Patent US4298376A successfully refreshed from Google Patents.
US4298376A
Expired / Lapsed
US
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Method for treating molten steel and apparatus therefor
Assignee: Kobe Steel Ltd
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Filing: 1980-04-14
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Granted: 1981-11-03
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Expires: 2000-04-14
Abstract
Abstract A method for treating molten steel utilizing an induction coil, a ladle, a treating vessel and at least one passage pipe interconnecting the ladle and the treating vessel which includes the steps of lifting up a part of the molten steel from the ladle to the treating vessel disposed over the ladle through adjustment of molten steel composition and/or degassing in the treating vessel, thereafter returning the molten steel to the ladle through the at least one passage pipe, circulating or reciprocating the molten steel between the ladle and the treating vessel while heating the molten steel by the induction coil disposed around the at least one passage pipe and operating the linear motor at a frequency of 50 to 60 cycles.
Inventors
- 👤 Kiichi Narita
- 👤 Takasuke Mori
- 👤 Kenzo Ayata
- 👤 Takehisa Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:04
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
152 words
A method for treating molten steel utilizing at least one induction coil, a ladle, a treating vessel and at least one passage pipe interconnecting said ladle and said treating vessel, which comprises: positioning an induction coil around each of said passage pipes; lifting up a part of said molten steel through each of said passage pipes from said ladel to said treating vessel disposed over said ladle through adjustment of molten steel composition in said treating vessel; thereafter returning said molten steel to said ladle through each of said passage pipes; circulating said molten steel between said ladle and said treating vessel while heating said molten steel by reversing direction of flow of said molten steel in each of said passage pipes by operation of each of said induction coils disposed around each of said passage pipes; and operating each of said induction coils at a frequency of 50 to 60 cycles.
Claim 2
Independent Claim
152 words
A method for treating molten steel utilizing at least one induction coil, a ladle, a treating vessel and at least one passage pipe interconnecting said ladle and said treating vessel, which comprises: positioning an induction coil around each of said passage pipes; lifting up a part of said molten steel through each of said passage pipes from said ladel to said treating vessel disposed over said ladle through adjustment of molten steel composition in said treating vessel; thereafter returning said molten steel to said ladle through each of said passage pipes; circulating said molten steel between said ladle and said treating vessel while heating said molten steel by reversing direction of flow of said molten steel in each of said passage pipes by operation of each of said induction coils disposed around each of said passage pipes; and operating each of said induction coils at a frequency of 50 to 60 cycles.
Claim 3
Independent Claim
126 words
A method for treating molten steel utilizing at least one induction coil, a ladle, a treating vessel and at least one passage pipe interconnecting said ladle and said treating vessel, which comprises: lifting up a part of said molten steel from said ladle to said treating vessel disposed over said ladle through degassing; thereafter returning said molten steel to said ladle through each of said passage pipes; circulating said molten steel between said ladle and said treating vessel while heating said molten steel by reversing direction of flow of said molten steel in each of said passage pipes by operation of each of said induction coils disposed around each of said passage pipes; and operating said induction coil at a frequency of 50 to 60 cycles.
Claim 4
Independent Claim
126 words
A method for treating molten steel utilizing at least one induction coil, a ladle, a treating vessel and at least one passage pipe interconnecting said ladle and said treating vessel, which comprises: lifting up a part of said molten steel from said ladle to said treating vessel disposed over said ladle through degassing; thereafter returning said molten steel to said ladle through each of said passage pipes; circulating said molten steel between said ladle and said treating vessel while heating said molten steel by reversing direction of flow of said molten steel in each of said passage pipes by operation of each of said induction coils disposed around each of said passage pipes; and operating said induction coil at a frequency of 50 to 60 cycles.
Claim 5
Independent Claim
154 words
A method for treating molten steel utilizing at least one induction coil, a ladle, a treating vessel and at least one passage pipe interconnecting said ladle and said treating vessel, which comprises: positioning an induction coil around each of said passage pipes; lifting up a part of said molten steel from said ladle to said treating vessel disposed over said ladle through adjustment of molten steel composition in said treating vessel; thereafter returning said molten steel to said ladle through each of said passage pipes; reciprocating flow of said molten steel within each of said passage pipes between said ladle and said treating vessel while heating said molten steel by reversing direction of flow of said molten steel in each of said passage pipes by operation of each of said induction coils disposed around each of said passage pipes; and operating each of said induction coils at a frequency of 50 to 60 cycles.
Claim 6
Independent Claim
154 words
A method for treating molten steel utilizing at least one induction coil, a ladle, a treating vessel and at least one passage pipe interconnecting said ladle and said treating vessel, which comprises: positioning an induction coil around each of said passage pipes; lifting up a part of said molten steel from said ladle to said treating vessel disposed over said ladle through adjustment of molten steel composition in said treating vessel; thereafter returning said molten steel to said ladle through each of said passage pipes; reciprocating flow of said molten steel within each of said passage pipes between said ladle and said treating vessel while heating said molten steel by reversing direction of flow of said molten steel in each of said passage pipes by operation of each of said induction coils disposed around each of said passage pipes; and operating each of said induction coils at a frequency of 50 to 60 cycles.
Claim 7
Independent Claim
44 words
The method as defined in claims 1, 2 or 3, which further comprises accelerating descending flow of said molten steel by each of said induction coils disposed around each of said passage pipes upon returning molten steel to said ladle through said passage pipes.
Claim 8
Independent Claim
25 words
A method as defined in claims 1, 2 or 3, which further comprises holding said molten steel in said treating vessel for a preset time.
Claim 9
Independent Claim
38 words
A method as defined in claims 1, 2 or 3, which further comprises ejecting molten steel lifted up to said treating vessel through each of said passage pipes over a surface of molten steel in said treating vessel.
Claim 10
Dependent Claim
70 words
Apparatus for treating molten steel, comprising: a ladle for containing molten steel; a treating vessel disposed over said ladle; at least one passage pipe connecting said ladle with said treating vessel; and an induction coil disposed around each of said passage pipes operated with a frequency of 50 to 60 cycles for generating reversible flow of molten metal within each of said passage pipes to and from said treating vessel.
Claim 11
Dependent Claim
70 words
Apparatus for treating molten steel, comprising: a ladle for containing molten steel; a treating vessel disposed over said ladle; at least one passage pipe connecting said ladle with said treating vessel; and an induction coil disposed around each of said passage pipes operated with a frequency of 50 to 60 cycles for generating reversible flow of molten metal within each of said passage pipes to and from said treating vessel.
Claim 12
Dependent Claim
21 words
An apparatus as defined in claim 7, said treating vessel furthe comprising a port formed therein for addition of alloy elements.
Claim 13
Dependent Claim
18 words
An apparatus as defined in claim 7, further comprising vacuum degassing means operatively associated with said treating vessel.
Claim 14
Dependent Claim
35 words
An apparatus as defined in claim 7, each of said passage pipes projecting into said treating vessel and further comprising a nozzle attached to a tip portion of at least one of said passage pipes.
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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |