Saint Gobain Performance Ceramics & Refractories, is the only company globally to have a range of 4 different grades of fused cast blocks, that offers that much flexibility in tackling customer needs and solves challenging situations for the hearth of reheating furnaces. Magmalox® preserves the quality of the rolled steel, homogenizes the temperature of the reheated products and avoid build-up and nodule formation and sources of rejects. It offers longest campaign without surface defects and roughness even worn hearth and optimize repair time.
Electro-Fused Magmalox® Products:
- Magmalox® RN
Alumina-zirconia-silica fusion cast refractory
Weak adherence of slag
Easily cleaned, hot or cold - Magmalox® DR
Alumina-zirconia-silica fusion cast refractory
Homogeneous structure
Avoid adherence of slag
Resistance to thermal shock
Easily cleaned, hot or cold - Magmalox® 550
Alumina-zirconia-silica fusion cast refractory
High wear resistance
Avoid adherence of slag
Easily cleaned, hot or cold - Magmalox® 555
High alumina fusion cast refractory
High wear resistance
High temperature resistance
Easily cleaned, hot or cold
Material Properties
Typical Chemical Analysis (%)
Typical Crystallographic Analysis (%)
Typical Physical Properties
| RN | DR | 550 | 555 | |
| Al203 | 73 | 73 | 73 | 95 |
| SiO2 | 19 | 19 | 6 | 0.5 |
| ZrO2 | 5.5 | 5.5 | 20.5 | |
| Na2O | 1.05 | 1.05 | 0.5 | 4.1 |
| Fe2O3 | 0.7 | 0.7 | <0.3 | <1 |
| CaO | 0.5 | 0.5 | <0.3 | <1 |
| TiO2 | 0.25 | 0.25 | <0.3 | <1 |
| RN | DR | 550 | 555 | |
| Corundum | 41 | 41 | 71 | 45 |
| Mullite | 39 | 39 | ||
| Zirconium Oxide | 5 | 5 | 20 | |
| B Alumina | 53 | |||
| Vitreous Phase | 15 | 15 | 9 | 2 |
| Units | Temperature | RN | DR | 550 | 555 | |
| Density in Block Form | g/cm3 | 3 | 2.9 | 3.55 | 3.17 | |
| Expansion | % | 1,150 °C | 0.8 | 0.8 | 0.9 | 0.95 |
| Thermal Conductivity | W/m.K | 1,250 °C | 4.6 | 3.1 | 9.2 | 6.5 |
| Hot Crushing Strength | MPa | 1,350 °C | 45 | 120 | 156 |
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