High-alumina castable is a refractory material formulated with high-alumina bauxite clinker as the main raw material, combined with appropriate binders and additives. Its key characteristics include high refractoriness, excellent high-temperature mechanical strength, good thermal shock resistance, and strong resistance to chemical corrosion. It can be directly mixed with water for casting and molding, offering strong adaptability and controllable porosity.
· Good workability
· Good resistance to chemical attack
· High bonding strength
· Low drying and firing shrinkage
· Good slag resistance and thin masonry joints
This material is widely used in high-temperature industrial fields such as metallurgy, building materials, and electric power.
In the metallurgical industry, it is used as lining and insulation for blast furnaces, converters, and ladles.
In the building materials industry, it is suitable for critical areas such as the burning zone of cement rotary kilns and regenerators of glass furnaces.
In the electric power sector, it is applied to boiler combustion chamber linings and checker brick linings of hot blast stoves.
In addition, it is ideal for lining construction of various heat treatment furnaces and heating furnaces, meeting high-temperature service requirements under different operating conditions.
Index Products | Unit | High-alumina Castable Series | ||||||
CT A-50 | CT A-55 | CT A-60 | CT A-65 | CT A-70 | CT A-75 | |||
Al2O₃ | % | ≥50 | ≥55 | ≥60 | ≥65 | ≥70 | ≥75 | |
Fe2O3 | % | ≤3.0 | ≤3.0 | ≤2.8 | ≤2.0 | ≤2.0 | ≤2.0 | |
Bulk density ≥ | g/cm³ | ≥2.2 | ≥2.25 | ≥2.3 | ≥2.4 | ≥2.5 | ≥2.6 | |
Modulus of rupture ≥ | 110℃*24h | MPa | ≥5 | ≥5 | ≥5 | ≥6 | ≥7 | ≥7 |
1100℃*3h | ≥4 | ≥6 | ≥6 | ≥7 | ≥7 | ≥7 | ||
1350℃*3h | _ | _ | _ | ≥7 | ≥8 | ≥8 | ||
Cold crushing strength ≥ | 110℃*24h | MPa | ≥35 | ≥35 | ≥40 | ≥40 | ≥40 | ≥40 |
1100℃*3h | ≥30 | ≥40 | ≥40 | ≥60 | ≥60 | ≥60 | ||
1350℃*3h | — | — | — | ≥60 | ≥60 | ≥60 | ||
Reheating linear change | 1100℃*3h | % | ±0.5 | ±0.5 | ±0.5 | ±0.5 | ±0.5 | ±0.5 |
1350℃*3h | — | — | — | ±0.5 | ±0.5 | ±0.5 | ||
Thermal Conductivity At 600℃ | W/m.k | ≤1.8 | ≤1.8 | ≤1.8 | ≤1.8 | ≤2.2 | ≤2.2 | |
Recommended Maximum Service Temperature | ℃ | 1300 | 1350 | 1350 | 1350 | 1350 | 1400 | |
Application Method | casting | |||||||