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High Alumina Refractory bricks |
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High alumina brick for blast .furnace are used in the part of throat, stack, hearth and its temperayure of refractoriness under load is normally above 1420~1550 ℃ that is higher than the clay brick.
High alumina brick for blast furnace are of very good ablity of anti-acidity, anti-metal fluid corrode and anti-oxidation.
| Al2O3 % Min. |
55 |
65 |
75 |
58 |
55 |
| SiC % Min. |
|
|
|
5 |
4 |
| C % Min. |
|
|
|
14 |
12 |
| Fe2O3 % Max. |
2.0 |
2.0 |
2.0 |
|
|
| Refractoriness ℃ Min. |
1770 |
1790 |
1790 |
|
|
| Apparent Porosity % Max. |
19 |
19 |
19 |
13 |
15 |
| Refractoriness under Load 0.2MPa ℃ Min. |
1480 |
1500 |
1550 |
1630 |
1600 |
| Cold Crushing Strength MPa MPa Min. |
49 |
58.8 |
60 |
30 |
25 |
| Permanent Linear Change % |
1450℃x2h |
|
|
|
|
|
| 1500℃x2h |
0~- 0.2 |
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|
| Modulus of Rupture MPa Min. |
|
|
|
12 |
9 |
| Bulk Density g/cm3 Min. |
|
|
|
2.5 |
2.5 |
| Coefficient of average line expansion (1000℃) |
|
|
|
2.4x10-6 |
2.4x10-6 |
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Refractory Products