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：：Zirconic Metering Nozzles：：
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| Zirconic metering nozzle developed and produced by LIRR is of good corrosion and thermal shock resistance, long service life as well as low diameter enlarging rate. Excellent application results have been achieved in many domestic I&S words. |
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Item |
Nozzle cores |
Nozzle body |
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X-1 |
X-2 |
X-3 |
X-4 |
| Zr(Hf)O2, % ³ |
75 |
93 |
93 |
94 |
- |
| Al2O3, % ³ |
- |
- |
- |
- |
75 |
| Bulk density, g/cm3, ³ |
3.9 |
4.3 |
4.5 |
4.7 |
2.2 |
Apparent porosity, %, £
|
22 |
24 |
22 |
20 |
25 |
Cold crushing strength, MPa, ³
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60 |
60 |
80 |
- |
Service life, hrs, >
|
6 |
8 |
10 |
12 |
- |
Speed of diameter enlarging , mm/hrs, <
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0.2 |
0.1 |
0.1 |
0.1 |
- |
Thermal shock resistance, cycle, >
(water quenching at 1200 °C) |
5 |
5 |
5 |
5 |
5 |
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Application |
Used for small square billet con-casting and steel flow rate controlling
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