Claims
- 1. A continuous casting nozzle for casting molten steel, wherein the surface layer of the bore of said continuous casting nozzle contacting with the molten steel is formed of a refractory comprising:
- (a) graphite from 10 to 35 wt %;
- (b) an aggregate of 10 to 60 wt % selected from alumina, zirconia, zircon, or alumina-silica; and
- (c) roseki containing the pyrophyllite (Al.sub.2 O.sub.3 .multidot.4SiO.sub.2 .multidot.H.sub.2 O) as the main component as the remaining part of the above mentioned materials.
- 2. A continuous casting nozzle for casting molten steel, wherein the surface layer of the bore of said continuous casting nozzle contacting with the molten steel is formed of a refractory comprising:
- (a) graphite from 10 to 35 wt %;
- (b) an aggregate of 10 to 60 wt % selected from alumina, zirconia, zircon, or alumina-silica;
- (c) roseki containing the pyrophyllite (Al.sub.2 O.sub.3 .multidot.4SiO.sub.2 .multidot.H.sub.2 O) as the main component as the remaining part of the above mentioned materials; and
- a binder being added to said refractory, said refractory with said binder added being kneaded, formed and sintered in an anti-oxidizing atmosphere.
- 3. A continuous casting nozzle according to claim 1, wherein said roseki containing the pyrophyllite as the main component, is calcinated at a temperature equal to or greater than 800.degree. C. so as to remove any residual moisture while containing an alkaline component from 1 to 5 wt %.
- 4. A continuous casting nozzle according to claim 2, wherein a mixing weight ratio of said roseki, whose average grain diameter is equal to or less than 250 .mu.m, is equal to or less than 60% relative to the whole of said roseki content.
- 5. A continuous casting nozzle according to claim 2, wherein said binder is a thermosetting resin.
- 6. A continuous casting nozzle for casting molten steel, wherein the surface layer of the bore of said continuous casting nozzle contacting with the molten steel is formed of a refractory comprising:
- (a) graphite from 10 to 35 wt %:
- (b) an aggregate of 10 to 60 wt % selected from alumina, zirconia, zircon, or alumina-silica;
- (c) roseki containing the pyrophyllite (Al.sub.2 O.sub.3 .multidot.4SiO.sub.2 .multidot.H.sub.2 O) as the main component as the remaining part of the above mentioned materials; and
- a binder being added to said refractory, said refractory with said binder added being kneaded, formed and sintered in an anti-oxidizing atmosphere, wherein said forming process is a CIP process.
- 7. A continuous casting nozzle according to claim 2, wherein said roseki containing the pyrophyllite as the main component, is calcinated at a temperature equal to or greater than 800.degree. C. so as to remove any residual moisture while containing an alkaline component from 1 to 5 wt %.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-342597 |
Dec 1996 |
JPX |
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Parent Case Info
This is a continuation-in-part application of U.S. Pat. application Ser. No. 8/911,535 filed on Oct. 16, 1997, now U.S. Pat. No. 5,858,261 the contents of which is incorporated herein by reference.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4208214 |
Stein et al. |
Jun 1980 |
|
5482904 |
Kawabe et al. |
Jan 1996 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
911535 |
Oct 1997 |
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