Monolithic RefractoriesCastables
Low & Ultra-Low Cement Castable
Dense low- and ultra-low-cement castables in clay, high alumina and corundum materials, with small pore size, high density, good volume stability, high strength and low water addition.
- Grades / types
- Clay, High Alumina, Corundum
Product overview
Low- and ultra-low-cement castables have small pore size, high density, good volume stability, high strength and a low water addition. Unlike conventional castables, whose strength drops significantly between 800 and 1200 ℃, their strength increases as the temperature rises.
They have excellent thermal shock resistance, slag resistance and corrosion resistance. Three material types are specified: clay, high alumina and corundum.
Key characteristics
- Small pore size and high density
- Good volume stability
- High strength that increases with temperature
- Low water addition
- Excellent thermal shock, slag and corrosion resistance
- Clay, high alumina and corundum types
Technical data
| Property | Unit | Clay | High Alumina | Corundum |
|---|---|---|---|---|
| Al₂O₃ | % | ≥45 | ≥75 | ≥98 |
| CaO | % | <1.8 | <1.5 | <1.0 |
| Bulk Density (110℃×24h) | g/cm³ | ≥2.3 | ≥2.6 | ≥3.1 |
| Bulk Density (1350℃×3h) | g/cm³ | ≥2.26 | ≥2.61 | — |
| Bulk Density (1550℃×3h) | g/cm³ | — | — | ≥3.00 |
| Cold Crushing Strength (CCS) (110℃×24h) | MPa | ≥70 | ≥75 | ≥85 |
| Cold Crushing Strength (CCS) (1350℃×3h) | MPa | ≥85 | ≥90 | — |
| Cold Crushing Strength (CCS) (1550℃×3h) | MPa | — | — | ≥100 |
| Cold Modulus of Rupture (CMOR) (110℃×24h) | MPa | ≥6 | ≥8 | ≥9 |
| Cold Modulus of Rupture (CMOR) (1350℃×3h) | MPa | ≥8 | ≥9 | — |
| Cold Modulus of Rupture (CMOR) (1550℃×3h) | MPa | — | — | ≥11 |
| Permanent Linear Change (PLC) (1000℃×3h) | % | -0.3 | -0.2 | -0.2 |
| Permanent Linear Change (PLC) (1350℃×3h) | % | ±0.3 | ±0.5 | — |
| Permanent Linear Change (PLC) (1550℃×3h) | % | — | — | ±0.5 |
| Max Working Temperature | ℃ | 1450 | 1600 | 1800 |
Where Refractories Are Used
Industry
Steel & Iron
Refractories in iron and steel production are used in the blast furnace, hot blast stove, cast house and coke oven on the ironmaking side, and in the hot metal ladle, converter, electric arc furnace, steel ladle, tundish, RH degasser and reheating furnace on the steelmaking side. Material selection varies by operating zone and includes silica, high alumina, magnesia, magnesia-carbon, alumina-silicon carbide-carbon and silicon carbide products together with castables, ramming mixes and mortars.
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Nonferrous Metals
Refractories for nonferrous metals divide into two groups. For aluminium they line the electrolysis cell side wall, corners and bottom, the smelter and the holding furnace, using silicon nitride bonded silicon carbide, carbon-based materials, low cement and non-stick castables and insulation. For copper, zinc, lead and nickel they are magnesia-chrome bricks in directly bonded, semi-rebonded and fused rebonded types.
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Cement
Refractories in cement plants line the preheater, the calciner and tertiary air duct, the rotary kiln from the kiln inlet through the safety, transition and burning zones to the kiln outlet, the kiln hood and burner, and the grate cooler. RISING's kiln configuration tables assign alkali-resistant bricks and castables to the preheater system, silicon mullite, magnesia spinel and magnesia-chrome bricks to the kiln zones, and low-cement and steel-fiber castables to the kiln mouths, hood and cooler.
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Available grades, shapes and sizes
Available grades
- Clay
- High Alumina
- Corundum
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Technical Consultation
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