Refractories For Blast Furnace
Composite brown corundum brick
Al₂O₃ : 75
Bulk density : 3.0g/cm³
Apparent porosity : 18%
Cold crushing strength : 100 MPa
PRODUCT DESCRIPTION
Introduction
The composite brown corundum brick is made of brown corundum and silicon carbide as main raw materials, with special additives added, molded, finely ground after firing and delivered after preassembly. It balances mechanical strength, slag resistance and cost performance, widely used in high-temperature industrial furnace linings.
Features
Excellent volume stability: Low permanent linear change after high-temperature heating, less shrinkage or expansion, not easy to crack and deform during long-term operation.
Strong slag erosion resistance: Dense structure inhibits penetration of acidic and alkaline slag, outstanding corrosion resistance to molten ash and furnace slag.
Good thermal shock resistance: Moderate thermal expansion coefficient, capable of withstanding frequent temperature fluctuation without peeling and cracking.
Stable high-temperature performance: No softening collapse under long-term high temperature, reliable structural integrity for continuous furnace service.
Application
Steel industry: Heating furnace, soaking pit, ladle lining, tundish, regenerator of hot blast stove.
Cement industry: Preheater, rotary kiln upper zone, grate cooler lining.
Non-ferrous metallurgy: Reverberatory furnace, calcining furnace and holding furnace lining.
Power & waste incineration: Boiler furnace wall, flue and incinerator lining.
TECHNIQUE DATA
| Index | Composite brown corundum brick (FGY-78) | ||
| Standard | Typical | ||
| Al2O3, % | ≥ | 75 | 78.86 |
| SiC, % | — | ≥14 | 14.51 |
| Fe2O3, % | ≤ | 1.0 | 0.9 |
| Apparent porosity ，% | ≤ | 18 | 17 |
| Bulk density ，g/cm3 | ≥ | 3.0 | 3.05 |
| Cold crushing strength ，MPa | ≥ | 100 | 124 |
| 0.2MPa refractoriness under load0.2MPa ，℃ | ≥ | 1660 | 1700 |
| Linear change after reheating (1500∘C×2h) (1500∘C×2h), % | — | 0~+0.2 | +0.1 |
| Refractoriness ，℃ | ≥ | 1790 | >1790 |
| MOR ，MPa | ≥ | — | — |
| Thermal expansion coefficient (1000∘C), % | — | — | — |
| Thermal conductivity (940∘C) , W/m·k | ≤ | 6 | 4.86 |
| Thermal shock resistance (1100∘C water cooling, times) | ≥ | — | — |
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