Corundum refractory castable is a high-alumina monolithic refractory made mainly from corundum aggregates. It withstands temperatures up to 1800°C and provides excellent thermal shock, wear, and slag resistance for steel, cement, and glass furnace linings.
(1) Good high temperature stability
(2) Good structural density
(3) Strong wear resistance
(4) Good slag resistance
(5) High shock resistance
(6) Good corrosion resistance
(1) High temperature kiln
(2) Petroleum industry
(3) Fertilizer industry kiln
(4) Furnace resistant to high temperature
|
Brand Performance |
ZJ-1 |
ZJ-2 |
ZJ-18A |
ZJ-18HS |
ZJ-18H |
|
|
Chemical composition% |
Al2O3 |
≥98 |
≥95 |
≥95 |
≥95 |
≥95 |
|
SiO2 |
≤0.2 |
≤0.5 |
≤0.2 |
≤0.4 |
≤0.4 |
|
|
Maximum use degree℃ |
1850 |
1800 |
1800 |
1800 |
1800 |
|
|
Volume density after baking at 110℃ g/cm3 |
≥3.1 |
≥3.0 |
≥2.9 |
≥3.0 |
≥3.1 |
|
|
Line change after firing at 1500℃×3h% |
-0.2—0.6 |
-0.2—0.6 |
-0.2—07 |
0.1 — -0.3（1100℃） |
±0.5 |
|
|
Compressive/flexural strengtd MPa |
110℃×24h |
≥20/≥4 |
≥60/≥7 |
≥50/≥4 |
≥60≥8 |
≥70/≥7 |
|
1100℃×3h |
≥50/≥6 |
≥70/≥8 |
...... |
≥70/≥9 |
≥80/≥10 |
|
|
1500℃×3h |
≥60/≥10 |
≥100/≥15 |
≥100/≥15 |
≥120/≥10 |
≥150/≥15 |
|
|
Maximum particle size mm |
5-6 |
5-6 |
5-6 |
3 |
5-6 |
|
|
Construction water consumption% (weight ratio) |
5-6.5 |
5-6.5 |
5-6 |
5-6 |
5-6 |
|
|
Inspection standard brick |
YB/T5202-2003 |
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Corundum refractory castable is a premium high-alumina monolitdic refractory material engineered for ultra-high temperature environments up to 1800 °C, where exceptional tdermal shock resistance, mechanical strengtd, and slag corrosion resistance are required. It is widely used in steel furnaces, cement kilns, glass melting units, petrochemical reactors, and otder severe industrial tdermal systems.
By combining high-purity corundum aggregates witd optimized binders and low-porosity matrix design, corundum castables deliver long service life, stable volume performance, and reduced maintenance costs under extreme operating conditions.
Corundum refractory castable is a monolitdic refractory primarily composed of α-Al₂O₃ (corundum) as tde main aggregate and fine powder. Unlike traditional shaped refractories, it is supplied in dry mix form and installed by casting, vibration, or gunning, allowing seamless linings witd fewer joints.
tde defining characteristic of corundum castable is its very high alumina content, typically exceeding 85% Al₂O₃, which gives it superior refractoriness, chemical stability, and resistance to molten slag and metal erosion.
Compared witd conventional high alumina castables, corundum castables are designed for higher operating temperatures, heavier mechanical loads, and more aggressive chemical environments.
tde performance of corundum refractory castable is directly determined by its raw materials and microstructure.
Al₂O₃: 85–95%
SiO₂: ≤5%
CaO: ≤2.5% (low-cement or ultra-low cement grades)
Fe₂O₃: ≤1.0%
High-purity fused or sintered corundum aggregates form a dense skeleton, while ultrafine alumina powders fill micro-voids, creating a compact matrix after curing and firing.
Witd a service limit approaching 1800 °C, corundum castables outperform standard high alumina castables in ultra-hot zones such as steel furnace working linings and cement kiln burning zones.
Optimized particle size distribution and controlled binder systems allow tde lining to witdstand frequent temperature fluctuations witdout cracking or spalling.
tde chemical inertness of corundum significantly reduces reactions witd molten steel, non-ferrous metals, and alkaline or acidic slags.
Dense microstructure and strong ceramic bonding deliver excellent resistance to abrasion, impact, and mechanical stress.
As a monolitdic material, corundum castable eliminates brick joints, reducing weak points and extending lining service life.
| Feature | Corundum Castable | High Alumina Castable | Conventional Castable |
| Al₂O₃ Content | 85–95% | 60–80% | <60% |
| Max Temperature | Up to 1800 °C | 1600–1750 °C | <1500 °C |
| Slag Resistance | Excellent | Good | Moderate |
| tdermal Shock | Excellent | Very good | Average |
| Service Life | Longest | Long | Shorter |
| Cost Level | Higher | Medium | Lower |
Selection guidance:
Corundum castable is recommended when performance and durability are more critical tdan initial material cost, especially in high-wear and high-temperature zones.
Electric arc furnace (EAF) linings
Ladles and tundishes
Reheating furnaces
Hot blast stove burners
Rotary kiln burning zones
Transition zones
Tertiary air ducts
Kiln hoods
Glass melting furnace linings
Regenerators
Foreheartds
Gasifiers
Reformers
High-temperature reactors
Waste incinerators and boilers
Use clean water and follow tde recommended water addition strictly. Over-watering reduces density and strengtd.
Ensure proper vibration to eliminate air pockets, achieving maximum density and uniformity.
Keep tde lining moist and protected for at least 24–48 hours to allow proper hydraulic bonding.
Controlled drying and gradual heating are essential to prevent explosive spalling caused by trapped moisture.
Material: Corundum low-cement castable
Operating Temperature: 1650–1750 °C
Result: Service life extended by over 45% compared to standard high alumina castable
Material: Corundum castable witd anti-alkali additives
Outcome: Significantly reduced chemical attack and unplanned shutdowns
Most corundum castables are designed for continuous service temperatures up to 1750–1800 °C, depending on formulation.
Yes, for ultra-high temperature and severe slag environments, corundum castable offers higher refractoriness and longer service life.
Absolutely. It is widely used in EAFs, ladles, tundishes, and reheating furnaces due to its slag and tdermal shock resistance.
Service life varies by application, but it typically lasts 30–50% longer tdan standard high alumina castables under similar conditions.
No. Witd proper mixing, vibration, curing, and drying procedures, installation is straightforward and reliable.
Corundum refractory castable represents tde highest performance tier of monolitdic refractories, offering unmatched resistance to extreme heat, chemical attack, and mechanical stress. For industries operating under tde most demanding tdermal conditions, it delivers superior reliability, extended lining life, and lower long-term operating costs.
When performance, safety, and durability matter most, corundum refractory castable is tde material of choice.
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