US3886992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating metal melts with a purging gas during the process of continuous casting
Assignee: SMS Concast AG
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Filing: 1972-05-26
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Granted: 1975-06-03
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Expires: 1992-05-26
Abstract
Abstract A method of, and apparatus for, treating metal melts during continuous casting, wherein the teeming metal is enclosed to a point below the surface of the metal pool in the continuous casting mold to avoid contact with the ambient atmosphere and the surface of the pool is covered with a layer of slag. Small volumes of purging gas are introduced in bubble form into the metal melt at the location where such metal melt begins to form a teeming jet.
Inventors
- 👤 Hermann Maas
- 👤 Horst Abratis
- 👤 Claus Raeune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:22
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/05; B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; C21; C21C; C21C7/00; C21C7/0037; C21C7/0043; C21C7/0068
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A method of treating metal melts during continuous casting for suppressing the formation of undesirable oxidic non-metallic inclusions, comprising the steps of enclosing the teeming metal to a point below the surface of the metal pool in a continuous casting mold to avoid contact with the ambient atmosphere, covering the surface of the pool with a layer of slag, and introducing small volumes of purging gas in bubble form into the metal melt at the location where such metal melt begins to form a teeming jet, so that the injector-like action of the melt divides the gas into a multiplicity of very small bubbles which are carried into the mold by the melt.
Claim 2
Independent Claim
113 words
A method of treating metal melts during continuous casting for suppressing the formation of undesirable oxidic non-metallic inclusions, comprising the steps of enclosing the teeming metal to a point below the surface of the metal pool in a continuous casting mold to avoid contact with the ambient atmosphere, covering the surface of the pool with a layer of slag, and introducing small volumes of purging gas in bubble form into the metal melt at the location where such metal melt begins to form a teeming jet, so that the injector-like action of the melt divides the gas into a multiplicity of very small bubbles which are carried into the mold by the melt.
Claim 3
Independent Claim
113 words
A method of treating metal melts during continuous casting for suppressing the formation of undesirable oxidic non-metallic inclusions, comprising the steps of enclosing the teeming metal to a point below the surface of the metal pool in a continuous casting mold to avoid contact with the ambient atmosphere, covering the surface of the pool with a layer of slag, and introducing small volumes of purging gas in bubble form into the metal melt at the location where such metal melt begins to form a teeming jet, so that the injector-like action of the melt divides the gas into a multiplicity of very small bubbles which are carried into the mold by the melt.
Claim 4
Independent Claim
113 words
A method of treating metal melts during continuous casting for suppressing the formation of undesirable oxidic non-metallic inclusions, comprising the steps of enclosing the teeming metal to a point below the surface of the metal pool in a continuous casting mold to avoid contact with the ambient atmosphere, covering the surface of the pool with a layer of slag, and introducing small volumes of purging gas in bubble form into the metal melt at the location where such metal melt begins to form a teeming jet, so that the injector-like action of the melt divides the gas into a multiplicity of very small bubbles which are carried into the mold by the melt.
Claim 5
Dependent Claim
38 words
The method as defined in claim 1, including the step of introducing deoxidants and alloying elements together with the purging gas into the metal melt at the location where such metal melt begins to form a teeming jet.
Claim 6
Dependent Claim
24 words
The method as defined in claim 2, wherein the deoxidants and alloying elements are introduced continuously at a rate corresponding to the casting rate.
Claim 7
Dependent Claim
25 words
The method as defined in claim 2, wherein the deoxidants and the alloying elements are added at a rate which progressively increases as casting continues.
Claim 8
Independent Claim
106 words
A method of treating metal melts during continuous casting in order to reduce the formation of undesirable oxidic accumulations, comprising the steps of confining the teeming metal so as to avoid contact with the ambient atmosphere to a location below the surface of the metal pool in a continuous casting mold, and introducing small volumes of purging gas in bubble form into the metal melt approximately at the location where the metal melt begins to form a teeming jet, so that the injector-like action of the melt divides the gas into a multiplicity of very small bubbles which are carried into the mold by the melt.
Claim 9
Independent Claim
106 words
A method of treating metal melts during continuous casting in order to reduce the formation of undesirable oxidic accumulations, comprising the steps of confining the teeming metal so as to avoid contact with the ambient atmosphere to a location below the surface of the metal pool in a continuous casting mold, and introducing small volumes of purging gas in bubble form into the metal melt approximately at the location where the metal melt begins to form a teeming jet, so that the injector-like action of the melt divides the gas into a multiplicity of very small bubbles which are carried into the mold by the melt.
Claim 10
Dependent Claim
38 words
The method as defined in claim 1, including the step of introducing at least alloying elements together with the purging gas into the metal melt at the location where such metal melt begins to form a teeming jet.
Claim 11
Dependent Claim
22 words
The method as defined in claim 6, wherein the alloying elements are introduced continuously at a rate corresponding to the casting rate.
Claim 12
Dependent Claim
22 words
The method as defined in claim 6, wherein the alloying elements are introduced at a rate which progressively increases as casting continues.
Claim 13
Dependent Claim
35 words
The method as defined in claim 1, including the step of introducing deoxidants together with the purging gas into the metal melt at the location where such metal melt begins to form a teeming jet.
Claim 14
Dependent Claim
21 words
The method as defined in claim 9, wherein the deoxidants are introduced continuously at a rate corresponding to the casting rate.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |