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Corundum castable is a high-performance refractory material manufactured using fused corundum or sintered corundum as the main raw materials, combined with high-purity ultrafine powders, composite binders, and additives. Its key characteristics include extremely high refractoriness exceeding 1750 °C, excellent mechanical strength at both ambient and elevated temperatures, and outstanding resistance to chemical corrosion. It effectively resists erosion from acidic and alkaline melts as well as corrosive gases.
The material also exhibits excellent high-temperature volume stability and thermal shock resistance, and is not prone to deformation or spalling during high-temperature service. It offers flexible installation methods: after mixing with water, it can be cast or applied by shotcreting, with rapid strength development after curing.
Overall, its comprehensive performance is far superior to that of conventional high-alumina castables, making it suitable for extremely harsh high-temperature operating conditions.
This material is widely used in metallurgy, building materials, petrochemical industries, and other high-temperature fields.
In the metallurgical industry, it is used as a critical lining material for electric furnace roofs, ladle working linings, and tundish permanent linings.
In the building materials industry, it is suitable for regenerator checkerwork of glass furnaces and burning zones of cement rotary kilns.
In the petrochemical industry, it is applied to linings of high-temperature equipment such as cracking furnaces and reforming furnaces.
In addition, it can also be used for special high-temperature furnace linings in aerospace, military, and other advanced applications, meeting the service requirements of ultra-high temperatures and severe corrosion environments.
Index | Unit | Corundum castable Series | ||||||
CT GY-90 | CT GY-94 | CT GY-95 | CT GGY-3 | CT GGY-5 | CT GGY-10 | |||
Al2O₃ | % | ≥90 | ≥94 | ≥95 | ≥80 | ≥80 | ≥80 | |
Cr2O3 | % | _ | _ | _ | ≥3 | ≥5 | ≥10 | |
Fe2O3 | % | ≤1.0 | ≤1.0 | ≤1.0 | ≤1.0 | ≤1.0 | ≤1.0 | |
Bulk density ≥ | g/cm³ | ≥2.90 | ≥2.90 | ≥2.90 | ≥3.0 | ≥3.0 | ≥2.9 | |
porosity | % | ≤16 | ≤16 | ≤16 | ≤16 | ≤16 | ≤16 | |
Modulus of rupture ≥ | 110℃*24h | MPa | ≥8 | ≥8 | ≥8 | ≥8 | ≥8 | ≥8 |
1100℃*3h | ≥8 | ≥8 | ≥8 | ≥8 | ≥8 | ≥8 | ||
1550℃*3h | ≥12 | ≥12 | ≥12 | ≥10 | ≥10 | ≥10 | ||
Cold crushing strength ≥ | 110℃*24h | MPa | ≥70 | ≥70 | ≥70 | ≥70 | ≥70 | ≥70 |
1100℃*3h | ≥70 | ≥80 | ≥80 | ≥90 | ≥90 | ≥90 | ||
1550℃*3h | ≥90 | ≥100 | ≥100 | ≥90 1400℃*3h | ≥90 1400℃*3h | ≥90 1400℃*3h | ||
Reheating linear change | 1100℃*3h | % | ±0.3 | ±0.3 | ±0.3 | ±0.5 | ±0.5 | ±0.5 |
1550℃*3h | ±0.5 | ±0.5 | ±0.5 | ±0.5 1400℃*3h | ±0.5 1400℃*3h | ≤0.6 1400℃*3h | ||
Thermal Conductivity At 1000℃ | W/m.k | ≤3.1 | ≤3.1 | ≤3.1 | ≤3.7 | ≤3.7 | ≤3.7 | |
Recommended Maximum Service Temperature | ℃ | 1600 | ||||||
Application Method | casting | |||||||
