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US3660074A
Expired / Lapsed
US
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Method for treating titanium scrap
Assignee: Crucible Materials Corp
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Filing: 1969-05-07
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Granted: 1972-05-02
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Expires: 1989-05-07
Abstract
Abstract This is a process for melting titanium scrap to provide a material free from dense inclusions. This is accomplished by melting a quantity of titanium scrap in a crucible, maintaining the same molten for a period sufficient to either melt dense inclusions or have them in unmelted form sink to the bottom of the melt, discontinuing heating to form a solidified skull adjacent to the bottom of the melt to entrap the inclusions and then removing the inclusion-free metal from the crucible.
Inventors
- 👤 Russell C Buehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:47
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1295; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
18 words
The method of claim 1 wherein heat is applied continuously during feeding of said scrap to said mold.
Claim 2
Dependent Claim
38 words
The method of claim 1 wherein at least a portion of the scrap initially introduced to the mold to initially form the molten pool is replaced with titanium sponge, whereby heat transfer through the mold walls is reduced.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein means are used for reducing heat loss from the molten pool surface during melting.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said heating and melting is achieved by the use of a nonconsumable electrode.
Claim 5
Dependent Claim
46 words
The method of claim 1 wherein said initial scrap is introduced to the mold in an amount to provide a layer of about 4 to 6 inches thick and upon melting the periphery of the molten pool is spaced about 1 inch from the mold interior.
Claim 6
Dependent Claim
27 words
The method of claim 1 wherein said scrap is cleaned of surface contaminants and comminuted to a substantially uniform size consist prior to introduction to said mold.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein magnetic material is removed from said scrap prior to introduction to said mold.
Claim 8
Independent Claim
173 words
A method for melting titanium scrap in a nonoxidizing atmosphere to remove dense inclusions comprising preparing said scrap for melting by crushing a quantity of scrap to pieces of substantially uniform size, cleaning said scrap to remove surface contaminants and removing magnetic material from said scrap, introducing a quantity of said scrap to a mold to a depth of about 4 to 6 inches, arc melting said scrap by the use of a nonconsumable electrode to form a molten pool thereof having a periphery spaced a distance from the mold interior, feeding additional titanium scrap to said mold while continuing said aRc melting to form an increasing pool of liquid metal within said mold, discontinuing said feeding of scrap to the mold while continuing said arc melting to maintain said pool liquid and permitting unmelted dense inclusions to sink to said periphery, discontinuing said arc melting for a period of time sufficient to form a solidified metal layer adjacent said periphery and trap said inclusions therein and withdrawing liquid metal from said mold.
Claim 9
Dependent Claim
39 words
The method of claim 9 wherein at least a portion of the titanium scrap initially introduced to the mold to initially form the molten pool is replaced with titanium sponge, whereby heat transfer through the mold walls is reduced.
Claim 10
Dependent Claim
20 words
The method of claim 10 wherein means are used to reduce heat loss from the molten pool surface during melting.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |