Patent US3859082A successfully refreshed from Google Patents.
US3859082A
Expired / Lapsed
US
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Wrought austenitic alloy products
Assignee: Armco Inc
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Filing: 1972-02-29
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Granted: 1975-01-07
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Expires: 1992-02-29
Abstract
Abstract Wrought alloy products for use in the chemical and food industries, more particularly tubular products such as condenser tubing, super-heater tubing, sheathing for heating elements, and the like. The products are fashioned by extrusion, piercing or other processing from an austenitic chromium-nickel-iron alloy possessing a combination of good hot-workability and good weldability. The wrought products are characterized by a combination of good resistance to intergranular corrosion and excellent resistance to stress-corrosion cracking, even in the presence of chlorides. The alloy, in addition to iron, contains chromium in the amount of 15% to 25%, nickel in amount greater than 25% but less than 35%, manganese 3% to 12%, carbon .06% to .30% with the minimum carbon requirement increasing with descending nickel contents.
Inventors
- 👤 Jr Elbert E Denhard
- 👤 Robert R Gaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:15
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
52 words
WROUGHT AUSTENITIC CHROMIUM-NICKEL-IRON ALLOY TUBULAR PRODUCT CHARACTERIZED BY A COMBINATION OF WORKABILITY, RESISTANCE TO STRESS-CORROSION CRACKING AND TO INTERGRANULAR ATTACK UNDER STRESS AT ELEVATED TEMPERATURES AND ESSENTIALLY CONSISTING OF ABOUT 24% CHROMIUM, ABOUT 34% NICKEL, ABOUT 5% MANGANESE, ABOUT .1% CARBON, ABOUT 2% MOLYBDENUM, ABOUT .5% COLUMBIUM, AND REMAINDER SUBSTANTIALLY ALL IRON.
Claim 2
Dependent Claim
52 words
WROUGHT AUSTENITIC CHROMIUM-NICKEL-IRON ALLOY TUBULAR PRODUCT CHARACTERIZED BY A COMBINATION OF WORKABILITY, RESISTANCE TO STRESS-CORROSION CRACKING AND TO INTERGRANULAR ATTACK UNDER STRESS AT ELEVATED TEMPERATURES AND ESSENTIALLY CONSISTING OF ABOUT 24% CHROMIUM, ABOUT 34% NICKEL, ABOUT 5% MANGANESE, ABOUT .1% CARBON, ABOUT 2% MOLYBDENUM, ABOUT .5% COLUMBIUM, AND REMAINDER SUBSTANTIALLY ALL IRON.
Claim 3
Dependent Claim
59 words
Wrought austenitic chromium-nickel-iron alloy product characterized by a combination of good hot-workability, weldability, freedom from resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 24% chromium, about 30% to nickel, about 4% to about 10% manganese, about .15% to about .22% carbon, with the carbon-nickel relationship being:
Claim 4
Dependent Claim
59 words
Wrought austenitic chromium-nickel-iron alloy product characterized by a combination of good hot-workability, weldability, freedom from resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 24% chromium, about 30% to nickel, about 4% to about 10% manganese, about .15% to about .22% carbon, with the carbon-nickel relationship being:
Claim 5
Dependent Claim
61 words
Wrought austenitic chromium-nickel-iron alloy product characterized by a combination of good hot-workability, weldability, freedom from resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 24% chromium, about 25.5% to about 34.5% nickel, about 3% to about 10% manganese, about .06% to about .22% carbon, with the carbon-nickel relationship being:
Claim 6
Dependent Claim
61 words
Wrought austenitic chromium-nickel-iron alloy product characterized by a combination of good hot-workability, weldability, freedom from resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 24% chromium, about 25.5% to about 34.5% nickel, about 3% to about 10% manganese, about .06% to about .22% carbon, with the carbon-nickel relationship being:
Claim 7
Dependent Claim
66 words
Austenitic chromium-nickel-iron alloy welded tubes of the character employed in elevated temperature application at high pressures characterized by a combination of resistance to stress-corrosion cracking and to intergranular attack under stress at such temperatures, essentially consisting of about 15% to about 25% chromium, about 25.5% to about 34.5% nickel, about 4% to about 12% manganese, about .06% to about .22% carbon, with the carbon-nickel relationship being:
Claim 8
Dependent Claim
66 words
Austenitic chromium-nickel-iron alloy welded tubes of the character employed in elevated temperature application at high pressures characterized by a combination of resistance to stress-corrosion cracking and to intergranular attack under stress at such temperatures, essentially consisting of about 15% to about 25% chromium, about 25.5% to about 34.5% nickel, about 4% to about 12% manganese, about .06% to about .22% carbon, with the carbon-nickel relationship being:
Claim 9
Dependent Claim
65 words
Wrought austenitic chromium-nickel-iron alloy welded tubular product characterized by a combination of workability, resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 24% chromium, about 30% to about 34.5% nickel, about 3% to about 10% manganese, about .06% to about .19% carbon, about 0.0005% to about 0.0070% boron, and remainder substantially all iron.
Claim 10
Dependent Claim
65 words
Wrought austenitic chromium-nickel-iron alloy welded tubular product characterized by a combination of workability, resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 24% chromium, about 30% to about 34.5% nickel, about 3% to about 10% manganese, about .06% to about .19% carbon, about 0.0005% to about 0.0070% boron, and remainder substantially all iron.
Claim 11
Dependent Claim
59 words
Wrought austenitic chromium-nickel-iron alloy welded tubular product characterized by a combination of workability, resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 15% to about 25% chromium, about 25.5% to about 34.5% nickel, about 4% to about 10% manganese, about .06% to about .22% carbon, with the carbon-nickel relationship being:
Claim 12
Dependent Claim
59 words
Wrought austenitic chromium-nickel-iron alloy welded tubular product characterized by a combination of workability, resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 15% to about 25% chromium, about 25.5% to about 34.5% nickel, about 4% to about 10% manganese, about .06% to about .22% carbon, with the carbon-nickel relationship being:
Claim 13
Dependent Claim
71 words
WroUght austenitic chromium-nickel-iron alloy welded tubular product characterized by a combination of workability, resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 22% chromium, about 30% to about 34.5% nickel, about 4% to about 10% manganese, about .06% to about .19% carbon, about 1% to about 3% molybdenum about 0.0005% to about 0.0070% boron, and remainder substantially all iron.
Claim 14
Dependent Claim
71 words
WroUght austenitic chromium-nickel-iron alloy welded tubular product characterized by a combination of workability, resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 22% chromium, about 30% to about 34.5% nickel, about 4% to about 10% manganese, about .06% to about .19% carbon, about 1% to about 3% molybdenum about 0.0005% to about 0.0070% boron, and remainder substantially all iron.
Claim 15
Dependent Claim
73 words
Wrought austenitic chromium-nickel-iron alloy welded tubular product such as heat exchangers, condenser tubing, super-heater tubing and sheathing for heating elements characterized by a combination of workability and resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 15% to about 25% chromium, about 25.5% to about 34.5% nickel, about 3% to about 12% manganese, about .06% to about .22% carbon, with the carbon-nickel relationship being:
Claim 16
Dependent Claim
73 words
Wrought austenitic chromium-nickel-iron alloy welded tubular product such as heat exchangers, condenser tubing, super-heater tubing and sheathing for heating elements characterized by a combination of workability and resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 15% to about 25% chromium, about 25.5% to about 34.5% nickel, about 3% to about 12% manganese, about .06% to about .22% carbon, with the carbon-nickel relationship being:
Claim 17
Dependent Claim
67 words
Wrought austenitic chromium-nickel-iron alloy sheathing for heating elements characterized by a combination of workability and resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 24% chromium, about 30% to about 34.5% nickel, about 3% to about 10% manganese, about .06% to about .19% carbon about 0.0005% to about 0.0070% boron, and remainder substantially all iron.
Claim 18
Dependent Claim
67 words
Wrought austenitic chromium-nickel-iron alloy sheathing for heating elements characterized by a combination of workability and resistance to stress-corrosion cracking and to intergranular attack under stress at elevated temperatures and essentially consisting of about 18% to about 24% chromium, about 30% to about 34.5% nickel, about 3% to about 10% manganese, about .06% to about .19% carbon about 0.0005% to about 0.0070% boron, and remainder substantially all iron.
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |