US4691844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immersion nozzle for continuous casting
Assignee: Coorstek KK
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Filing: 1987-03-05
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Granted: 1987-09-08
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Expires: 2007-03-05
Abstract
Abstract An immersion nozzle for continuous casting includes a nozzle body and a conduit extending longitudinally through the nozzle body. At least a portion of the interior surface of the nozzle which surrounds the conduit is made of a refractory material including 40-92 wt. % ZrO 2 , 5-40 wt. % C and 3-20 wt. % of an oxide admixture of (1) RO and RO 2 , wherein RO is at least one member selected from the group consisting of CaO, MgO and MnO; and RO 2 is at least one member selected from the group consisting of SiO 2 and TiO 2 ; or (2) RO, RO 2 and R 2 O 3 wherein RO and RO 2 are as defined above and R 2 O 3 is at least one member selected from the group consisting of Al 2 O 3 and Cr 2 O 3 .
Inventors
- 👤 Yoshihiro Ishino
- 👤 Sadanobu Sugiura
- 👤 Kunishige Tokunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:47
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/50; B22D41/52; B22D41/54
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
An immersion nozzle for continuous casting, comprising an elongated nozzle body and a conduit extending longitudinally through said nozzle body, said nozzle body having an interior surface defining said conduit, at least a portion of said interior surface being formed of a refractory material including 40-92 wt.% ZrO 2 , 5-40 wt.% C, and 3-20 wt.% of an admixture of RO and RO 2 wherein RO is at least one member selected from the group consisting of CaO, MgO and MnO; and RO 2 is at least one member selected from the group consisting of SiO 2 and TiO 2 .
Claim 2
Dependent Claim
101 words
An immersion nozzle for continuous casting, comprising an elongated nozzle body and a conduit extending longitudinally through said nozzle body, said nozzle body having an interior surface defining said conduit, at least a portion of said interior surface being formed of a refractory material including 40-92 wt.% ZrO 2 , 5-40 wt.% C, and 3-20 wt.% of an admixture of RO and RO 2 wherein RO is at least one member selected from the group consisting of CaO, MgO and MnO; and RO 2 is at least one member selected from the group consisting of SiO 2 and TiO 2 .
Claim 3
Dependent Claim
21 words
An immersion nozzle as defined in claim 1, wherein the whole of said nozzle body is made of said refractory material.
Claim 4
Dependent Claim
24 words
An immersion nozzle as defined in claim 1, additionally comprising a slag line protection sheath formed around an exterior surface of the nozzle body.
Claim 5
Dependent Claim
29 words
An immersion nozzle as defined in claim 3, wherein the slag line protection sheath is made of a refractory material including 77 wt.% ZrO 2 and 15 wt.% C.
Claim 6
Dependent Claim
19 words
An immersion nozzle as defined in claim 3, wherein the nozzle body is integral with said line protection sheath.
Claim 7
Dependent Claim
131 words
An immersion nozzle for continuous casting comprising an elongated nozzle body and a conduit extending longitudinally through said nozzle body, said nozzle body having an interior surface defining said conduit, at least a portion of said interior surface being formed of a refractory material including 40-92 wt.% ZrO 2 , 5-40 wt.% C, and 3-20 wt.% of an admixture of RO, RO 2 and R 2 O 3 wherein RO is at least one member selected from the group consisting of CaO, MgO and NnO; and RO 2 is at least one member selected from the group consisting of SiO 2 and TiO 2 ; and R 2 O 3 is at least one member selected from the group consisting of Al 2 O 3 and Cr 2 O 3 .
Claim 8
Dependent Claim
131 words
An immersion nozzle for continuous casting comprising an elongated nozzle body and a conduit extending longitudinally through said nozzle body, said nozzle body having an interior surface defining said conduit, at least a portion of said interior surface being formed of a refractory material including 40-92 wt.% ZrO 2 , 5-40 wt.% C, and 3-20 wt.% of an admixture of RO, RO 2 and R 2 O 3 wherein RO is at least one member selected from the group consisting of CaO, MgO and NnO; and RO 2 is at least one member selected from the group consisting of SiO 2 and TiO 2 ; and R 2 O 3 is at least one member selected from the group consisting of Al 2 O 3 and Cr 2 O 3 .
Claim 9
Dependent Claim
21 words
An immersion nozzle as defined in claim 6, wherein the whole of the nozzle body is formed of said refractory material.
Claim 10
Dependent Claim
24 words
An immersion nozzle as defined in claim 6, additionally comprising a slag line protection sheath formed around an exterior surface of the nozzle body.
Claim 11
Dependent Claim
29 words
An immersion nozzle as defined in claim 8, wherein the slag line protection sheath is made of a refractory material including 77 wt.% ZrO 2 and 15 wt.% C.
Claim 12
Dependent Claim
20 words
An immersion nozzle as defined line claim 8, wherein the nozzle body is integral with said slag line protection sheath.
References Cited (Backward Citations)
JPS5023333A
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JPS5066432A
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JPS55158858A
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JPS5633155A
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JPS5734075A
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JPS5751172A
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US4568007A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-07 | 1991-03-09 | 1991-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-07 | 1995-03-09 | 1995-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-07 | 1999-03-09 | 1999-09-08 | $7700.00 | Window Closed / Lapsed |