US4049429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferritic alloys of low flow stress for P/M forgings
Assignee: Huntington Alloys Corp
•
Filing: 1974-03-07
•
Granted: 1977-09-20
•
Expires: 1994-03-07
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
2026-10-23 18:30
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; C22C38/00; C22C38/16; B; B22; B22F; B22F2998/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A consolidated age-hardenable powder metallurgical alloy steel in the ferritic condition particularly adapted for PM/hot forging and characterized by (a) low flow stress, (b) good impact strength, (c) high resistance to fatigue and (d) good flowability such as to fill complex dies, said steel being formed from about 0.7% to about 1% nickel, 1.4% to 2% copper, 0.15% to 0.35% molybdenum, up to 0.02% carbon, up to 0.1% silicon, up to 0.15% manganese, and the balance essentially iron.
Claim 2
Dependent Claim
78 words
A consolidated age-hardenable powder metallurgical alloy steel in the ferritic condition particularly adapted for PM/hot forging and characterized by (a) low flow stress, (b) good impact strength, (c) high resistance to fatigue and (d) good flowability such as to fill complex dies, said steel being formed from about 0.7% to about 1% nickel, 1.4% to 2% copper, 0.15% to 0.35% molybdenum, up to 0.02% carbon, up to 0.1% silicon, up to 0.15% manganese, and the balance essentially iron.
Claim 3
Dependent Claim
27 words
A P/M steel in accordance with claim 1 in which the copper is from 1.5% to 1.8% and the molybdenum is from about 0.2% to about 0.3%.
Claim 4
Dependent Claim
26 words
A P/M steel in accordance with claim 1 in which oxygen does not exceed 0.03%, silicon is less than 0.05% and manganese does not exceed 0.1%.
Claim 5
Dependent Claim
10 words
A connecting rod forged from the steel of claim 1.
Claim 6
Dependent Claim
9 words
A gear forged from the steel of claim 1.
Claim 7
Dependent Claim
50 words
A consolidated age-hardenable powder metallurgical steel in the ferritic condition particularly adapted for PM/hot forging, said steel having from 0.7 to 1.25% nickel, from 0.75% to 2.25% copper, from 0.1 to 0.4% molybdenum, up to 0.2% silicon, up to 0.2% manganese, up to 0.03% carbon and the balance essentially iron.
Claim 8
Dependent Claim
50 words
A consolidated age-hardenable powder metallurgical steel in the ferritic condition particularly adapted for PM/hot forging, said steel having from 0.7 to 1.25% nickel, from 0.75% to 2.25% copper, from 0.1 to 0.4% molybdenum, up to 0.2% silicon, up to 0.2% manganese, up to 0.03% carbon and the balance essentially iron.
References Cited (Backward Citations)
US3067032A
Cited
US3110635A
Cited
US3303061A
Cited
US3471343A
Cited
US3655366A
Cited
US3827863A
Cited
US3856478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |