What matching slide gate plate works with metering nozzle?

Metering nozzles (zirconia tundish sizing nozzles) and slide gate plates form the core flow control set for continuous casting tundishes. Mismatched material, dimension or structural design will cause molten steel leakage, uneven flow, plate abrasion and shortened service life.  Changtai shares professional matching standards and selection guidance for metallurgical purchasers and steel plant technical teams.

 

 

The matching between slide gate plate and metering nozzle covers three key dimensions: dimensional tolerance, material compatibility and operating condition adaptability.

Precise dimensional coordination: The through-hole diameter, outer contour and installation interface of the slide plate must match the metering nozzle. Poor fit leads to clearance steel penetration and surface scratch during sliding movement.

Consistent thermal performance: Similar thermal expansion coefficient avoids gap expansion or extrusion cracking under high temperature.

Chemical compatibility: Materials shall not react violently with molten steel and tundish slag to prevent local erosion and spalling.

 

 

1. Alumina-carbon (Al₂O₃-C) Slide Gate Plate

Matching object: Standard zirconia metering nozzles for carbon steel, low-alloy steel continuous casting

Advantages: Balanced thermal shock resistance, moderate cost, stable sliding performance.

Suitable working conditions: Conventional billet and slab casting, normal casting sequence.

Changtai tip: Widely used for general steel grades, supports stable cooperation with conventional composite metering nozzles.

2. Alumina-zirconia-carbon (Al₂O₃-ZrO₂-C) Slide Gate Plate

Matching object: Metering nozzles for medium-high alloy steel, calcium-treated steel

Advantages: Higher anti-erosion capacity against aggressive molten steel and corrosive slag, longer service life.

Suitable working conditions: Multi-heat continuous casting, high cleanliness steel production.

Changtai solution: Preferred matching combination when tundish slag has strong erosion.

3. Zirconia-inlaid Composite Slide Gate Plate

Matching object: High-purity stabilized zirconia metering nozzles for high-grade steel

Advantages: Zirconia working area greatly improves scour resistance at the flow channel, low steel adhesion.

Suitable working conditions: Long sequence continuous casting, stainless steel and special alloy casting.

Highlight from Changtai: The optimal matching set for full zirconia metering nozzles to maximize overall service life of the flow control system.

 

 

1. Confirm the nominal bore diameter of metering nozzle; the plate hole shall maintain matched tolerance to avoid eddy current inside molten steel flow.
2. Unify outer mounting size: Customize slide plate outline according to tundish sliding mechanism and nozzle outer dimension.
3. Match material grade: Do not pair high-zirconia metering nozzle with ordinary low-grade alumina-carbon plates.
4. Verify preheating process: Different material combinations require matched baking curve to prevent thermal cracking.

 

 

• Mistake 1: Only focus on inner hole size while ignoring overall installation outline → nozzle offset and steel breakout risk.
• Mistake 2: Mix low-grade slide plates with full-zirconia metering nozzles → uneven abrasion, premature plate failure.
• Mistake 3: Use parts from different manufacturers without pre-matching test → inconsistent flatness, poor sealing during sliding.

 

 

 

As a professional manufacturer of tundish functional refractories, Anyang Changtai Silicon Co., Ltd. provides one-stop matched sets of metering nozzles and slide gate plates. All products can be customized in dimensions and materials according to customers' tundish equipment and casting steel grades.