US4788036A — Corrosion resistant high-strength nickel-base all…

Claim 1

Independent Claim 104 words

A nickel-base alloy characterized by good workability and fabricability and further characterized in both the cold-rolled and aged conditions by high strength, good ductility and resistance to pitting, hydrogen embrittlement and stress-corrosion cracking said alloy consisting essentially of, in weight percent, about 15 to 25% chromium, about 5 to about 15% iron, about 6.5 to 9% molybdenum, about 2.5 to 5% columbium, from 0.5 to 2.5% titanium with the proviso that when the titanium is less than 1% the columbium is at least 3.5%, up to about 0.5% aluminum and the balance nickel with nickel constituting about 50 to about 60% of the alloy.

Claim 2

Dependent Claim 104 words

A nickel-base alloy characterized by good workability and fabricability and further characterized in both the cold-rolled and aged conditions by high strength, good ductility and resistance to pitting, hydrogen embrittlement and stress-corrosion cracking said alloy consisting essentially of, in weight percent, about 15 to 25% chromium, about 5 to about 15% iron, about 6.5 to 9% molybdenum, about 2.5 to 5% columbium, from 0.5 to 2.5% titanium with the proviso that when the titanium is less than 1% the columbium is at least 3.5%, up to about 0.5% aluminum and the balance nickel with nickel constituting about 50 to about 60% of the alloy.

Claim 3

Dependent Claim 77 words

An alloy as set forth in claim 1 wherein the nickel content is at least about 52%, the chromium content is at least about 18.5%, the molybdenum and columbium are correlated such that when the molybdenum content exceeds about 7% the columbium content is not greater than about 4%, the titanium is about 1 to 2.5%, and any Laves phase does not exceed about 5% as determined by the following relationship: LN(%Laves)=-2.408-0.01881 (%Ni×% Cb)+0.00929 (%Fe×% Mo)+0.2075 (%Mo×%Cb).

Claim 4

Dependent Claim 70 words

An alloy set forth in claim 2 wherein the nickel is about 54 to 58%, the chromium is about 18.5 and up to about 22%, the molybdenum is at least 7%, the sum of the chromium plus molybdenum is at least about 27%, the titanium content is from 1 to 2%, the columbium content is 3 to 4.5% and the sum of the molybdenum plus columbium is at least 10%.

Claim 5

Dependent Claim 44 words

An alloy as set forth in claim 3 in which the percentages of titanium and columbium are correlated in accordance with the relationship of %Ti+1/2%Cb is equal to at least 3% but is not greater than 4% and aluminum is about 0.05 to 0.3%.

Claim 6

Dependent Claim 35 words

An alloy as set forth in claim 2 in which the presence of any carbon, silicon, manganese and boron does not exceed about 0.1% carbon, about 0.35% silicon, about 0.5% manganese and about 0.01% boron.

Claim 7

Dependent Claim 48 words

An alloy as set forth in claim 1 in which any Laves phase does not exceed about 5% as determined by the following relationship: LN (%Laves)=-2.408-0.01881 (%Ni×%Cb)+0.00929 (%Fe×%Mo)+0.2075 (%Mo×%Cb) and wherein the nickel, molybdenum, chromium and columbium are correlated to satisfy the following relationship: % Ni 3.3 (%Mo+%Cr+2Cb)-71.

Claim 8

Dependent Claim 28 words

As an article of manufacture, a product selected from gas and/or oil well tubing, packers, hangers and valves and formed from the alloy set forth in claim 3.

Claim 9

Dependent Claim 94 words

A nickel-chromium-iron base alloy characterized by good workability and fabricability and further characterized in the aged condition by high strength, good ductility and resistance to pitting, hydrogen embrittlement and stress-corrosion cracking, said alloy consisting essentially of about 15% to 22% chromium, about 10% to 28% iron, about 6% to 9% molybdenum, about 2.5% to 5% columbium, about 1% to about 2% titanium, about 0.05% to about 0.5% aluminum and the balance essentially nickel in a weight proportion of about 45% to about 55% of said alloy, said alloy being devoid of deleterious Laves phase.

Claim 10

Dependent Claim 94 words

A nickel-chromium-iron base alloy characterized by good workability and fabricability and further characterized in the aged condition by high strength, good ductility and resistance to pitting, hydrogen embrittlement and stress-corrosion cracking, said alloy consisting essentially of about 15% to 22% chromium, about 10% to 28% iron, about 6% to 9% molybdenum, about 2.5% to 5% columbium, about 1% to about 2% titanium, about 0.05% to about 0.5% aluminum and the balance essentially nickel in a weight proportion of about 45% to about 55% of said alloy, said alloy being devoid of deleterious Laves phase.

Claim 11

Dependent Claim 35 words

An alloy as set forth in claim 8 wherein the amounts of titanium and columbium are in accordance with the relationship of Ti plus 1/2 (%Cb) equal at least 3% and no greater than 4%.

Claim 12

Dependent Claim 31 words

An alloy as set forth in claim 8 wherein the presence of carbon, silicon, manganese and boron is restricted not to exceed 0.1% carbon, 0.35% silicon, 0.35% manganese, and 0.01% boron.

Claim 13

Dependent Claim 28 words

An alloy as set forth in claim 9 containing 18.5% to 20.5% chromium, 13.5% to 18% iron and 6.5% to 7.5% molybdenum and about 1.3 to 1.7% titanium.

Claim 14

Dependent Claim 13 words

A cold worked metal article comprising the alloy set forth in claim 8.

Claim 15

Dependent Claim 53 words

A manufactured metal article comprising the alloy set forth in claim 8 in the condition resulting from cold working and aging the alloy at a temperature of about 1100° F. to 1500° F. and characterized by a yield strength of at least about 150,000 psi and an elongation of at least about 8%.

Claim 16

Dependent Claim 31 words

As a new article of manufacture, an oil or gas well tube for use in deep sour gas or oil wells and formed from the alloy set forth in claim 9.

Claim 17

Dependent Claim 100 words

A nickel-chromium-iron base alloy characterized by good workability and fabricability and further characterized in the aged condition by high strength, good ductility and resistance in pitting, hydrogen embrittlement and stress-corrosion cracking, said alloy consisting essentially of from 15% to about 25% chromium, about 5% to about 15% iron, about 6.5% to 9% molybdenum, about 2.5 to 5% columbium, from 0.5 to 2.5% titanium, with the proviso that when the titanium is below 1% the columbium is at least 3.5%, up to about 0.5% aluminum and the balance nickel, the nickel being from about 45% to about 55% of said alloy.

Claim 18

Dependent Claim 100 words

A nickel-chromium-iron base alloy characterized by good workability and fabricability and further characterized in the aged condition by high strength, good ductility and resistance in pitting, hydrogen embrittlement and stress-corrosion cracking, said alloy consisting essentially of from 15% to about 25% chromium, about 5% to about 15% iron, about 6.5% to 9% molybdenum, about 2.5 to 5% columbium, from 0.5 to 2.5% titanium, with the proviso that when the titanium is below 1% the columbium is at least 3.5%, up to about 0.5% aluminum and the balance nickel, the nickel being from about 45% to about 55% of said alloy.

Claim 19

Dependent Claim 26 words

The alloy set forth in claim 15 and containing about 18.5 to 25% chromium, about 2.5 to 4.5% columbium, and being devoid of detrimental Laves phase.

Claim 20

Dependent Claim 14 words

The alloy set forth in claim 16 and containing up to about 0.25% aluminum.

Claim 21

Dependent Claim 29 words

As a new article of manufacture, a product selected from oil and/or gas well tubing, packers, hangers and valves and formed from the alloy set forth in claim 16.

Claim 22

Dependent Claim 150 words

A nickel-base alloy characterized by good workability and fabricability and further characterized in both the cold-rolled and aged conditions by high strength, good ductility and resistance to pitting, hydrogen embrittlement and stress corrosion cracking, said alloy consisting essentially of, in weight percent, about 18.5 to about 22% chromium, from 5 to 15% iron, from 6.5 to 9% molybdenum, from 3 to 4.5% columbium, the molybdenum and columbium being correlated such that when the molybdenum exceeds 7% the columbium is not greater than about 4%, about 1 to 2.5% titanium, up to 0.5% aluminum and about 52 to less than 60% nickel in which the nickel, molybdenum, chromium and columbium are correlated to satisfy the following relationship: % Ni≧3.3(% Mo+% Cr+2% Cb)-71 and in which any Laves phase does not exceed about 5% as determined by the following relationship: LN (% Laves)=-2.408-0.01881 (% Ni+% Cb)+0.00929 (% Fe×% Mo)+0.2075 (% Mo×% Cb).

Claim 23

Dependent Claim 150 words

A nickel-base alloy characterized by good workability and fabricability and further characterized in both the cold-rolled and aged conditions by high strength, good ductility and resistance to pitting, hydrogen embrittlement and stress corrosion cracking, said alloy consisting essentially of, in weight percent, about 18.5 to about 22% chromium, from 5 to 15% iron, from 6.5 to 9% molybdenum, from 3 to 4.5% columbium, the molybdenum and columbium being correlated such that when the molybdenum exceeds 7% the columbium is not greater than about 4%, about 1 to 2.5% titanium, up to 0.5% aluminum and about 52 to less than 60% nickel in which the nickel, molybdenum, chromium and columbium are correlated to satisfy the following relationship: % Ni≧3.3(% Mo+% Cr+2% Cb)-71 and in which any Laves phase does not exceed about 5% as determined by the following relationship: LN (% Laves)=-2.408-0.01881 (% Ni+% Cb)+0.00929 (% Fe×% Mo)+0.2075 (% Mo×% Cb).

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-11-29	1992-05-30	1992-11-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-11-29	1996-05-30	1996-11-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-11-29	2000-05-30	2000-11-29	$7700.00	Window Closed / Lapsed

Corrosion resistant high-strength nickel-base alloy

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag