US3630267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling the temperature of molten ferrous metal
Assignee: Bethlehem Steel Corp
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Filing: 1970-05-18
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Granted: 1971-12-28
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Expires: 1990-05-18
Abstract
Abstract A method of controlling the temperature of molten ferrous metal poured from a bottom pour transfer ladle over an extended period of time. A thick layer of molten slag is placed on the surface of the molten metal to suppress the formation of convection currents in the ladle. A formula provides the relationship between pouring time and the minimum thickness of the molten slag layer required to obtain a substantially constant temperature of the metal discharged from the ladle.
Inventors
- 👤 Joseph W Hlinka
- 👤 Andrew P Smith
- 👤 Andrew J Slabikosky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:15
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/111
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A method of of maintaining a substantially constant temperature of molten ferrous metal being poured from a bottompour ladle into a receptacle over an extended period of time comprising: a. pouring the molten ferrous metal into said ladle, b. placing a layer of molten slag obtained from the furnace in which the molten ferrous metal was melted and refined on the surface of said metal in said ladle, the thickness of said slag expressed in inches, being at least equal to the value of 0.085 X T plus 5.5, where T is the total pouring time, expressed in minutes, and c. pouring said molten metal from the bottom of said ladle into said receptacle.
Claim 2
Independent Claim
114 words
A method of of maintaining a substantially constant temperature of molten ferrous metal being poured from a bottompour ladle into a receptacle over an extended period of time comprising: a. pouring the molten ferrous metal into said ladle, b. placing a layer of molten slag obtained from the furnace in which the molten ferrous metal was melted and refined on the surface of said metal in said ladle, the thickness of said slag expressed in inches, being at least equal to the value of 0.085 X T plus 5.5, where T is the total pouring time, expressed in minutes, and c. pouring said molten metal from the bottom of said ladle into said receptacle.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which the molten ferrous metal is steel.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which the receptacle is a tundish.
Claim 5
Dependent Claim
120 words
The method of claim 1 in which the receptacle is a mold. 5. In the continuous casting of steel, a method of of maintaining a substantially constant temperature of molten steel being poured into the continuous casting machine comprising: a. tapping the molten steel into a bottom pour transfer ladle, b. placing a layer of molten slag on the surface of said steel in said ladle, the thickness of said slag layer, expressed in inches, being equal to or greater than the value of 0.085 X T plus 5.5, where T is the total pouring time, expressed in minutes, c. pouring said steel from the bottom of said ladle into a receptacle forming a part of said continuous casting machine.
Claim 6
Dependent Claim
13 words
The method of claim 4 in which the receptacle is an open-ended mold.
Claim 7
Dependent Claim
12 words
The method of claim 4 in which the receptacle is a tundish.
References Cited (Backward Citations)
US2493394A
Cited
US3465811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |