US3266947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat treating alloy steel rotor forgings
Assignee: United States Steel Corp
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Filing: 1963-09-03
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Granted: 1966-08-16
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Expires: 1983-09-03
Abstract
No abstract record available.
Inventors
- 👤 John E Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:06
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF PRODUCING LARGE ROTOR FORGINGS CAMPRISING FORGING A ROTOR FROM STEEL CONTAINING ESSENTIALLY IRON AND CARBON .15/.30% MANGANESE .15/.80 SILICON .40 MAX. NICKEL 1.50/4.25 CHROMIUM 2.00 MAX. MOLYBDENUM .20/.70 VANADIUM .30 MAX. AIR COOLING SAID FORGING AFTER THE FORGING OPERATION, AUSTENITIZING IT AT A TEMPERATURE OF 1475 TO 1525*C. AND HOLD AT SUCH TEMPRATURE FOR AT LEAST ABOUT 30 HOURS, COOL TO ROOM TEMPERATURE, TEMPER AT A TEMPERATURE BETWEEN 1025 AND 1175*F. FOR AT LEAST ABOUT 30 HOURS AND THEREAFTER SLOW COOL TO ROOM TEMPERATURE.
Claim 2
Independent Claim
87 words
A METHOD OF PRODUCING LARGE ROTOR FORGINGS CAMPRISING FORGING A ROTOR FROM STEEL CONTAINING ESSENTIALLY IRON AND CARBON .15/.30% MANGANESE .15/.80 SILICON .40 MAX. NICKEL 1.50/4.25 CHROMIUM 2.00 MAX. MOLYBDENUM .20/.70 VANADIUM .30 MAX. AIR COOLING SAID FORGING AFTER THE FORGING OPERATION, AUSTENITIZING IT AT A TEMPERATURE OF 1475 TO 1525*C. AND HOLD AT SUCH TEMPRATURE FOR AT LEAST ABOUT 30 HOURS, COOL TO ROOM TEMPERATURE, TEMPER AT A TEMPERATURE BETWEEN 1025 AND 1175*F. FOR AT LEAST ABOUT 30 HOURS AND THEREAFTER SLOW COOL TO ROOM TEMPERATURE.
References Cited (Backward Citations)
US2992148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |