Body/Tube: Outer Diameter 80-200 mm, Length 600-1200 mm

Q: What is the primary function of the Body/Tube in a Submerged Entry Nozzle?

It serves as the main conduit that directs molten steel from the tundish into the mold while submerged below the steel surface to prevent oxidation and control flow patterns.

Q: Why are refractory materials used for the Body/Tube?

Refractory materials withstand extreme temperatures (up to 1600°C), resist chemical erosion from molten steel, and provide thermal shock resistance during rapid temperature changes.

Q: How does the Body/Tube affect steel quality?

Proper design prevents turbulence, minimizes inclusions, controls solidification patterns, and reduces nozzle clogging - all critical for producing high-quality steel with minimal defects.

Component Specifications

Definition

The Body/Tube is the primary cylindrical component of a Submerged Entry Nozzle (SEN) used in continuous casting of steel. It serves as the conduit through which molten steel flows from the tundish into the mold, submerged below the mold's meniscus to prevent oxidation and control flow dynamics. Its geometry and material properties are critical for maintaining steel quality, preventing nozzle clogging, and ensuring uniform solidification in the mold.

Working Principle

The Body/Tube operates by creating a sealed, refractory-lined channel that directs molten steel under controlled flow conditions. It utilizes the principle of submerged pouring to minimize turbulence, prevent air entrapment, and reduce reoxidation of the steel. The internal bore geometry (typically tapered or straight) controls flow velocity and distribution, while external features may include flanges for connection and ports for argon injection to prevent clogging.

Materials

High-alumina refractory materials (70-85% Al2O3), often with zirconia or graphite additives for thermal shock resistance and erosion protection. Common grades include fused silica-alumina composites or isostatically pressed alumina-graphite. Material must withstand temperatures up to 1600°C and resist chemical attack from molten steel and slag.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	600-1200 mm
Erosion Rate	<1 mm per heat
Outer Diameter	80-200 mm
Wall Thickness	15-40 mm
Inner Bore Diameter	30-100 mm
Operating Temperature	1500-1600°C
Thermal Shock Resistance	≥20 cycles (water quench test)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 10049, DIN 51060

Parent Products

This component is used in the following industrial products

Submerged Entry Nozzle (SEN)

A refractory component that directs molten steel from the tundish into the mold while submerged below the metal surface.

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Thermowells

Thermowells are cylindrical protective tubes installed in jacketed cooling/heating systems to isolate temperature sensors (thermocouples, RTDs) from the process fluid while allowing accurate temperature measurement.

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Engineering Analysis

Risks & Mitigation

Thermal cracking from rapid temperature changes
Erosion from molten steel flow
Clogging from alumina buildup
Mechanical failure under thermal stress

FMEA Triads

Trigger: Thermal shock during preheating or casting start
Failure: Cracking or spalling of refractory lining
Mitigation: Controlled preheating procedures, use of thermal shock-resistant materials, proper storage to prevent moisture absorption

Trigger: High-velocity molten steel flow
Failure: Erosion of inner bore surface
Mitigation: Optimized bore geometry, erosion-resistant refractory materials, controlled casting speed

Trigger: Alumina inclusions in molten steel
Failure: Nozzle clogging and restricted flow
Mitigation: Argon injection through porous plugs, steel cleanliness control, optimized refractory composition

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±1.5 mm on critical dimensions, ±0.5° on angular alignment

Test Method

Dimensional inspection per ISO 10049, thermal shock testing per DIN 51060, chemical analysis of refractory composition

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Body/Tube

Manufacturer profiles associated with Body/Tube.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of the Body/Tube in a Submerged Entry Nozzle?