The Inner-Mounted Submerged Entry Nozzle (SEN) is a critical refractory component used in the continuous casting process of steelmaking. It is installed inside the tundish nozzle system and is designed to precisely control the flow of molten steel entering the mold. By stabilizing the molten steel stream and preventing oxidation, the inner-mounted SEN helps maintain steel cleanliness and ensures consistent casting quality.

Manufactured from high-quality Al₂O₃-C refractory materials or zirconia-graphite composites, the Inner-Mounted Submerged Entry Nozzle provides excellent resistance to thermal shock, molten steel corrosion, and slag erosion. Its advanced structural design minimizes turbulence in the mold and enables smooth, stable steel flow, making it suitable for high-speed continuous casting operations.

With precise machining and strict quality control, these nozzles deliver reliable performance, long service life, and improved steel quality, making them an essential component in modern steel plants.

Technical Specifications

Item	JSK55	JSK50	JSK45	JSK40
Al₂O₃ %	≥55	≥50	≥45	≥40
C %	≥16	≥18	≥20	≥22
Flexural Strength (MPa)	≥5.5	≥5.5	≥5.5	≥5
Apparent Porosity %	≤19	≤19	≤19	≤19
Bulk Density (g/cm³)	≥2.36	≥2.32	≥2.28	≥2.18

Key Features

Precise Molten Steel Flow Control: The inner-mounted structure ensures accurate control of molten steel entering the mold, maintaining stable casting conditions.
Excellent Thermal Shock Resistance: Manufactured with high-performance refractory materials that can withstand rapid temperature fluctuations during continuous casting.
Superior Corrosion and Slag Resistance: Resistant to chemical attack from molten steel and mold slag, ensuring long-lasting performance.
High Mechanical Strength: Strong structural integrity prevents cracking and deformation during high-temperature operation.
Extended Service Life: Optimized material composition and dense microstructure allow the nozzle to operate reliably for extended casting sequences.
Customizable Design: Available in various diameters, lengths, shapes, and material grades to match different tundish and mold configurations.

Typical Applications

The Inner-Mounted Submerged Entry Nozzle is widely used in various steel continuous casting operations, including:

Continuous casting of carbon steel
Low manganese steel casting
Aluminum-killed steel
High-quality alloy steels

Common casting formats include:

Billet casting
Bloom casting
Slab casting
Thin slab continuous casting

These nozzles are also used in steelmaking processes that require high steel cleanliness, stable molten steel flow, and reduced inclusion formation.

Production Details of Submerged Entry Nozzle

Xintai Refractory uses advanced isostatic pressing (CIP) technology to manufacture Inner-Mounted SENs, ensuring uniform density, minimal defects, and reliable performance.

Production Process:

Raw Material Mixing: High-purity alumina, graphite, zirconium, and antioxidants are blended.
Molding: Powder is filled into rubber molds and sealed in support boxes.
Isostatic Pressing: High pressure compresses the powder from all directions to form a dense green body.
Sintering: High-temperature firing strengthens the nozzle.
Mechanical Processing: Nozzles are machined to precise dimensions.
Quality Inspection: Each nozzle is tested for thermal shock resistance, porosity, density, and mechanical strength.

For enhanced slag resistance, the nozzle’s lower section can be lined with zirconium-graphite material.

Packing and Shipping Details

Packaging: Moisture-proof and shock-resistant wooden crates or pallets to ensure safe transportation.
Shipping: Available by sea, air, or land according to customer requirements.
Lead Time: Typically 3–4 weeks, depending on order quantity.
International Delivery: Secure export packaging and worldwide shipping available.

Frequently Asked Questions (FAQ)

Q1: What steel grades are suitable for Inner-Mounted SENs?

They are widely used for casting carbon steel, low manganese steel, aluminum-killed steel, and various alloy steels.

Q2: How do I choose the correct nozzle type?

Selection depends on factors such as steel grade, casting speed, mold size, tundish design, and operating conditions. Technical support can help determine the optimal design.

Q3. What types of Submerged Entry Nozzles are available?

Common types include: