High strength corrosion resistant alloy
First Claim
1. An age hardenable-corrosion resistant alloy consisting essentially of by weight percent, about 25 to 35 nickel, about 19 to 24 chromium, about 1.5 to 7 molybdenum, about 1.5 to 3.5 titanium, less than about 0.4 aluminum, about 0.002 to 0.2 carbon, less than about 1.2 niobium, less than about 5 manganese, less than about 1 copper, less than about 2 cobalt, less than about 0.05 total calcium, cerium and magnesium, about 0 to 0.005 boron and balance iron and incidental impurities and deoxidizers;
- and said alloy passing a slow strain rate corrosion test by maintaining a ratio of at least 0.70 for time to failure, percent reduction in area and elongation for sour brine conditions of 15% NaCl, 0.435 psi H2 S, 700 psi CO2, pH 4.0 and a temperature of 194°
F.
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Accused Products
Abstract
The alloy consists of an age hardenable-corrosion resistant alloy useful for oil and gas applications that require resistance to low-level sour gas conditions. This alloy contains, by weight percent, 20 to 36 nickel, 18 to 25 chromium, 1 to 8 molybdenum, 1.2 to 4 titanium, less than 0.5 aluminum, 0.001 to 0.5 carbon, less than 1.5 niobium, less than 10 manganese, less than 5 copper, less than 4 cobalt, less than 0.1 total calcium, cerium and magnesium, 0 to 0.01 boron and balance iron and incidental impurities and deoxidizers.
40 Citations
6 Claims
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1. An age hardenable-corrosion resistant alloy consisting essentially of by weight percent, about 25 to 35 nickel, about 19 to 24 chromium, about 1.5 to 7 molybdenum, about 1.5 to 3.5 titanium, less than about 0.4 aluminum, about 0.002 to 0.2 carbon, less than about 1.2 niobium, less than about 5 manganese, less than about 1 copper, less than about 2 cobalt, less than about 0.05 total calcium, cerium and magnesium, about 0 to 0.005 boron and balance iron and incidental impurities and deoxidizers;
- and said alloy passing a slow strain rate corrosion test by maintaining a ratio of at least 0.70 for time to failure, percent reduction in area and elongation for sour brine conditions of 15% NaCl, 0.435 psi H2 S, 700 psi CO2, pH 4.0 and a temperature of 194°
F. - View Dependent Claims (2, 3, 4)
- and said alloy passing a slow strain rate corrosion test by maintaining a ratio of at least 0.70 for time to failure, percent reduction in area and elongation for sour brine conditions of 15% NaCl, 0.435 psi H2 S, 700 psi CO2, pH 4.0 and a temperature of 194°
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5. An age hardenable-corrosion resistant alloy consisting essentially of, by weight percent, about 26 to 34 nickel, about 20 to 23 chromium, about 1.8 to 6 molybdenum, about 1.7 to 3 titanium, less than about 0.3 aluminum, about 0.005 to 0.1 carbon, less than about 1 niobium, less than about 2 manganese, less than about 1 copper, less than about I cobalt, less than about 0.01 total calcium, cerium and magnesium, about 0 to 0.001 boron and balance iron and incidental impurities and deoxidizers;
- and said alloy passing a slow strain rate corrosion test by maintaining a ratio of at least 0.70 for time to failure, percent reduction in area and elongation for sour brine conditions of 15% NaCl, 0.435 psi H2 S, 700 psi CO2, pH 4.0 and a temperature of 194°
F. - View Dependent Claims (6)
- and said alloy passing a slow strain rate corrosion test by maintaining a ratio of at least 0.70 for time to failure, percent reduction in area and elongation for sour brine conditions of 15% NaCl, 0.435 psi H2 S, 700 psi CO2, pH 4.0 and a temperature of 194°
Specification
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- Resources
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Current AssigneeHuntington Alloys Corporation (Berkshire Hathaway Incorporated)
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Original AssigneeInco Alloys International, Inc. (Berkshire Hathaway Incorporated)
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InventorsCorn, Rickey Dale, Hibner, Edward Lee, Mankins, William Lawrence
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Primary Examiner(s)Yee, Deborah
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Application NumberUS09/178,463Time in Patent Office312 DaysField of Search420/586, 420/586.1, 420/44-49, 420/53US Class Current420/586CPC Class CodesC21D 6/001 containing Ni C21D6/004 tak...C21D 6/02 Hardening by precipitationC22C 30/00 Alloys containing less than...C22C 38/40 with nickelC22C 38/44 with molybdenum or tungstenC22C 38/50 with titanium or zirconium
