Patent US4795610A successfully refreshed from Google Patents.
US4795610A
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US
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Corrosion resistant alloy
Assignee: Carondelet Foundry Co
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Filing: 1987-04-23
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Granted: 1989-01-03
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Expires: 2007-04-23
Abstract
Abstract An air-meltable, castable, weldable, non-magnetic alloy resistant to corrosion in chloride-containing fluids as well as in many other corrosive streams. The alloy consists essentially of between about 20.7% and about 27.2% by weight nickel, between about 19.3% and about 22.7% by weight chromium, between about 0.94% and about 2% by weight molybdenum, between about 2.6% and about 3.2% by weight copper, between about 3.2% and about 4.2% by weight manganese, between about 0.27% and about 2.02% niobium, between about 0.10% and about 0.25% by weight nitrogen, up to about 0.08% by weight carbon, up to about 0.9% by weight silicon, up to about 0.7% by weight titanium, up to about 1% by weight vanadium, up to about 0.6% by weight of a rare earth component selected from the group consisting of cerium, lanthanum, and misch metal, up to about 1% by weight cobalt, and the balance essentially iron. The sum of the nickel and cobalt contents should be between about 21.7% and about 27.2% by weight.
Inventors
- 👤 John H. Culling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:36
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
An air-meltable, castable, weldable, non-magnetic alloy having a single phase austenitic structure and resistant to corrosion in chloride containing fluids, consisting essentially of between about 20.7% and about 27.2% by weight nickel, between about 19.3% and about 22.7% by weight chromium, between about 0.94% and about 2% by weight molybdenum, between about 2.6% and about 3.2% by weight copper, between about 3.2% and about 4.2% by weight manganese, between about 0.27% and about 2.02% by weight niobium, between about 0.10% and about 0.25% by weight nitrogen, up to about 0.08% by weight carbon, up to about 0.9% by weight silicon, up to about 0.7% by weight titanium, up to about 1% by weight vanadium, up to about 0.6% by weight of a rare earth component selected from the group consisting of cerium, lanthanum, and misch metal, up to about 1% by weight cobalt, and the balance essentially iron, the sum of the nickel content and cobalt content being between about 21.7% and about 27.2% by weight.
Claim 2
Dependent Claim
166 words
An air-meltable, castable, weldable, non-magnetic alloy having a single phase austenitic structure and resistant to corrosion in chloride containing fluids, consisting essentially of between about 20.7% and about 27.2% by weight nickel, between about 19.3% and about 22.7% by weight chromium, between about 0.94% and about 2% by weight molybdenum, between about 2.6% and about 3.2% by weight copper, between about 3.2% and about 4.2% by weight manganese, between about 0.27% and about 2.02% by weight niobium, between about 0.10% and about 0.25% by weight nitrogen, up to about 0.08% by weight carbon, up to about 0.9% by weight silicon, up to about 0.7% by weight titanium, up to about 1% by weight vanadium, up to about 0.6% by weight of a rare earth component selected from the group consisting of cerium, lanthanum, and misch metal, up to about 1% by weight cobalt, and the balance essentially iron, the sum of the nickel content and cobalt content being between about 21.7% and about 27.2% by weight.
Claim 3
Dependent Claim
18 words
An alloy is set forth in claim 1 containing between about 35% and about 51% by weight iron.
Claim 4
Dependent Claim
103 words
An alloy as set forth in claim 1 containing between about 21% and about 26% by weight nickel, between about 19.3% and about 22% by weight chromium, between about 1.1% and about 1.9% by weight molybdenum, between about 2.8% and about 3.2% by weight copper, between about 3.2% and about 4% by weight manganese, between 0.5% and about 1.5% by weight niobium, between about 0.10% and about 0.25% by weight nitrogen, up to about 0.5% by weight silicon, and up to about 0.08% by weight carbon, the sum of the nickel content and the cobalt content being at least about 22% by weight.
Claim 5
Dependent Claim
103 words
An alloy as set forth in claim 3 containing between about 22% and 25% by weight nickel, between about 19.5% and 21% by weight chromium, between about 1.3% and about 1.9% by weight molybdenum, between about 2.8% and 3.2% by weight copper, between about 3.2% and about 3.8% by weight manganese, between 0.5% and 0.8% by weight niobium, between about 0.15% and about 0.20% by weight nitrogen, between about 0.10% and about 0.45% by weight silicon, and between about 0.01% and about 0.05% by weight carbon, the sum of the nickel content and the cobalt content being at least about 23% by weight.
Claim 6
Dependent Claim
77 words
An air-meltable, castable, weldable, non-magnetic alloy resistant to corrosion in chloride containing fluids, consisting essentially of between about 23% and about 24% by weight nickel, approximately 20.5% by weight chromium, approximately 1.8% by weight molybdenum, approximately 3% by weight copper, approximately 3.5% by weight manganese, approximately 0.6% by weight niobium, approximately 0.15% by weight nitrogen, approximately 0.35% by weight silicon, approximately 0.03% by weight carbon, up to about 1% by weight cobalt, and the balance essentially iron.
Claim 7
Dependent Claim
77 words
An air-meltable, castable, weldable, non-magnetic alloy resistant to corrosion in chloride containing fluids, consisting essentially of between about 23% and about 24% by weight nickel, approximately 20.5% by weight chromium, approximately 1.8% by weight molybdenum, approximately 3% by weight copper, approximately 3.5% by weight manganese, approximately 0.6% by weight niobium, approximately 0.15% by weight nitrogen, approximately 0.35% by weight silicon, approximately 0.03% by weight carbon, up to about 1% by weight cobalt, and the balance essentially iron.
Claim 8
Dependent Claim
24 words
An alloy as set forth in claim 5 wherein the sum of the nickel content and the cobalt content is approximately 24% by weight.
Claim 9
Dependent Claim
17 words
An alloy as set forth in claim 6 wherein the nickel content is approximately 24% by weight.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |