Magnesia castable is made from sintered magnesia as aggregate and fines, offering high MgO content, strong resistance to basic slag and high refractoriness. It is ideal for steel ladle slag lines, LF refining furnaces and tundishes.
| MgO content | ≥ 85% |
|---|---|
| CaO content | 5%～8% |
| Bulk density | ≥ 2.8 g/cm³ |
| CCS (110℃×24h) | ≥ 20 MPa |
| CCS (1500℃×3h) | ≥ 45 MPa |
| MOR (1500℃×3h) | ≥ 6 MPa |
| Refractoriness | ≥ 1770℃ |
| Service temperature | ≥ 1650℃（渣线可至 1700℃以上） |
Magnesia castable is a high-magnesia basic unshaped refractory made from sintered (or fused) magnesia as aggregate and fines, bonded with polyphosphate, magnesium sulfate or sodium silicate binders. With high MgO content and low impurities, it reacts with basic slag to form high-melting-point compounds, giving significantly better slag resistance than alumina-silica materials. It is the preferred unshaped refractory for basic service conditions such as steel ladle slag lines, ladle refining furnaces and tundishes.
The slag line is exposed to high-basicity slag; alumina-silica materials are easily attacked. MgO in magnesia castable reacts with CaO and Fe₂O₃ in slag to form high-melting spinel-type minerals, creating a dense protective layer that significantly extends slag line life.
Choose by slag system and conditions: magnesia (basic) castable for basic slag and high-temperature steelmaking; high alumina material for neutral or acidic conditions. Wrong material selection accelerates erosion.
Standard grades serve at ≥ 1650°C; slag line and other high-temperature parts can be customized above 1700°C.
Yes. Henan Songrui New Refractory Materials Co., Ltd. supports custom magnesia castable formulations by steel grade, slag basicity, ladle life target and installation method, with on-site technical guidance.
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