Tundish Well Block — Nozzle Seat Support for Continuous Casting
A refractory component at the tundish outlet that holds the nozzle seat in position and seals the molten steel path.
FerrumX well blocks are produced from high-alumina and magnesia-carbon materials with ≥1790°C refractoriness and up to 30 thermal-shock cycles — supporting stable flow from tundish to mould across billet, bloom, and slab casters.
What it is
What a Tundish Well Block Is & Where It Is Used
The tundish well block is a refractory component used in the continuous casting of steel. It is installed in the outlet area of the tundish, where it supports and fixes the submerged entry nozzle or stopper nozzle assembly. The block holds the nozzle seat in position and forms the transition between the tundish lining and the nozzle.
FerrumX has supplied refractory components for steel continuous casting for more than 20 years. The Tundish Well Block is produced from high-performance refractory materials and is used on continuous casting lines ranging from small and medium mills to large multi-strand slab and bloom casters.
Technical Specifications
Technical Specifications
The Tundish Well Block is supplied against the physical and chemical values listed below. These values are the standard specification for the high-alumina and magnesia-carbon grades.
| Property | Value |
|---|---|
| Material | High Alumina, Magnesia-Carbon |
| Refractoriness | ≥ 1790 °C |
| Flexural Strength | ≥ 10 MPa |
| Bulk Density | 2.7–3.0 g/cm³ |
| Thermal Shock Resistance | ≥ 30 cycles (1100 °C – water quenching) |
| Service Life | Up to 15–30 casting heats |
Material grades
FerrumX supplies high-alumina and magnesia-carbon well blocks, with material selection matched to the casting process and required erosion resistance.
High-alumina grade
For general continuous casting service where high refractoriness and dimensional stability are required.
Magnesia-carbon grade
For service where resistance to molten steel and slag erosion is the priority.
Material & Manufacturing
Material & Manufacturing
The block is produced from high-purity high-alumina and magnesia-carbon refractory raw materials. In continuous casting practice, tundish well blocks are also produced from alumina-magnesia and alumina-magnesia-spinel compositions; in-spinel formation improves slag resistance and dimensional stability.
Manufacturing follows four controlled steps:
Proportioning
Raw materials are weighed and blended to a controlled mix design.
Molding
High-precision press forming holds the seat and fixing dimensions to close tolerance.
Sintering
High-temperature firing increases density and thermal shock resistance.
Inspection
Incoming materials and finished blocks are checked against specification before dispatch.
Applications
Applications Across Continuous-Casting Lines
Nozzle support and seat sealing
The well block forms the base of the tundish outlet and holds the nozzle assembly in place. It seals the nozzle seat against the tundish lining and keeps the molten steel path aligned, preventing leakage at the outlet.
Continuous casting of billets, blooms and slabs
The block is used on continuous casting lines that produce billets, blooms and slabs. It stays in contact with molten steel for the full casting sequence and keeps the flow stable from tundish to mold.
Multi-strand tundishes
On multi-strand casters, each outlet is fitted with its own well block and nozzle. Consistent block dimensions keep the nozzles aligned and support stable, balanced flow across all strands.
Clean and low-alloy steel grades
Where steel cleanliness and low inclusion content are required, the dense, low-porosity block limits molten steel contact with the surrounding refractory and helps keep the tundish flow controllable.
Retrofit and custom nozzle systems
The block is matched to the plant’s nozzle, slide gate and seat-brick arrangement. Custom dimensions and material selection are provided to fit existing tundish designs without altering the surrounding lining.
Quality & Support
Quality, Certifications & Engineering Support
FerrumX operates under ISO 9001 quality management and ISO 45001 occupational health and safety management systems. Production follows controlled procedures from raw material receipt through firing and final inspection.
Each production lot is recorded with its batch number, material grade, firing parameters and inspection results. This allows a finished block to be traced back to its raw materials and process records.
FerrumX provides material selection guidance and dimensional drawings based on the customer’s tundish design and casting practice, and supplies both standard and custom specifications.
FAQ
Tundish Well Block — Frequently Asked Questions
It is a refractory component installed at the outlet of a tundish in a continuous casting machine. It supports and fixes the nozzle assembly and forms the transition between the tundish lining and the nozzle.
It is installed in the outlet area at the bottom of the tundish, directly under the molten steel bath, where it holds the nozzle seat in position.
They are produced from high-purity high-alumina and magnesia-carbon refractory raw materials. Grade selection depends on the casting process and the required erosion resistance.
The standard high-alumina and magnesia-carbon grades have a refractoriness of at least 1790 °C, which keeps the structure stable during long continuous casting sequences.
The materials are densified by high-temperature sintering and graded to limit crack growth. The standard product passes at least 30 thermal cycles in the 1100 °C water-quench test.
In standard service the block lasts up to 15–30 casting heats, depending on steel grade, casting temperature and tundish practice.
Yes. Blocks are supplied to customer drawings and to standard tundish geometries, and material grade and size are selected to match the plant’s nozzle and seat-brick system.
The blocks are matched to submerged entry nozzles, stopper nozzles, slide gates and seat-brick arrangements used on billet, bloom and slab casters.
FerrumX operates under ISO 9001 quality management and ISO 45001 occupational health and safety management systems.
Each lot is recorded with batch number, material grade, firing parameters and inspection results, allowing a finished block to be traced to its raw materials and process records.
Get Started
Ready to Specify Your Tundish Well Block?
Send your tundish drawing, outlet geometry, material requirement and casting parameters (steel grade, casting temperature, sequence length) to FerrumX. The technical team reviews the application and returns a matched specification and lead time.
Related: Ladle Shroud · Tundish Nozzle · Stopper Rods · Nozzle Filling Compound · Slide Gate Plate · Trough & Runners Refractory
