Corundum-mullite castables are refractory products made of high-quality corundum and mullite as core materials. They have the characteristics of high temperature resistance, high mechanical strength, and good thermal shock resistance. They are suitable for high-temperature industrial occasions with high requirements.
| Item | KRGM-1 | KRGM-2 | KRGM-3 | |
|---|---|---|---|---|
| Al2O3 ≥ | 70 | 75 | 85 | |
| SiO2 ≤ | 25 | 17 | 13 | |
| Fe2O3 ≤ | 1 | 1 | 1 | |
| Bulk Density g/cm3 ≥ | 2.7 | 2.8 | 2.9 | |
| 0.2MPa Refractoriness Under Load ℃ ≥ | 1450 | 1480 | 1500 | |
| Thermal Shock Resistance, Times, (900℃, water-cooling) ≥ | 25 | 25 | 25 | |
| Maximum Service Temperature ℃ | 1550 | 1550 | 1600 | |
| Linear Dimensional Change % ≤ | -0.3 | -0.2 | -0.2 | |
| Cold Crushing Strength Mpa ≥ | 110℃*24h | 100 | 110 | 120 |
| 1100℃*3h | 100 | 110 | 120 | |
| 1400℃*3h | 115 | 120 | 125 | |
| MOR ≥ | 110℃*24h | 15 | 15 | 15 |
| 1100℃*3h | 16 | 17 | 18 | |
| 1400℃*3h | 17 | 18 | 19 | |
1.High Temperature Resistance; 2.Excellent Mechanical Strength; 3.Good Thermal Shock Resistance; 4.Low Thermal Expansion;
Corundum mullite castables are applied in steel – making furnaces to resist molten steel and slag corrosion. In glass – melting kilns, they endure high – temperature glass – making processes. They’re also used in cement rotary kilns to maintain structural stability under high – temperature and mechanical stress.