US4027720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing homogenous ingots of high-melting, nitrogen-containing alloys
Assignee: Vereinigte Edelstahlwerke AG
•
Filing: 1976-02-23
•
Granted: 1977-06-07
•
Expires: 1996-02-23
Abstract
Abstract In a method of producing homogenous ingots of high-melting, nitrogen-containing alloys, whose nitrogen contents are above the solubility limit at atmospheric pressure, according to the electric slag remelting process and using a pressure above atmospheric, a composite electrode consisting of at least one core made of a nitrogen-containing alloy and a jacket made of a nitrogen-containing alloy is used, wherein one of the nitrogen contents is higher and the other one is lower than that of the ingot to be produced.
Inventors
- 👤 Erwin Plockinger
- 👤 Otto Daghofer
- 👤 Farouk Barakat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:50
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/16; C22B9/18; B; B22; B22D; B22D23/00; B22D23/06; B22D23/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
118 words
In a method of producing homogenous ingots of high-melting, nitrogen-containing alloys having nitrogen contents exceeding the solubility limit at atmospheric pressure by electric slag remelting under a pressure higher than atmospheric pressure, the improvement comprising employing a composite electrode having at least one core consisting essentially of a first nitrogen-containing alloy and a jacket consisting essentially of a second nitrogen-containing alloy, said first nitrogen-containing alloy having a nitrogen content differing from the nitrogen content of said second nitrogen-containing alloy in that one of these nitrogen contents is hgher than the nitrogen content of the ingot to be produced, while the nitrogen content of the respective other nitrogen-containing alloy is lower than that of the ingot to be produced.
Claim 2
Dependent Claim
118 words
In a method of producing homogenous ingots of high-melting, nitrogen-containing alloys having nitrogen contents exceeding the solubility limit at atmospheric pressure by electric slag remelting under a pressure higher than atmospheric pressure, the improvement comprising employing a composite electrode having at least one core consisting essentially of a first nitrogen-containing alloy and a jacket consisting essentially of a second nitrogen-containing alloy, said first nitrogen-containing alloy having a nitrogen content differing from the nitrogen content of said second nitrogen-containing alloy in that one of these nitrogen contents is hgher than the nitrogen content of the ingot to be produced, while the nitrogen content of the respective other nitrogen-containing alloy is lower than that of the ingot to be produced.
Claim 3
Dependent Claim
60 words
A method as set forth in claim 1, wherein the at least one core of the composite electrode has a nitrogen content that is higher than the nitrogen content of the ingot to be produced and wherein the jacket of the composite electrode has a nitrogen content that is lower than the nitrogen content of the ingot to be produced.
Claim 4
Dependent Claim
58 words
A method as set forth in claim 1, wherein the jacket of the composite electrode has a nitrogen content that is higher than the nitrogen content of the ingot to be produced and wherein the at least one core of the composite electrode has a nitrogen content that is lower than that of the ingot to be produced.
Claim 5
Dependent Claim
20 words
A method as set forth in claim 1, wherein a composite electrode is employed that comprises a plurality of cores.
Claim 6
Dependent Claim
18 words
A method as set forth in claim 4, wherein the cores have nitrogen contents differing from one another.
Claim 7
Dependent Claim
29 words
A method as set forth in claim 1, wherein the pressure higher than the atmospheric pressure is produced by a gas that has a poor solubility in the slag.
Claim 8
Dependent Claim
23 words
A method as set forth in claim 6, wherein said gas is selected from the group consisting of nitrogen, argon and dry air.
Claim 9
Dependent Claim
23 words
A method as set forth in claim 1, wherein the at least one core of the composite electrode is cast into the jacket.
Claim 10
Dependent Claim
24 words
A method as set forth in claim 1, wherein the jacket of the composite electrode is cast to surround the at least one core.
Claim 11
Dependent Claim
27 words
A method as set forth in claim 1, wherein the at least one core of the composite electrode is produced by filling alloy particles into the jacket.
Claim 12
Dependent Claim
14 words
A method as set forth in claim 10, wherein the alloy particles are sintered.
Claim 13
Dependent Claim
23 words
A method as set forth in claim 1, wherein the jacket of the composite electrode is produced of individual alloy particles by sintering.
Claim 14
Dependent Claim
18 words
A method as set forth in claim 12, wherein the composite electrode is surrounded by a sheet casing.
Claim 15
Dependent Claim
30 words
A method as set forth in claim 1, wherein the at least one core is produced by sintering in a separate mould each and then the jacket is cast therearound.
Claim 16
Dependent Claim
34 words
A method as set forth in claim 1, wherein the at least one core is produced by sintering in a separate mould each and the jacket is made of individual alloy particles by sintering.
Claim 17
Dependent Claim
17 words
A method as set forth in claim 15, wherein the jacket is surrounded by a sheet casing.
Claim 18
Dependent Claim
39 words
A method as set forth in claim 1, wherein the jacket is made of individual alloy particles by sintering and wherein the at least one core of the composite electrode is produced by filling alloy particles into the jacket.
Claim 19
Dependent Claim
17 words
A method as set forth in claim 17, wherein the jacket is surrounded by a sheet casing.
Claim 20
Dependent Claim
29 words
A method as set forth in claim 17, wherein the alloy particles filled into the jacket to form the at least one core of the composite electrode are sintered.
References Cited (Backward Citations)
CA870527A
Cited
US3203783A
Cited
US3282676A
Cited
US3344839A
Cited
US3640700A
Cited
US3905803A
Cited
US3930531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |