US2586041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-alloy, high-hardenability steel with high toughness at high hardness levels
Assignee: United States Steel Corp
•
Filing: 1951-04-06
•
Granted: 1952-02-19
•
Expires: 1971-04-06
Abstract
No abstract record available.
Inventors
- 👤 John M Hodge
- 👤 Richard D Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:42
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A HIGH-HARDENABILITY STEEL CHARACTERIZED BY LESS THAN 4% TOTAL ALLOY CONTENT AND LESS THAN 1% NICKEL AND TENSILE STRENGTHS IN EXCESS OF 220,000 P. S. I. AND A V-NOTCH, CHARPY-BAR IMPACT VALUE IN EXCESS OF 20 FT.-LBS. AT -100* F. AFTER HEAT TREATING BY COOLING SUFFICIENTLY RAPIDLY FROM AN AUSTENITIZING TEMPERATURE TO OBTAIN A MARTENSITIC STRUCTURE AND THEREAFTER TEMPERING WITHIN THE RANGE OF 400 TO 500* F., SAID STEEL COMPRISING .22 TO 37% MOLYBDENUM, MANGANESE, .55 TO .75% SILICON, .70 TO .95% NICKEL, .70 TO .90% CHROMIUM, .40 TO .60% MOLYBDENUM, .002 TO .006% BORON, BALANCE IRON AND RESIDUAL AMOUNTS OF OTHER ELEMENTS.
Claim 2
Dependent Claim
103 words
A HIGH-HARDENABILITY STEEL CHARACTERIZED BY LESS THAN 4% TOTAL ALLOY CONTENT AND LESS THAN 1% NICKEL AND TENSILE STRENGTHS IN EXCESS OF 220,000 P. S. I. AND A V-NOTCH, CHARPY-BAR IMPACT VALUE IN EXCESS OF 20 FT.-LBS. AT -100* F. AFTER HEAT TREATING BY COOLING SUFFICIENTLY RAPIDLY FROM AN AUSTENITIZING TEMPERATURE TO OBTAIN A MARTENSITIC STRUCTURE AND THEREAFTER TEMPERING WITHIN THE RANGE OF 400 TO 500* F., SAID STEEL COMPRISING .22 TO 37% MOLYBDENUM, MANGANESE, .55 TO .75% SILICON, .70 TO .95% NICKEL, .70 TO .90% CHROMIUM, .40 TO .60% MOLYBDENUM, .002 TO .006% BORON, BALANCE IRON AND RESIDUAL AMOUNTS OF OTHER ELEMENTS.
References Cited (Backward Citations)
US2478420A
Cited
US2528867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |