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℃ (slag line 1700℃ and above) |
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.
Leave your details and we will reply within 24 hours about this product
Magnesia-alumina spinel castable is an alkaline monolithic refractory made of fused magnesia and alumina-magnesia spinel, offering excellent slag resistance and thermal shock resistance for steel ladle and hot metal ladle working linings.
Chemical composition MgO≥55%
Learn More →
Anhydrous taphole mud is made of corundum, silicon carbide and coke fines with resin binder for blast furnace taphole sealing. It sinters fast, plugs densely and resists molten iron and slag scouring, ideal for large and medium blast furnaces under high pressure.
Al₂O₃ content30%～45%
Learn More →
Alumina-magnesia ladle castable (Al2O3-MgO) with in-situ spinel formation offers excellent slag resistance, thermal shock resistance and longer service life, ideal for integral lining and repair of steel ladles.
Al2O3 content75%～85%
Learn More →
Tundish working lining castable (magnesia dry mix) features high MgO content, dry vibrating installation, fast baking and easy stripping, offering excellent erosion resistance for continuous casting tundishes.
MgO content≥ 90%
Learn More →
WeChat · 17513376789