Patent US2572191A successfully refreshed from Google Patents.
US2572191A
Expired / Lapsed
US
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Alloy steel having high strength at elevated temperature
Assignee: Crucible Steel Company of America
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Filing: 1949-12-16
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Granted: 1951-10-23
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Expires: 1969-12-16
Abstract
No abstract record available.
Inventors
- 👤 Payson Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:37
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A FORGEABLE, FERRITIC, ALLOY STEEL OF HIGH HARDENABILITY, AND WHICH AS AIR COOLED FROM ABOUT 2100* F. IN SECTIONS UP TO ABOUT 1 INCH IN DIAMETER, ATTAINS A HARDNESS OF AT LEAST ROCKWELL "C" 25, AND WHICH ON BEING SO HARDENED AND THEREAFTER TEMPERED AT ABOUT 1100 TO 1200* F., IS CHARACTERIZED IN POSSESSING HIGH STRENGTH AT BOTH ROOM AND ELEVATED TEMPERATURES, AND IN HAVING A 1000 HOUR, STRESS-RUPTURE VALUE AT 1100* F. OF AT LEAST 40,000 POUNDS PER SQUARE INCH, SAID STEEL HAVING SUBSTANTIALLY THE FOLLOWING COMPOSITION: 0.03 TO 0.3% CARBON; 0.15 TO 2% VANADIUM, THE MINIMUM VANADIUM CONTENT BEING FROM ABOUT 3 TO 5 TIMES THE CARBON CONTENT: 1 TO 6% CHROMIUM; 0.3 TO 3% OF METAL OF THE GROUP MOLYBDENUM AND TUNGSTEN; 0.005 TO 0.1% BORON; 0.2 TO 2% MANGANESE; 0.1 TO 2% SILICON; UP TO ABOUT 5% IN AGGREGATE OF OTHER ELEMENTS WHICH DO NOT IMPAIR THE AFORESAID PROPERTIES OF THE STEEL; AND THE BALANCE IRON.
Claim 2
Dependent Claim
160 words
A FORGEABLE, FERRITIC, ALLOY STEEL OF HIGH HARDENABILITY, AND WHICH AS AIR COOLED FROM ABOUT 2100* F. IN SECTIONS UP TO ABOUT 1 INCH IN DIAMETER, ATTAINS A HARDNESS OF AT LEAST ROCKWELL "C" 25, AND WHICH ON BEING SO HARDENED AND THEREAFTER TEMPERED AT ABOUT 1100 TO 1200* F., IS CHARACTERIZED IN POSSESSING HIGH STRENGTH AT BOTH ROOM AND ELEVATED TEMPERATURES, AND IN HAVING A 1000 HOUR, STRESS-RUPTURE VALUE AT 1100* F. OF AT LEAST 40,000 POUNDS PER SQUARE INCH, SAID STEEL HAVING SUBSTANTIALLY THE FOLLOWING COMPOSITION: 0.03 TO 0.3% CARBON; 0.15 TO 2% VANADIUM, THE MINIMUM VANADIUM CONTENT BEING FROM ABOUT 3 TO 5 TIMES THE CARBON CONTENT: 1 TO 6% CHROMIUM; 0.3 TO 3% OF METAL OF THE GROUP MOLYBDENUM AND TUNGSTEN; 0.005 TO 0.1% BORON; 0.2 TO 2% MANGANESE; 0.1 TO 2% SILICON; UP TO ABOUT 5% IN AGGREGATE OF OTHER ELEMENTS WHICH DO NOT IMPAIR THE AFORESAID PROPERTIES OF THE STEEL; AND THE BALANCE IRON.
References Cited (Backward Citations)
US1959398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |