US3993475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resisting alloys
Assignee: Duraloy Co
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Filing: 1975-04-18
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Granted: 1976-11-23
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Expires: 1995-04-18
Abstract
Abstract A new alloy is provided having high creep strength at elevated temperatures in the range 1100 DEG to 1200 DEG C. and which is unusually resistant to corrosion and thermal shock and has unusual stress rupture characteristics at the elevated temperatures here involved consisting essentially of, by weight, about 0.3% to 0.9% carbon, 20% to 30% chromium, 26% to 40% nickel, 0.8% to 4.0% manganese, 0.9% to 3.5% silicon, 0.3% to 5.0% tungsten, 3.5% to 8.5% cobalt and the balance iron with residual impurities in ordinary amounts.
Inventors
- 👤 Kohsaburo Harada
- 👤 Yousuke Matsumoto
- 👤 Rokurou Kiyoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:38
CPC Classifications
C; C22; C22C; C22C30/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
An alloy characterized by high creep strength at elevated temperatures in the range 1,100° C. to 1,200° C., by resistance to corrosion, particularly in the form of oxidation, by resistance to thermal shock and by unusual stress rupture characteristics at elevated temperatures consisting of, by weight, about 0.3% to 0.9% carbon, about 20% to 30% chromium, about 26% to 40% nickel, about 0.8% to 4.0% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5.0% tungsten, about 3.5% to 8.5% cobalt and the balance iron with residual impurities in ordinary amounts.
Claim 2
Dependent Claim
91 words
An alloy characterized by high creep strength at elevated temperatures in the range 1,100° C. to 1,200° C., by resistance to corrosion, particularly in the form of oxidation, by resistance to thermal shock and by unusual stress rupture characteristics at elevated temperatures consisting of, by weight, about 0.3% to 0.9% carbon, about 20% to 30% chromium, about 26% to 40% nickel, about 0.8% to 4.0% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5.0% tungsten, about 3.5% to 8.5% cobalt and the balance iron with residual impurities in ordinary amounts.
Claim 3
Dependent Claim
14 words
An alloy as claimed in claim 1 having 0.3% to 2.5% by weight niobium.
Claim 4
Dependent Claim
107 words
An alloy article for use at elevated temperatures in the range 1,100° to 1,200° C. made from an alloy characterized by high creep strength at elevated temperatures in the range 1,100° to 1,200° C., by resistance to corrosion, particularly in the form of oxidation, by resistance to thermal shock and by unusual stress rupture characteristics at elevated temperatures consisting of, by weight, about 0.3% to 0.9% carbon, about 20% to 30% chromium, about 26% to 40% nickel, about 0.8% to 4.0% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5.0% tungsten, about 3.5% to 8.5% cobalt and the balance iron with residual impurities in ordinary amounts.
Claim 5
Dependent Claim
107 words
An alloy article for use at elevated temperatures in the range 1,100° to 1,200° C. made from an alloy characterized by high creep strength at elevated temperatures in the range 1,100° to 1,200° C., by resistance to corrosion, particularly in the form of oxidation, by resistance to thermal shock and by unusual stress rupture characteristics at elevated temperatures consisting of, by weight, about 0.3% to 0.9% carbon, about 20% to 30% chromium, about 26% to 40% nickel, about 0.8% to 4.0% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5.0% tungsten, about 3.5% to 8.5% cobalt and the balance iron with residual impurities in ordinary amounts.
Claim 6
Dependent Claim
15 words
An alloy article as claimed in claim 3 containing 0.3% to 2.5% by weight niobium.
Claim 7
Dependent Claim
107 words
A structural member for use at elevated temperature in the range 1,100° to 1,200° C. made from an alloy characterized by high creep strength at elevated temperatures in the range 1,100° to 1,200° C., by resistance to corrosion, particularly in the form of oxidation, by resistance to thermal shock and by unusual stress rupture characteristics at elevated temperatures consisting of, by weight, about 0.3% to 0.9% carbon, about 20% to 30% chromium, about 26% to 40% nickel, about 0.8% to 4.0% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5.0% tungsten, about 3.5% to 8.5% cobalt and the balance iron with residual impurities in ordinary amounts.
Claim 8
Dependent Claim
107 words
A structural member for use at elevated temperature in the range 1,100° to 1,200° C. made from an alloy characterized by high creep strength at elevated temperatures in the range 1,100° to 1,200° C., by resistance to corrosion, particularly in the form of oxidation, by resistance to thermal shock and by unusual stress rupture characteristics at elevated temperatures consisting of, by weight, about 0.3% to 0.9% carbon, about 20% to 30% chromium, about 26% to 40% nickel, about 0.8% to 4.0% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5.0% tungsten, about 3.5% to 8.5% cobalt and the balance iron with residual impurities in ordinary amounts.
Claim 9
Dependent Claim
15 words
A structural member as claimed in claim 5 containing 0.3% to 2.5% by weight niobium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |