Patent US3814167A successfully refreshed from Google Patents.
US3814167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating non-metallic inclusions from hot liquid metal
Assignee: ES ALPINE MONTAN AG
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Filing: 1972-06-01
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Granted: 1974-06-04
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Expires: 1992-06-01
Abstract
Abstract The disclosure relates to a process for separating non-metallic inclusions from hot liquid metal, in particular from aluminum killed soft steel, in continuous casting plants, wherein the metal supplied into a tundish is guided at least once in upward direction to the surface of the metal sump in said tundish under formation of at least one stream at a speed greater than that of the metal in the tundish prior to its being deflected, whereby a wave is formed at the surface of the metal covered by slag. The metal is guided towards the surface of the metal sump by means of a partition wall having at least one opening from which a canal extends in upward direction to end at a distance of from 3 to 30 cm below the metal sump surface.
Inventors
- 👤 F Listhuber
- 👤 T Fastner
- 👤 E Bachner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:22
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/116; B22D11/117; B22D11/118
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
A process for separating non-metallic inclusions from hot liquid metal in a tundish which is separated into first and second compartments, the second compartment containing a liquid metal sump covered by a slag layer, comprising: supplying the metal to the first compartment; guiding the metal in the first compartment into the second compartment in the form of at least one stream of metal, said stream originating at a preselected distance of from 3 to 30 cm below the metal sump surface and being directed at a speed in a certain range in an upward direction to impinge against the slag layer and form a wave therein, the speed of said stream being adjusted to remain within a range of from 3.5 to 31 cm/sec when the preselected distance is 3 cm and linearly increasing with distance to a range of from 17.5 to 45 cm/sec when the preselected distance is 30 cm; and allowing the metal in the second compartment to exit through a drain in the second compartment.
Claim 2
Dependent Claim
169 words
A process for separating non-metallic inclusions from hot liquid metal in a tundish which is separated into first and second compartments, the second compartment containing a liquid metal sump covered by a slag layer, comprising: supplying the metal to the first compartment; guiding the metal in the first compartment into the second compartment in the form of at least one stream of metal, said stream originating at a preselected distance of from 3 to 30 cm below the metal sump surface and being directed at a speed in a certain range in an upward direction to impinge against the slag layer and form a wave therein, the speed of said stream being adjusted to remain within a range of from 3.5 to 31 cm/sec when the preselected distance is 3 cm and linearly increasing with distance to a range of from 17.5 to 45 cm/sec when the preselected distance is 30 cm; and allowing the metal in the second compartment to exit through a drain in the second compartment.
Claim 3
Dependent Claim
17 words
The process set forth in claim 13, wherein non-metallic inclusions are separated from aluminum killed soft steel.
Claim 4
Dependent Claim
35 words
The process set forth in claim 13, wherein the at least one stream is directed towards the surface of the metal sump covered by a slag layer at an angle of from 30* to 90*.
Claim 5
Dependent Claim
235 words
A process for separating non-metallic inclusions from hot liquid steel comprising 0 to 0.20 percent C, 0.25 to 1.60 percent Mn, 0.02 to 0.1 percent Al and 0 to 30 percent Si, balance iron, in a tundish of a continuous casting plant, said tundish being separated into first and second compartments and containing a liquid metal sump covered by a slag layer in the second compartment, comprising the steps of: supplying the steel containing the impurities to the first compartment of the tundish; guiding the metal in the first compartment of the tundish into the second compartment of the tundish in the form of at least one stream of metal, said stream originating at a preselected distance of from 3 to 30 cm below the metal sump surface in the second compartment and being directed at a speed in a certain range in an upward direction to impinge against the slag and form a wave therein, the speed of said stream being adjusted to remain within a range of from 3.5 to 31 cm/sec when the preselected distance is 3 cm and linearly increasing with distance to range of from 17.5 to 45 cm/sec when the preselected distance is 30 cm; and permitting the steel to flow out of the second compartment of said tundish through at least one drain tube into a water-cooled mould from which a solidifying cast bar is continuously drawn out.
Claim 6
Dependent Claim
235 words
A process for separating non-metallic inclusions from hot liquid steel comprising 0 to 0.20 percent C, 0.25 to 1.60 percent Mn, 0.02 to 0.1 percent Al and 0 to 30 percent Si, balance iron, in a tundish of a continuous casting plant, said tundish being separated into first and second compartments and containing a liquid metal sump covered by a slag layer in the second compartment, comprising the steps of: supplying the steel containing the impurities to the first compartment of the tundish; guiding the metal in the first compartment of the tundish into the second compartment of the tundish in the form of at least one stream of metal, said stream originating at a preselected distance of from 3 to 30 cm below the metal sump surface in the second compartment and being directed at a speed in a certain range in an upward direction to impinge against the slag and form a wave therein, the speed of said stream being adjusted to remain within a range of from 3.5 to 31 cm/sec when the preselected distance is 3 cm and linearly increasing with distance to range of from 17.5 to 45 cm/sec when the preselected distance is 30 cm; and permitting the steel to flow out of the second compartment of said tundish through at least one drain tube into a water-cooled mould from which a solidifying cast bar is continuously drawn out.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |