US3696486A
Expired / Lapsed
US
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Stainless steels by powder metallurgy
Assignee: Huntington Alloys Corp
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Filing: 1969-08-25
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Granted: 1972-10-10
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Expires: 1989-08-25
Abstract
Abstract This invention relates to the powder metallurgy of dispersion strengthened stainless steel and also to dispersion strengthened precipitation hardenable stainless steels and wrought products thereof. The invention also relates to a powder metallurgy method for producing wrought metal shapes of such steels characterized metallographically by a uniform distribution of dispersoids in both the longitudinal and transverse directions.
Inventors
- 👤 John Stanwood Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:07
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; Y; Y10; Y10S; Y10S75/00; Y10S75/95; Y10S75/951
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
The powder metallurgy article of manufacture of claim 1, wherein the stainless steel composition ranges from about 8 to 28 percent chromium, about 4 to 20 percent nickel, up to about 4 percent manganese and the balance essentially at least about 55 percent iron.
Claim 2
Dependent Claim
38 words
The powder metallurgy article of claim 1, wherein the composition includes about 0.05 to 10 volume percent of a refractory compound dispersoid, and containing less than 5 volume percent of segregated regions exceeding 1 micron in minimum dimension.
Claim 3
Dependent Claim
77 words
The powder metallurgy article of claim 3, wherein the stainless steel composition is a precipitation hardenable grade containing at least 0.2 percent of at least one precipitation hardening element selected from the group consisting of up to about 2 percent aluminum, up to 2 percent titanium, up to about 2 percent columbium, up to about 7 percent copper, up to 0.4 percent phosphorus, up to 0.25 percent nitrogen and 0.05 to 5 volume percent of the dispersoid.
Claim 4
Dependent Claim
89 words
The powder metallurgy article of manufacture of claim 1, wherein the dispersoid ranges from about 0.05 to 5 volume percent at an average particle size of about 10 to 1,000 Angstroms and at an average interparticle spacing of less than 1 micron, said wrought stainless steel shape being characterized by compositional uniformity throughout, by optimum precipitation hardening response, and by a high degree of dispersion uniformity substantially free from stringers over any selected area taken in longitudinal or transverse section of up to about 500 microns in average diameter.
References Cited (Backward Citations)
US3085876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |