A ladle shroud, also known as a protective tube or pouring tube, is an Al₂O₃–C (alumina-carbon) refractory tube that connects the ladle (steelmaking furnace) to the tundish in continuous casting. It is one of the core components of the continuous casting process.

Installed at the ladle’s bottom nozzle, the ladle shroud creates a sealed channel that isolates the molten steel from air. It serves multiple critical functions: guiding the flow of molten steel, preventing secondary oxidation, and minimizing splashing. As a key functional refractory material, it enables protective casting to improve billet quality.

In continuous casting production, the performance and stability of the ladle shroud directly determine whether the entire process can run smoothly. A poorly designed or improperly selected ladle shroud may crack during casting, causing molten steel splashing and serious production accidents. It may also contaminate the steel with non-metallic inclusions due to material erosion.

Core Functions of the Ladle Shroud

The ladle shroud performs three critical roles in the continuous casting process:

• Flow Control: Transfers molten steel smoothly from the ladle to the tundish, stabilizing the flow pattern.
• Prevents Secondary Oxidation: Seals the molten steel from air, preventing the formation of oxide inclusions.
• Prevents Splashing: Reduces splashing during the pouring process, ensuring operational safety.

2026 Selection Guide: How to Choose the Right Ladle Shroud

Selection is not simply “buying a tube.” It requires precise matching based on steel grade, casting temperature, caster type, and site conditions. Here is our three-step selection guide:

Step 1: Choose the Material Based on Steel Grade and Conditions

• Plain Carbon Steel Casting: Use standard Al₂O₃-C (alumina-carbon) ladle shrouds for the best cost-performance ratio.
• Special Steel Grades (e.g., Al-killed steel, Si-deoxidized steel): Choose formulations with low SiO₂ content or special antioxidants to prevent carbon pick-up or Al₂O₃ clogging caused by carbon thermal reactions.
• High-Speed Continuous Casting: Select high-strength, high-density ladle shrouds to resist stronger molten steel erosion.

Step 2: Evaluate the Structural Design

• Straight vs. Trumpet Shape: A trumpet-shaped ladle shroud effectively reduces the outlet flow velocity, making the tundish liquid level more stable and reducing slag entrainment and level fluctuations. According to a 2023 study in the Journal of Iron and Steel Research, the trumpet-shaped ladle shroud can reduce the maximum outlet flow velocity from 1.3 m/s to 0.5 m/s, significantly improving the tundish flow field.
• Insulation Layer Design: Choose preheating-free ladle shrouds with a low thermal conductivity insulation layer composite inside the bore. This reduces thermal stress and minimizes heat loss.

Step 3: Verify Compliance and Supporting Services

In the domestic market, products must comply with YB/T 007 or relevant industry standards. Reputable suppliers should provide material test reports and physical property indicators (apparent porosity, bulk density, cold crushing strength, etc.) for each batch, along with usage recommendations.

Why Choose Us as Your Ladle Shroud Manufacturer?

In the continuous casting process, the ladle shroud is not an ordinary “tube.” It is a critical functional refractory material that directly affects billet quality.

As a professional ladle shroud manufacturer, we offer:

• Advanced Manufacturing: We use mature cold isostatic pressing (CIP) technology to ensure high density and uniform structure.
• Rigorous Quality Control: Every batch undergoes strict physical and chemical testing to meet international standards.
• Flexible Customization: We can produce ladle shrouds with special lengths, customized insulation layers, or composite slag line materials.
• Global Reach: Our products are trusted by steel mills worldwide, from China to Southeast Asia and the Middle East.

Don’t let the most critical component become the weak link in your casting process. Whether you need standard ladle shrouds or custom solutions for special conditions, we provide professional technical support and competitive pricing.