Zirconia Core
High erosion resistant calcia stabilized zirconia core, inner insert of tundish metering nozzle for steel continuous casting. Low bore enlargement, anti-clogging, strict dimension inspection, custom drawings & bulk supply available. Inquiry now.
Products Description
Zirconia Core, also known as zirconia insert, is the critical functional inner refractory part assembled inside tundish metering nozzle for steel continuous casting. Made of high-purity calcia stabilized zirconia, manufactured via isostatic pressing and high-temperature sintering.
As the direct contact layer with molten steel, it decides casting stability, casting duration and breakout risk. It works together with alumina-carbon outer sleeve to form a complete sizing nozzle assembly. It is widely applied in billet, bloom and slab continuous casting machines for different steel grades.
Key Features
- Superior resistance to molten steel erosion and slag corrosion, extended continuous casting campaign time
- Controlled bore enlargement rate, steady flow rate and constant casting speed, less steel fluctuation
- Good anti-alumina adhesion property, effectively reduce nozzle clogging and unplanned casting stop
- Reliable thermal shock resistance, resist cracking under frequent temperature swing during ladle change
- High temperature dimensional stability, no softening or deformation under long-term high heat load
- Tight tolerance control on inner bore, taper and outer circle, good interchangeability for mass assembly
- Low gas evolution, avoid steel surface defects and inclusion pollution to molten steel
Technical Specification
| Item | Standard Value |
|---|---|
| Material | Calcia Stabilized Zirconia |
| ZrO₂+HfO₂ | ≥94% |
| CaO | 4~6% |
| Bulk Density | 5.45–5.60 g/cm³ |
| Apparent Porosity | ≤9% |
| Refractoriness | >2000 ℃ |
| Inner Diameter | Custom |
| Outer Dimension / Taper | Custom |
| Tolerance of Bore | ±0.1~±0.2 mm |
Application
- Inner core of tundish metering nozzle / sizing nozzle
- Billet, small bloom, rectangular bloom continuous casting
- Carbon steel, low alloy steel, medium alloy steel, structural steel casting
- Steel mill tundish flow control, steady casting sequence
- Suitable for long sequence casting requirements
Why choose us?
✅ Quality control
Every batch comes with material test certificate (MTC). We test bulk density, porosity, chemical composition and dimension. Visual inspection + dimensional sampling before packing. Third-party inspection is acceptable.
✅ Batch consistency
Stable raw material formula and fixed sintering curve. Little performance difference between different batches, avoid unstable casting from batch fluctuation.
✅ Cost optimization
Long service life helps reduce nozzle changing frequency, cut refractory consumption and tundish downtime. Lower overall refractory cost per ton of steel.
✅ Supply capacity
Support bulk order and scheduled release. We can arrange regular stock for your commonly used sizes to shorten lead time.
✅ Compatibility
Our zirconia core fits most mainstream metering nozzle outer sleeves in the market. We can adjust outer taper and size to match your existing nozzle assembly.
✅ Safety & risk reduction
Low cracking rate reduces breakout risk and molten steel leakage accident in continuous casting line.
How to Contact Us
who choose us?
Share your drawing, bore size, steel grade, monthly consumption and target campaign time. We will give you matched solution and competitive quotation.
one-stop solution
professional team
high quality
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