Porous Purging Plug for Steelmaking Ladle is a specialized gas-permeable refractory component designed for introducing inert gas into molten steel during ladle refining and secondary metallurgy. Installed in the bottom of a steelmaking ladle, the porous working section allows gas to pass through the refractory structure and enter the molten steel in a controlled manner.
The porous structure is an important part of the purging system. Its carefully controlled permeability helps distribute gas through the molten steel while maintaining the structural integrity required for high-temperature operation. During refining, the rising gas bubbles create circulation within the ladle, helping promote molten steel mixing and interaction between the steel and slag.
A properly designed porous purging plug can support more uniform gas distribution and stable stirring performance. It is therefore suitable for steelmaking operations where controlled gas purging is required before continuous casting or other downstream processes.
Xintai manufactures porous purging plugs using high-performance refractory materials selected for resistance to high temperatures, thermal shock, molten steel and slag. Different material grades are available for different operating conditions. The dimensions, installation structure and refractory composition can also be customized according to ladle design, operating conditions and customer drawings.
Technical Specifications
| Item | T-80 | T-85 | X-85 | M-85 | Z-85 |
|---|---|---|---|---|---|
| Al₂O₃ Content (%) | ≥ 80 | ≥ 85 | ≥ 85 | ≥ 85 | ≥ 85 |
| Al₂O₃ + Cr₂O₃ + MgO (%) | ≥ 92 | ≥ 92 | ≥ 90 | ≥ 92 | ≥ 92 |
| Bulk Density (g/cm³) | ≥ 2.3 | ≥ 2.4 | ≥ 2.5 | ≥ 2.4 | ≥ 2.5 |
| Rupture Strength (MPa) | ≥ 10 | ≥ 12 | ≥ 14 | ≥ 12 | ≥ 15 |
| Thermal Shock Resistance (T₁) | 1650°C | 1680°C | 1700°C | 1680°C | 1680°C |
| Air Permeability (cm³/s) | ≤ 0.2 | ≤ 0.1 | ≤ 0.1 | ≤ 0.1 | ≤ 0.1 |
Key Features
- Controlled Porous Structure: The refractory working section is manufactured with a controlled porous structure to provide reliable gas permeability. This allows inert gas to pass through the plug during molten steel treatment.
- Stable Gas Distribution: A properly engineered porous structure helps maintain consistent gas passage and supports uniform gas distribution into molten steel during ladle refining.
- High Temperature Resistance: The refractory material is designed for severe steelmaking environments and can withstand high operating temperatures during ladle filling, refining and casting preparation.
- Excellent Thermal Shock Resistance: The purging plug experiences repeated heating and cooling cycles. Its refractory structure is designed to resist thermal shock and maintain performance during demanding operating conditions.
- High Mechanical Strength: The refractory body provides the mechanical strength required to withstand installation, ladle operation and thermal stress while maintaining the integrity of the gas-permeable section.
- Resistance to Molten Steel and Slag: Selected refractory compositions provide resistance against contact with molten steel and slag, helping extend the working performance of the purging plug.
- Custom Manufacturing: The overall dimensions, working section, connection structure and other design parameters can be manufactured according to customer drawings and ladle specifications.
Typical Applications
- Steelmaking Ladles: The porous purging plug is installed at the bottom of steelmaking ladles to introduce inert gas into molten steel during refining operations.
- Ladle Refining: During ladle refining, controlled gas flow promotes circulation and mixing within the molten steel. This supports temperature equalization and the refining process.
- Secondary Metallurgy: The plug is suitable for secondary steelmaking applications where gas stirring is used to improve molten steel treatment and prepare the steel for casting.
- Molten Steel Stirring: Gas passing through the porous refractory structure produces bubbles that rise through the molten steel and generate circulation. This helps improve mixing throughout the ladle.
- Continuous Casting Preparation: Before molten steel is transferred to continuous casting equipment, gas purging can be used to help achieve more uniform molten steel conditions.
- Refractory Ladle Systems: The product can be incorporated into different ladle refractory systems and customized to match specific installation dimensions and structural requirements.
Production Details
Xintai manufactures porous purging plugs through a controlled refractory production process. Selected refractory raw materials are prepared, proportioned and mixed according to the required material grade.
The mixture is then formed into the specified plug structure using controlled molding processes. Drying and high-temperature firing are carried out to develop the required refractory strength, density and thermal properties.
Particular attention is given to the gas-permeable working section. The pore structure and permeability characteristics are controlled to meet the specified air permeability requirements while maintaining sufficient mechanical strength.
Finished products undergo quality inspection covering chemical composition, bulk density, rupture strength, thermal shock resistance and air permeability.
For customized products, manufacturing parameters can be adjusted according to customer drawings, ladle dimensions, gas flow requirements and working conditions.
Packing and Shipping Details
- Packaging: Each porous purging plug is carefully protected with moisture-resistant and impact-resistant packaging.
- Pallet Packing: Wooden pallets or heavy-duty crates can be used according to order quantity and shipping requirements.
- Product Protection: Additional protective materials can be added to protect the porous refractory section from impact during transportation.
- Shipping: Sea freight, air freight and land transportation are available.
- Lead Time: Standard orders generally require approximately 3–4 weeks, depending on specifications, quantity and production schedule.
- International Shipping: Customized packaging and transportation arrangements are available for overseas steel plants, refractory distributors and industrial buyers.
Frequently Asked Questions (FAQ)
Q1: What is a porous purging plug?
A porous purging plug is a gas-permeable refractory component installed at the bottom of a steelmaking ladle. Its porous working section allows inert gas to pass into molten steel during refining.
Q2: How does a porous purging plug work?
Gas enters the plug from the gas supply system and passes through interconnected pores in the refractory working section. It then enters the molten steel as bubbles, generating circulation and stirring inside the ladle.
Q3. What is the purpose of air permeability in a purging plug?
Air permeability indicates how easily gas can pass through the porous refractory structure. Controlled permeability is important for achieving stable and predictable gas flow during steelmaking operations.
Q4: What gas is normally used with a porous purging plug?
Argon is commonly used for molten steel purging. The appropriate gas flow rate and pressure depend on the ladle size, steel grade and refining process.
Q5: Can the porous purging plug be customized?
Yes. Xintai can customize dimensions, installation structure and other design parameters according to customer drawings and ladle requirements.
