Magnesita Refractories: Optimized Installation Process for Tundish Linings

Key Requirements for Magnesia-Based Dry Vibratable Materials

Material Composition and Temperature Guidelines

Magnesita refractories utilize a hybrid binder system combining organic and inorganic agents. To preserve binding integrity during installation:

• Permanent layer temperature must stay below 100°C (lower preferred)
• Working layer thickness: 40-50mm for bottom, 45-60mm for walls (55mm minimum at slag line)
• Minimum operational lifespan: 12 hours under continuous casting conditions

Step-by-Step Installation Process

Preparation and Base Layer Formation

When using magnesita refractories:

1. Install impact pads and nozzle blocks with compacted ramming mix
2. Spread dry material evenly across tundish bottom (40-50mm)
3. Position and align forming mold with 45-60mm clearance from permanent walls

Vibration Process and Curing Protocol

Advanced vibration techniques ensure optimal density:

• Layer-by-layer filling with 3-5min vibration cycles
• Low-temperature curing at 200-250°C for 60-90 minutes
• Controlled cooling to below 100°C before demolding

Post-Installation Procedures

Quality Inspection and Final Assembly

After demolding magnesia-based linings:

1. Check for surface defects (cracks ≥2mm require repair)
2. Install flow control components with precision alignment
3. Backfill joints with matching dry vibratable material

Optimized Baking Curve for Magnesita Refractories

Thermal Treatment Guidelines

Proper baking ensures maximum performance:

• Initial phase: ≤800°C for 30 minutes (ramp rate: 15°C/min)
• Final phase: 1100°C peak (minimum 70 minutes dwell)
• Total bake time: 70-180 minutes (avoid over-firing)

Carbon Preservation Strategies

To maintain erosion resistance in magnesita refractories:

1. Limit total thermal exposure time
2. Use controlled atmosphere during baking
3. Monitor organic binder degradation points

Why Choose Magnesita Refractories?

Performance Advantages

• 15-20% longer campaign life vs conventional materials
• Reduced breakout risk through precise thermal expansion control
• Lower inclusion rates in final steel product

Maintenance Best Practices

Extend service life of magnesia-based linings:

1. Implement post-casting inspection routines
2. Use laser profiling for wear measurement
3. Schedule preventive repairs at 8-10 hour intervals

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