Submerged Entry Nozzles for Bloom & Round Billet Caster

Submerged Entry Nozzles for Stable Bloom and Round Billet Continuous Casting

Submerged Entry Nozzles (SENs) are important functional refractory components used to transfer molten steel from the tundish into the mold during continuous casting.

For bloom and round billet casters, the SEN must provide reliable molten steel transfer while maintaining stable flow conditions, sufficient thermal shock resistance and resistance to erosion, corrosion and clogging.

Qingdao Dongye Refractory Material Co., Ltd. manufactures submerged entry nozzles for bloom and round billet continuous casting applications. We provide customized nozzle designs based on caster configuration, mold dimensions, steel grade, casting conditions and customer drawings.

What Is a Submerged Entry Nozzle?

A submerged entry nozzle is installed between the tundish and the mold during continuous casting.

The nozzle extends below the molten steel surface and provides a protected passage for molten steel from the tundish into the mold.

Its main functions are to:

· Transfer molten steel safely into the mold

· Reduce direct exposure of molten steel to the atmosphere

· Help prevent secondary oxidation

· Control the direction of molten steel flow

· Reduce excessive turbulence at the mold entrance

· Support stable continuous casting conditions

· Protect the casting process from uncontrolled steel-stream exposure

For bloom and round billet casting, nozzle design must be matched to the specific mold geometry and casting conditions.

Why SEN Performance Matters in Bloom and Round Billet Casting

Bloom and round billet casters can operate under different steel-flow and refractory-wear conditions depending on caster design, section size, steel grade and casting speed.

A submerged entry nozzle is exposed to molten steel and may also interact with slag and other aggressive materials.

If the nozzle is not properly selected, potential problems may include:

· Rapid internal-bore erosion

· Outlet-port enlargement

· Thermal cracking

· Nozzle clogging

· Unstable molten steel flow

· Excessive refractory wear

· Reduced casting sequence

· Steel cleanliness problems

For this reason, the correct SEN should be selected based on the complete casting condition rather than dimensions alone.

SENs for Bloom Casters

Bloom casting generally involves larger mold sections than conventional billet casting and may require a nozzle with an appropriate internal flow passage and outlet configuration.

For bloom casters, important design considerations can include:

· Bloom section dimensions

· Tundish capacity

· Casting speed

· Steel grade

· Casting temperature

· Nozzle immersion depth

· Internal bore diameter

· Outlet-port configuration

· Casting sequence

· Slag condition

The nozzle structure should provide an appropriate balance between steel-flow control and refractory service life.

SENs for Round Billet Casters

Round billet casting requires nozzle geometry that is compatible with the round mold and the required molten steel flow pattern.

The nozzle must be manufactured accurately to match the caster equipment and specified immersion position.

Depending on the casting process, design considerations can include:

· Round mold diameter

· Casting speed

· Steel grade

· Casting temperature

· Required casting sequence

· Nozzle bore diameter

· Outlet geometry

· Immersion depth

· Connection dimensions

Customized designs can be evaluated according to the customer’s existing equipment and process conditions.

Key Performance Features

1. Stable Molten Steel Flow

The internal bore and outlet geometry influence the velocity and direction of molten steel entering the mold.

A properly designed SEN helps maintain a controlled steel stream and reduce unnecessary flow disturbance.

For bloom and round billet casting, the nozzle geometry should be matched to the specific mold and casting parameters.

2. Thermal Shock Resistance

SENs experience severe thermal stress when exposed to molten steel.

Rapid heating during installation and the temperature difference between the refractory and molten steel can cause thermal shock.

A suitable refractory structure should therefore provide adequate thermal shock resistance to reduce the risk of cracking.

3. Erosion Resistance

Molten steel continuously passes through the internal bore and outlet areas.

Erosion can gradually change the bore and port geometry and affect the steel-flow characteristics.

Good erosion resistance helps maintain the designed flow passage throughout the required casting sequence.

4. Corrosion Resistance

The lower section of the SEN can be exposed to slag and other chemically aggressive materials.

The refractory composition should be selected according to the customer’s steel grade, slag conditions and required service life.

5. Resistance to Clogging

Clogging can restrict the internal flow passage or outlet ports and affect casting stability.

Nozzle clogging may be associated with steel chemistry, non-metallic inclusions, deoxidation products, temperature, refractory interaction and casting conditions.

Therefore, SEN material selection should be considered together with the customer’s steelmaking and casting process.

6. Dimensional Accuracy

A SEN must fit accurately with the tundish and mold system.

Important dimensions may include:

· Overall length

· Outer diameter

· Internal bore diameter

· Upper connection

· Lower outlet

· Port diameter

· Port angle

· Immersion length

· Sealing dimensions

Dongye can manufacture customized SENs according to customer drawings and confirmed technical specifications.

Refractory Materials for Bloom and Round Billet SENs

Different casting conditions require different refractory performance.

Depending on the application, alumina-carbon and other composite carbon-containing refractory systems can be considered for submerged entry nozzle production.

Material selection should take into account:

· Steel grade

· Molten steel temperature

· Casting speed

· Casting sequence

· Steel cleanliness requirements

· Tundish slag condition

· Mold powder condition

· Required service life

· Erosion and corrosion conditions

For demanding applications, different refractory characteristics can be designed for specific sections of the nozzle.

The final material composition should be confirmed according to the actual application rather than using a universal formulation for every caster.

How to Choose the Right SEN

When selecting a submerged entry nozzle for a bloom or round billet caster, we recommend reviewing the following information.

Caster Type

Confirm whether the nozzle will be used on a bloom caster, round billet caster or another continuous casting machine.

Mold Dimensions

Mold section size and geometry affect the required nozzle dimensions and steel-flow configuration.

Steel Grade

Steel chemistry and cleanliness requirements may influence refractory compatibility and clogging behavior.

Casting Speed

Casting speed affects the molten steel flow rate and the erosion conditions inside the nozzle.

Casting Temperature

Operating temperature influences thermal shock and chemical interaction between molten steel and refractory.

Casting Sequence

Long casting sequences place greater demands on erosion, corrosion and thermal shock resistance.

Existing Nozzle Problems

If your current SEN has problems such as:

· Frequent cracking

· Rapid bore erosion

· Outlet-port wear

· Clogging

· Slag-line corrosion

· Unstable steel flow

· Short service life

these problems should be included in the technical evaluation.

Understanding the failure mode can help determine whether the material, geometry, installation method or operating condition needs to be adjusted.

Customized SENs for Bloom and Round Billet Casters

Different continuous casting machines use different tundish structures, nozzle connections and mold dimensions.

Dongye supports customized SEN manufacturing according to customer requirements.

We can work from:

· Customer drawings

· Existing SEN samples

· Equipment dimensions

· Required nozzle dimensions

· Steel grade

· Casting temperature

· Casting speed

· Casting sequence

· Existing nozzle service-life data

· Current refractory failure problems

After reviewing the application information, our technical team can recommend a suitable material and structural configuration.

Manufacturing and Quality Control

Submerged entry nozzles directly affect molten steel flow and continuous casting stability. Consistent manufacturing quality is therefore essential.

Qingdao Dongye Refractory Material Co., Ltd. has independent R&D and quality-control capabilities, supported by production equipment, manufacturing technology and testing facilities.

Our manufacturing and quality-control process focuses on maintaining product consistency throughout production.

Depending on the confirmed specification, quality control can include:

· Raw material inspection

· Material formulation control

· Manufacturing-process control

· Dimensional inspection

· Visual inspection

· Physical-property testing

· Finished-product inspection

Customized products are manufactured according to the confirmed technical specification, customer drawing or approved sample.

Dongye’s Continuous Casting Refractory Capability

Qingdao Dongye Refractory Material Co., Ltd. is a professional manufacturer of functional refractories for the steel industry.

Our continuous casting refractory product range includes:

· Submerged entry nozzles

· Quick-exchange SENs

· Ladle shrouds

· Monoblock stoppers

· Tundish upper nozzles

· Long nozzles

· Zirconia sizing nozzles

The company integrates design, R&D, manufacturing, construction and international trade.

Dongye has supplied refractory products to dozens of medium and large steel enterprises in China, with products also exported to Europe, America and Southeast Asia.

The company also provides tundish refractory contracting services, giving our technical team practical experience with refractory products used throughout the continuous casting process.

Why Choose Dongye SENs?

Professional Functional Refractory Manufacturer

Dongye focuses on functional refractory products for steelmaking, continuous casting, precision casting and metal melting.

Application-Oriented Technical Support

We consider the relationship between nozzle material, nozzle geometry and actual casting conditions instead of selecting products based only on standard dimensions.

Customized Manufacturing

SENs can be manufactured according to customer drawings, samples and equipment requirements.

Independent R&D and Quality Control

Our independent R&D and quality-control capabilities support continuous improvement in refractory materials, manufacturing processes and product consistency.

Complete Continuous Casting Product Portfolio

Dongye manufactures multiple refractory components used in ladle, tundish and mold operations.

This allows us to evaluate SEN requirements as part of the complete continuous casting system.

International Supply Capability

Dongye products have been supplied to domestic steel enterprises and exported to customers in Europe, America and Southeast Asia.

Typical Applications

Dongye submerged entry nozzles can be customized for:

· Bloom continuous casting

· Round billet continuous casting

· Carbon steel casting

· Low-carbon steel casting

· Alloy steel casting

· Other continuous casting applications requiring protected molten steel transfer

The final nozzle specification should be determined according to the customer’s actual equipment and casting conditions.

Request a Customized SEN Solution

Looking for submerged entry nozzles for a bloom or round billet caster?

Send us your existing nozzle drawing, product dimensions or sample together with your casting parameters.

Our technical team can evaluate your application and recommend a suitable SEN material and design based on your caster configuration and operating conditions.

Qingdao Dongye Refractory Material Co., Ltd.

Professional manufacturer of functional refractories for steelmaking and continuous casting.

Contact us for a customized submerged entry nozzle solution and quotation.