CNC Quick Change Tundish Nozzle

The tundish nozzle is a critical consumable component in steel smelting and continuous casting production lines, used to control molten metal flow from tundishes, stabilize steel flow, and reduce inclusions and splatter. We offer a combination of metal seats paired with high-performance refractory ceramic/alumina-based nozzles, delivering wear resistance, thermal shock resistance, and fluid stability. These are suitable for continuous casting, precision casting, and various pouring systems.

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1. Materials

• For pouring carbon steel and low-alloy steel: We specialize in high thermal shock resistance zirconia composite nozzles. Featuring a gradient material design, the inner layer boasts high zirconia content for erosion resistance, while the outer layer incorporates reinforcing phases to prevent spalling and cracking. This ensures stable nozzle performance without fracturing during the extreme temperature fluctuations of initial pouring and ladle changeover phases.
• For pouring aluminum-killed steel and high-oxygen steel: This is a high-risk area for clogging. We offer calcium-treated liner nozzles or slit-type vent nozzles. The former continuously modifies alumina inclusions through active components in the material, preventing adhesion. The latter creates a barrier layer between the nozzle wall and molten steel via a micro-argon curtain, physically eliminating clogging. We can recommend the most cost-effective solution based on your steel's typical [Al] content and pouring time.
• Pouring Specialty Steels & High-Manganese Steels: Utilizing specialized zirconia and carbon composite materials, we reinforce against the unique corrosion mechanisms of high-manganese and highly erosive elements, resisting the "hole expansion" effect.

2. Structure

• Optimized Internal Flow Path: Our nozzle internal curvature is not a simple straight line or taper but is optimized based on fluid dynamics simulations. This stabilizes steel flow, minimizes turbulence and gas entrainment, thereby reducing secondary oxidation and mitigating impact on the mold surface.
• Precision-formed nozzle bowl: The bowl section contacting the stopper rod or slide plate is formed using isostatic pressing. This ensures dimensional tolerances within ±0.2mm, achieving first-time sealing success and eliminating steel flow instability or gas entrainment caused by improper closure.

3. The Foundation of Stability

• Starting with carefully selected mineral raw materials, composition and particle size adhere to fixed standards.
• Mixing and holding times are standardized to guarantee batch consistency.
• Critical components are fired in gas-fired shuttle kilns, where precise temperature curves ensure uniform sintering across every nozzle.

Our company designs a range of zirconia high-temperature products, including: - Zirconia nozzles for continuous casting in steelmaking, quick-change sizing nozzles, and ladle nozzles; - Zirconia slide plates and zirconia rings for converter pouring; - Calcium-stabilized zirconia nozzles and magnesium-stabilized zirconia nozzles for the powder metallurgy industry; and a series of other zirconia products suitable for high-temperature applications.

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