Tundish Refractory Solutions | Lining, Stoppers & Nozzles

Tundish Refractory Solutions: Zone-by-Zone Lining, Flow Control and Nozzles for Continuous Casting

A tundish refractory lining is the multi-layer refractory system inside the continuous casting tundish. It receives molten steel from the ladle, distributes it uniformly to the caster molds, and governs flow velocity, thermal retention, and metallurgical cleanliness. Beyond the refractory lining itself, the tundish relies on fluid flow-control ceramics including tundish impact pads and turbulence inhibitors, weir walls and dam blocks, thermal barriers including zoned tundish cover castables, precision stopper rods, and anti-clogging zirconia-core nozzles. We engineer and supply the complete package zone by zone, empowering your continuous caster to run extended multi-hour sequences with cleaner steel and zero flow-control disruptions.

How Is a Tundish Lining Structured?

Seven Core Components of the Modern Tundish Vessel

  • Steel Shell: Heavy structural casing engineered to support ferrostatic liquid steel pressure and crane transport.
  • Permanent Safety Lining: High-alumina dense castable or brick serving as the thermal safety barrier protecting the structural shell.
  • Working Lining: Magnesia dry vibration mass or spray coating in direct working contact with molten steel and active tundish slag.
  • Thermal Retention & Atmospheric Seal: Tundish cover castables (engineered insulating backup, dense hot-face, pour-box collar, and seal rim) preventing long-sequence temperature drift and atmospheric nitrogen pickup.
  • Primary Energy Dissipation & Flow Conditioning: Precast impact pads and turbulence inhibitors absorbing peak stream kinetic energy at ladle change and dampening fluid recirculation vortices.
  • Flow-Control Refractories: Ladle shroud, impact pad, and weirs and dams (precast dam blocks) optimizing fluid dynamics and promoting non-metallic inclusion flotation.
  • Flow Delivery Ceramics: Monolithic stopper rod, tundish nozzle seat block (well block), anti-clogging zirconia-core nozzles, upper nozzle, and Submerged Entry Nozzle (SEN) regulating liquid steel delivery into the mold.
Continuous Casting Tundish Refractory Lining Structure - Dry Vibratable Mix, Stopper Rod, and Nozzle Diagram

Continuous Casting Tundish Refractory Lining Structure — Dry Vibratable Mix, Stopper Rod, and Nozzle Diagram.

Which Refractory Works Best in Each Tundish Zone?

Zone Main Wear Mechanism Recommended Refractory Specification
Impact Pad & Turbulence Inhibitor Severe kinetic stream impact, fluid turbulence, slag churning Matched precast corundum-spinel impact pad & turbulence inhibitor assembly (see our Impact Pad & Inhibitor Guide)
Tundish Cover & Roof Long-sequence radiant heat loss, shroud splash erosion, atmospheric air ingress Four-zone castable system: dense hot face, insulating backup, pour-box collar & seal rim (see our Tundish Cover Castable Guide)
Working Lining (Walls and Bottom) Steel and slag contact, thermal shock, easy deskulling Magnesia dry vibration mass or spray coating (MgO 85–92%)
Slag Line Aggressive tundish flux and slag line erosion High-purity fused magnesia or resin-bonded MgO-C brick
Weirs and Dams (Dam Blocks) Molten steel flow erosion, thermal cycling, hole washout Precast high-alumina or low-cement corundum castable blocks
Ladle Shroud Kinetic erosion, thermal shock, air aspiration Isostatically pressed Al₂O₃-C body with ZrO₂-C slag line reinforcement
Stopper Rod Throttling erosion, thermal shock, tip wash Monolithic Al₂O₃-C body with erosion-resistant spinel or zirconia tip
Seat Block (Well Block) & Upper Nozzle Steel-flow abrasion, mechanical nozzle seating load High-alumina / corundum seat block, Al₂O₃-C upper nozzle
Tundish Metering Nozzle (Zirconia Core) Alumina inclusion clogging, bore restriction, casting speed decay Al₂O₃-C outer body with zirconia-core insert (ZrO₂ ≥ 95%) for non-wetting anti-clogging bore longevity (see our Tundish Nozzle Guide)
Submerged Entry Nozzle (SEN) Mold powder slag attack, alumina clogging, thermal fatigue Al₂O₃-C body with ZrO₂-C slag sleeve and anti-clogging inner liner
Permanent Safety Lining Thermal loss, safety barrier against metal breakthrough Dense low-cement high-alumina castable (Al₂O₃ ≥ 70%) or safety brick

How Can You Extend Tundish Life and Improve Steel Cleanliness?

Fluid Dynamic Flow Optimization & Dwell Time

Deploy engineered impact pads and turbulence inhibitors combined with weirs and dams to dampen incoming stream turbulence and maximize inclusion flotation dwell time.

High-Performance Working Lining Sintering Kinetics

Specify dry vibration mass for high bulk density, uniform curing, superior slag corrosion resistance, and fast deskulling turnaround.

Thermal Retention & Atmospheric Reoxidation Barriers

Seal the tundish bath with an engineered tundish cover castable lining and argon-shielded ladle shroud to eliminate temperature drift and nitrogen pickup.

Matched Flow Control Ceramics & Anti-Clogging Bores

Pair zirconia-core anti-clogging nozzles, well blocks, and SEN geometries to your steel grade chemistry to prevent nozzle constriction and maintain constant casting speeds.

Controlled Preheating Curves & Slag Line Care

Adhere to strict ramp-up preheating curves and perform intermediate gunning on high-wear slag lines between sequence heats.

Technical Procurement Specification Checklist for Tundish Linings

Caster Operational Profile & Strand Layout

Key Physical & Chemical Specification Matrix:

Standard Metallurgical Acceptance Checkpoints:
  • Tundish Capacity & Geometry: Working tonnage, bath depth, and internal volume drawings.
  • Strand Configuration: Number of strands and center-to-center nozzle spacing.
  • Caster Section: Billet, bloom, beam blank, or slab dimensions.
  • Target Sequence Duration: Continuous sequence length in hours and number of heats.
  • Steel Grade Spectrum: Carbon, low-alloy, SBQ, bearing, stainless, or electrical steels.
  • Historical Wear Data: Bottleneck wear zones and previous campaign failure locations.

Frequently Asked Questions: Tundish Refractory Solutions (FAQ)

What is a continuous casting tundish lining made of?

The system consists of a magnesia dry vibration mass or spray working lining backed by a high-alumina permanent safety lining. Flow-control components — including impact pads and turbulence inhibitors, weirs and dams, zoned tundish covers, stopper rods, well blocks, and zirconia-core nozzles — complete the integrated assembly.

How do zirconia-core tundish nozzles prevent alumina inclusion clogging during continuous casting?

During casting of aluminum-killed steels, suspended solid alumina particles sinter easily onto conventional carbon-bonded bore surfaces, choking throughput. Our zirconia-core tundish nozzles utilize high-density ZrO₂ inserts (≥95%) with exceptionally low molten-metal wettability, suppressing inclusion deposition, eliminating emergency oxygen lancing, and stabilizing strand speeds throughout long sequences.

Why does a tundish require precast weir walls and dam blocks?

The impact pad and turbulence inhibitor assembly absorbs kinetic energy from the ladle stream, while weirs and dams (dam blocks) direct liquid steel upward to promote inclusion flotation and equalize bath temperature. Explore our dedicated tundish weir wall & dam block flow-control solutions for custom angled hole pattern engineering and CFD flow modeling.

Why is the tundish cover design critical for steel cleanliness and sequence length?

During multi-hour continuous casting sequences, radiant heat loss through an uninsulated roof causes steel temperature drift, risking caster strand freezing. Furthermore, gaps along the cover perimeter or around SEN penetrations allow atmospheric air aspiration, causing nitrogen pickup and reoxidation inclusions. Implementing our four-zone tundish cover castable design stabilizes bath temperature and seals against secondary oxidation.

Should I choose dry vibration mass or spray coating for my tundish?

Dry vibration mass provides a denser, slag-resistant lining with rapid turnaround for clean steel and long sequence lengths. Spray coating offers rapid application for smaller shops. See our dedicated tundish dry vibrating mix, spray coating & gunning mix guide for technical data and mix formulations.

Do you supply complete turnkey tundish refractory packages?

Yes. We supply the complete flow-control and refractory package: working lining mass, impact pads and turbulence inhibitors, weirs and dams, tundish cover castables, stopper rods, seat blocks (well blocks), anti-clogging zirconia-core nozzles, upper nozzles, and submerged entry nozzles (SEN).

Related Continuous Casting & Steelmaking Solutions

Request a Tundish Refractory Proposal & Engineering RFQ

Contact YK Chanshine technical engineers for complete zone-by-zone refractory packages, custom CFD flow-control models, trial samples, and full turnaround quotations. Send your tundish capacity, strand count, casting sections, and target sequence duration.

Direct Engineering Email: sales@ykchanshine.com | Plant Line: +86-139-9807-2158