Industry-Verified Manufacturing Data (2026)

Submerged Entry Nozzle (SEN)

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Submerged Entry Nozzle (SEN) used in the Basic Metal Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Submerged Entry Nozzle (SEN) is characterized by the integration of Flange and Body/Tube. In industrial production environments, manufacturers listed on CNFX commonly emphasize Alumina-graphite refractory construction to support stable, high-cycle operation across diverse manufacturing scenarios.

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

Product Specifications

Technical details and manufacturing context for Submerged Entry Nozzle (SEN)

Definition
The Submerged Entry Nozzle (SEN) is a critical refractory component in continuous casting systems that connects the tundish to the mold. It serves as a conduit for molten steel, directing the flow from the tundish into the mold while being submerged below the metal surface to prevent oxidation, minimize turbulence, and control the flow pattern within the mold.
Working Principle
The SEN operates by creating a submerged, controlled flow of molten steel from the tundish into the mold. Its submerged position prevents air entrapment and oxidation of the steel. The nozzle's internal geometry and port design (typically side ports or bottom ports) control the flow velocity, direction, and pattern within the mold, promoting uniform solidification and minimizing surface defects in the cast product.
Common Materials
Alumina-graphite refractory, Zirconia-graphite refractory, Fused silica refractory
Technical Parameters
  • Inner diameter, outer diameter, length, and port dimensions (height, width, angle) that determine flow characteristics and compatibility with casting parameters. (mm) Per Request
Components / BOM
  • Flange
    Connects the SEN to the tundish outlet and provides sealing
    Material: Refractory material with steel reinforcement
  • Body/Tube
    Main conduit that carries molten steel from tundish to mold
    Material: Alumina-graphite or zirconia-graphite refractory
  • Ports/Outlets
    Discharge openings that direct molten steel flow into the mold with controlled pattern
    Material: Wear-resistant refractory material
Engineering Reasoning
0.1-0.3 bar positive pressure differential between tundish and mold, 0.5-1.5 m/s molten steel velocity at nozzle exit
Alumina buildup exceeding 2 mm thickness on bore surface, thermal gradient exceeding 150°C/cm across refractory thickness, erosion depth exceeding 15% of original wall thickness
Design Rationale: Alumina deposition from steel deoxidation reactions (4Al + 3O₂ → 2Al₂O₃) at 1550-1600°C, thermal stress from cyclic heating/cooling (coefficient of thermal expansion mismatch between zirconia-graphite layers), turbulent flow erosion at Reynolds numbers >4000
Risk Mitigation (FMEA)
Trigger Insufficient argon gas injection (<2 L/min) through porous SEN walls
Mode: Clogging from alumina accumulation in nozzle bore
Strategy: Optimized argon injection system with pressure feedback control (maintain 0.15-0.25 bar backpressure)
Trigger Thermal shock from casting interruption exceeding 120 seconds
Mode: Longitudinal cracking along zirconia-graphite interface
Strategy: Controlled preheating protocol (ramp rate <100°C/hour to 1100°C) with embedded thermocouples

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Submerged Entry Nozzle (SEN).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 0.5 bar (primarily hydrostatic pressure from tundish height)
flow rate: 1-6 tons/min (typical continuous casting throughput)
temperature: 1500-1600°C (typical steel casting range)
slurry concentration: Not applicable (handles pure molten steel, not slurries)
Media Compatibility
✓ Molten carbon steel ✓ Molten stainless steel ✓ Molten low-alloy steel
Unsuitable: Molten aluminum or copper alloys (different thermal/chemical properties)
Sizing Data Required
  • Required steel throughput (tons/hour)
  • Mold dimensions (width/thickness)
  • Tundish nozzle bore diameter

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal fatigue cracking
Cause: Cyclic thermal stresses from rapid temperature changes during casting sequences, leading to crack initiation and propagation in the refractory material.
Clogging and alumina buildup
Cause: Accumulation of deoxidization products (primarily alumina) inside the nozzle bore due to turbulent flow and chemical reactions with molten steel, restricting flow and altering stream characteristics.
Maintenance Indicators
  • Visible cracks or spalling on the SEN exterior surface during visual inspection
  • Abnormal steel flow patterns or splashing during casting, audible as irregular pouring sounds
Engineering Tips
  • Implement controlled preheating protocols to minimize thermal shock during SEN installation and startup, maintaining temperature gradients within refractory limits
  • Optimize argon gas injection parameters (flow rate, distribution) to create protective gas films that reduce alumina adhesion and improve flow dynamics

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality management systems ASTM A297/A297M - Standard Specification for Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application EN 10204:2004 - Metallic products - Types of inspection documents
Manufacturing Precision
  • Bore diameter: +/-0.05mm
  • Surface flatness: 0.1mm per 100mm length
Quality Inspection
  • Dye Penetrant Testing (DPT) for surface defects
  • Ultrasonic Testing (UT) for internal integrity

Factories Producing Submerged Entry Nozzle (SEN)

Verified manufacturers with capability to produce this product in China

✓ 97% Supplier Capability Match Found

P Project Engineer from Canada Feb 06, 2026
★★★★★
"Testing the Submerged Entry Nozzle (SEN) now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
S Sourcing Manager from United States Feb 03, 2026
★★★★★
"Impressive build quality. Especially the technical reliability is very stable during long-term operation."
Technical Specifications Verified
P Procurement Specialist from United Arab Emirates Jan 31, 2026
★★★★★
"As a professional in the Basic Metal Manufacturing sector, I confirm this Submerged Entry Nozzle (SEN) meets all ISO standards."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

16 sourcing managers are analyzing this specification now. Last inquiry for Submerged Entry Nozzle (SEN) from UAE (19m ago).

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Frequently Asked Questions

What is the primary function of a Submerged Entry Nozzle (SEN) in steel manufacturing?

The SEN directs molten steel from the tundish into the mold while submerged below the metal surface, controlling flow and preventing oxidation during continuous casting.

What are the advantages of alumina-graphite refractory materials for SEN construction?

Alumina-graphite offers excellent thermal shock resistance, erosion resistance against molten steel, and good mechanical strength at high temperatures.

How does SEN design affect steel quality in continuous casting?

Proper SEN design with optimized ports/outlets ensures uniform steel flow, minimizes turbulence, reduces inclusions, and improves surface quality of cast steel products.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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