickel content is 35-60% and the chromium content is 24-35%.

Claim 14

Dependent Claim 16 words

An alloy as defined in claim 9, in which the sulfur content is more than 0.0007%.

Claim 15

Dependent Claim 20 words

An alloy as defined in claim 9, 10 or 11, in which the phosphorous content is not more than 0.003%.

Claim 16

Dependent Claim 14 words

An alloy as defined in claim 12, in which the N content is 0.10-0.25%.

Claim 17

Dependent Claim 108 words

An alloy for use in manufacturing high strength deep well casing and tubing having improved resistance to stress corrosion cracking, the alloy composition consisting essentially of: ______________________________________ C: ≦ 0.1% Si: ≦ 1.0% Mn: ≦ 2.0% P: ≦ 0.030% S: ≦ 0.005% N: 0.05-0.30% Ni: 25-60% Cr: 22.5-40% Mo: 0-3.5% (excl.) W: 0-7% (excl.) Cr (%) + 10Mo (%) + 5W (%) ≦ 50%, 1.0% ≦ Mo (%) + 1/2W (%) < 3.5% Cu: 0-2.0% Co: 0-2.0% Rare earths: 0-0.10% Y: 0-0.20% Mg: 0-0.10% Ca: 0-0.10% one or more of Nb, Ti, Ta, Zr and V in the total amount of 0.5-4.0% Fe and incidental impurities: balance. ______________________________________

Claim 18

Dependent Claim 108 words

An alloy for use in manufacturing high strength deep well casing and tubing having improved resistance to stress corrosion cracking, the alloy composition consisting essentially of: ______________________________________ C: ≦ 0.1% Si: ≦ 1.0% Mn: ≦ 2.0% P: ≦ 0.030% S: ≦ 0.005% N: 0.05-0.30% Ni: 25-60% Cr: 22.5-40% Mo: 0-3.5% (excl.) W: 0-7% (excl.) Cr (%) + 10Mo (%) + 5W (%) ≦ 50%, 1.0% ≦ Mo (%) + 1/2W (%) < 3.5% Cu: 0-2.0% Co: 0-2.0% Rare earths: 0-0.10% Y: 0-0.20% Mg: 0-0.10% Ca: 0-0.10% one or more of Nb, Ti, Ta, Zr and V in the total amount of 0.5-4.0% Fe and incidental impurities: balance. ______________________________________

Claim 19

Dependent Claim 20 words

An alloy as defined in claim 14, in which the nickel content is 35-60% and the chromium content is 24-35%.

Claim 20

Dependent Claim 17 words

An alloy as defined in claim 14, in which the sulfur content is not more than 0.0007%.

Claim 21

Dependent Claim 20 words

An alloy as defined in claim 14, 15 or 16, in which the phosphorous content is not more than 0.003%.

Claim 22

Dependent Claim 14 words

An alloy as defined in claim 17, in which the N content is 0.10-0.25%.

Claim 23

Dependent Claim 105 words

An alloy for use in manufacturing high strength deep well casinng and tubing having improved resistance to stress corrosion cracking, the alloy composition consisting essentially of: ______________________________________ C: ≦ 0.1% Si: ≦ 1.0% Mn: ≦ 2.0% P: ≦ 0.030% S: ≦ 0.005% N: 0.05-0.30% Ni: 25-60% Cr: 22.5-40% Mo: 0-3.5% (excl.) W: 0-7% (excl.) Cr (%) + 10Mo (%) + 5W (%) ≦ 50%, 1.0% ≦ Mo (%) + 1/2W (%) < 3.5% Cu: 0-2.0% Co: 0-2.0% Rare earths: 0-0.10% Y: 0-0.20% Mg: 0-0.10% Ca: 0-0.10% one or more of Nb and V in the total amount of 0.5-4.0% Fe and incidental impurities: balance. ______________________________________

Claim 24

Dependent Claim 105 words

Claim 25

Dependent Claim 20 words

An alloy as defined in claim 19, in which the nickel content is 35-60% and the chromium content is 24-35%.

Claim 26

Dependent Claim 17 words

An alloy as defined in claim 19, in which the sulfur content is not more than 0.0007%.

Claim 27

Dependent Claim 20 words

An alloy as defined in claim 19, 20 or 21 in which the phosphorous content is not more than 0.003%.

Claim 28

Dependent Claim 14 words

An alloy as defined in claim 22, in which the N content is 0.10-0.25%.

References Cited (Backward Citations)

US2955934A Cited

US3876423A Cited

US4095976A Cited

US4119456A Cited

US4174213A Cited

US4168188A Cited

US4171217A Cited

US4245698A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-08-22	1987-02-21	1987-08-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-08-22	1991-02-21	1991-08-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-08-22	1995-02-21	1995-08-23	$7700.00	Window Closed / Lapsed

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