US3864809A
Expired / Lapsed
US
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Process of producing by powder metallurgy techniques a ferritic hot forging of low flow stress
Assignee: Huntington Alloys Corp
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Filing: 1973-03-29
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Granted: 1975-02-11
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Expires: 1993-03-29
Abstract
Abstract Ferritic age-hardenable alloy steels containing correlated percentages of nickel, copper, molybdenum, carbon, etc. in powder form are characterized by low flow stress, thus rendering them particularly suitable for P/M hot forging.
Inventors
- 👤 Stephen James Donachie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:02
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; B; B22; B22F; B22F2998/00; Y; Y10; Y10S; Y10S72/00; Y10S72/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
In the process of producing by powder metallurgy techniques a steel hot forging wherein die wear is reduced, which process comprises forming a preform from a ferritic alloy steel powder, and hot forging said preform at a temperature not greater than about 1550*F., said powder consisting essentially of about 0.7 to about 1 percent nickel, 1.4 to 2 percent copper, 0.15 to 0.35 percent molybdenum, up to 0.02 percent carbon, up to 0.1 percent silicon, up to 0.15 percent manganese, the balance essentially iron, the forging being able to be carried out at such temperature largely by reason of the low flow stress characteristics of the steel composition.
Claim 2
Dependent Claim
108 words
In the process of producing by powder metallurgy techniques a steel hot forging wherein die wear is reduced, which process comprises forming a preform from a ferritic alloy steel powder, and hot forging said preform at a temperature not greater than about 1550*F., said powder consisting essentially of about 0.7 to about 1 percent nickel, 1.4 to 2 percent copper, 0.15 to 0.35 percent molybdenum, up to 0.02 percent carbon, up to 0.1 percent silicon, up to 0.15 percent manganese, the balance essentially iron, the forging being able to be carried out at such temperature largely by reason of the low flow stress characteristics of the steel composition.
Claim 3
Dependent Claim
27 words
A process in accordance with claim 1 in which the copper is from 1.5 to 1.8 percent and the molybdenum is from 0.2 to about 0.3 percent.
Claim 4
Dependent Claim
28 words
A process in accordance with claim 1 in which oxygen does not exceed 0.03 percent, silicon is less than 0.05 percent and manganese does not exceed 0.1 percent.
Claim 5
Dependent Claim
22 words
A process in accordance with claim 1 in which the hot forging temperature is from about 1400*F. to less than about 1550*F.
Claim 6
Dependent Claim
96 words
IN THE PROCESS OF PRODUCING BY POWDER METALLURGY TECHNIQUES A STEEL HOT FORGING WHEREIN DIE WEAR IS REDUCED, WHICH PROCESS COMPRISES FORMING A PREFORM FROM A FERRITIC ALLOY STEEL POWDER, AND HOT FORGING SAID PREFORM AT A TEMPERATURE NOT GREATER THAN ABOUT 1550*F., SAID POWDER CONSISTING ESSENTIALLY OF FROM 0.25 TO LESS THAN 1.5 PERCENT NICKEL, 0.75 TO 2.25 PERCENT COPPER, 0.1 TO 0.6 PERCENT MOLYBDENUM, UP TO 0.5 PERCENT MAANGANESE, UP TO 0.3 PERCENT SILICON, UP TO 0.5 PERCENT CHROMIUM, UP TO 0.02 PERCENT BORON, UP TO 0.05 PERCENT CARBON AND THE BALANCE ESSENTIALLY IRON.
Claim 7
Dependent Claim
96 words
IN THE PROCESS OF PRODUCING BY POWDER METALLURGY TECHNIQUES A STEEL HOT FORGING WHEREIN DIE WEAR IS REDUCED, WHICH PROCESS COMPRISES FORMING A PREFORM FROM A FERRITIC ALLOY STEEL POWDER, AND HOT FORGING SAID PREFORM AT A TEMPERATURE NOT GREATER THAN ABOUT 1550*F., SAID POWDER CONSISTING ESSENTIALLY OF FROM 0.25 TO LESS THAN 1.5 PERCENT NICKEL, 0.75 TO 2.25 PERCENT COPPER, 0.1 TO 0.6 PERCENT MOLYBDENUM, UP TO 0.5 PERCENT MAANGANESE, UP TO 0.3 PERCENT SILICON, UP TO 0.5 PERCENT CHROMIUM, UP TO 0.02 PERCENT BORON, UP TO 0.05 PERCENT CARBON AND THE BALANCE ESSENTIALLY IRON.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |