US3902899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Austenitic castable high temperature alloy
Assignee: Cyprus Amax Minerals Co
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Filing: 1974-05-13
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Granted: 1975-09-02
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Expires: 1994-05-13
Abstract
Abstract An austenitic castable high temperature alloy having improved high temperature strength coupled with good corrosion resistance and ductility in the as-cast condition and comprising about 16 to about 22% chromium; about 6 to about 18% nickel; about 6 to about 10% molybdenum, up to about 3% tungsten; about 0.5 to about 2.5% boron; about 0.01 to about 0.4% carbon; about 0.15 to about 7% manganese; up to about 3% silicon; from zero to about 1% niobium; and the balance substantially all iron together with normal residuals and incidental impurities present in usual amounts.
Inventors
- 👤 David L Sponseller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:03
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/54; C22C38/44; C22C38/58
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
AN AUSTENITIC CASTABLE HIGH TEMPERATURE ALLOY CONSISTING ESSENTIALLY OF ABOUT 16 TO ABOUT 22% CHROIUM, ABOUT 6 TO ABOUT 18% NICKEL, ABOUT 6 TO ABOUT 10% MOLYBDENUM, UP TO ABOUT 3% TUNGSTEN, AND ABOUT 0.5 TO ABOUT 2.5% BORON, ABOUT 0.01 TO ABOUT 0.4% CARBON, ABOUT 0.15 TO ABOUT 7% MAGANESE, UP TO ABOUT 3% SILICON, FROM ZERO TO ABOUT 1% NIOBIUM AND THE BALANCE SUBSTANTIALLY ALL IRON TOGEHTER WITH NORMAL RESIDUALS AND INCIDENTAL IMPURITIES PRESENT IN USUAL AMOUNTS, SAID ALLOY FURTHER CHARACTERIZED AS HAVING A 100-HOUR RUPTURE STRENGTH AT 1,500*F OF AT LEAST 25 KSI.
Claim 2
Dependent Claim
96 words
AN AUSTENITIC CASTABLE HIGH TEMPERATURE ALLOY CONSISTING ESSENTIALLY OF ABOUT 16 TO ABOUT 22% CHROIUM, ABOUT 6 TO ABOUT 18% NICKEL, ABOUT 6 TO ABOUT 10% MOLYBDENUM, UP TO ABOUT 3% TUNGSTEN, AND ABOUT 0.5 TO ABOUT 2.5% BORON, ABOUT 0.01 TO ABOUT 0.4% CARBON, ABOUT 0.15 TO ABOUT 7% MAGANESE, UP TO ABOUT 3% SILICON, FROM ZERO TO ABOUT 1% NIOBIUM AND THE BALANCE SUBSTANTIALLY ALL IRON TOGEHTER WITH NORMAL RESIDUALS AND INCIDENTAL IMPURITIES PRESENT IN USUAL AMOUNTS, SAID ALLOY FURTHER CHARACTERIZED AS HAVING A 100-HOUR RUPTURE STRENGTH AT 1,500*F OF AT LEAST 25 KSI.
Claim 3
Dependent Claim
110 words
The austenitic castable high temperature alloy as defined in claim 1, in which chromium is present in an amount of about 17 to about 20%, nickel is present in an amount of about 8 to about 14%, molybdenum is present in an amount of about 7 to about 9%, boron is present in an amount of about 0.6 to about 1.3%, carbon is present in an amount of about 0.05 to about 0.25%, manganese is present in an amount of about 0.5 to about 5%, silicon is present in an amount of about 0.15 to about 1%, and niobium is present in an amount of about 0.2 to about 0.7%.
Claim 4
Dependent Claim
86 words
The austenitic castable high temperature alloy as defined in claim 1, in which chromium is present in an amount of about 18%, nickel is present in an amount of about 12%, molybdenum is present in an amount of about 8%, boron is present in an amount of about 1%, carbon is present in an amount of about 0.2%, manganese is present in an amount of about 1%, silicon is present in an amount of about 0.5% and niobium is present in an amount of about 0.5%.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |