镁铝砖（QML）以MgO含量90-97%的优质镁砂配加优质矾土制成，制品基质中形成高温相尖晶石结合，高温性能好，热震稳定性高。广泛应用于炼钢平炉、有色冶金炉等。
Magnesia-alumina brick(QML) is made of high quality magnesia combined with high quality bauxite.High temperature phase spinel combination is formed in the matrix of the products,which ensures excellent high temperature performance and high thermal shock stablity. It is widely used for steel making open-hearth furnace and non-ferrous metallurgical furnace etc..
| 项目Item | 镁铝砖 MgO-Al2O3 |
中档镁铝砖 MgO-Al2O3 |
高纯镁铝砖 MgO-Al2O3 |
镁铝尖晶石砖 MgO-Al2O3 |
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| ML-80A | ML-80B | MLG-90 | ML-90 | ML-85 | MLQ-90 | |
| MgO(%)≥ | 80 | 80 | 85-90 | 90 | 85 | 90-80 |
| Al2O3 (%) | 5-10 | 5-10 | 6-8 | 4-8 | 4-8 | 9-18 |
| 显气孔率(%)≤ Apparent porosity |
18 | 20 | 18 | 18 | 19 | 17 |
| 常温耐压强度(Mpa) ≥ Cold crushing strength |
39.2 | 29.4 | 50 | 45 | 40 | 40 |
| 0.2 Mpa荷重软化开始点℃≥ 0.2 Mpa refractoriness under load |
1600 | 1580 | 1650 | 1680 | 1630 | 1620 |
| 热震稳定性（Time）≥ Thermal shock stability |
3 | 3 | 3 | 3 | 3 | 10 |
