Chromium corundum is a material composed of aluminum oxide and chromium oxide, with high hardness, high melting point, excellent wear resistance, oxidation resistance and corrosion resistance.
(1) High refractoriness
(2) High refractoriness under load
(3) Strong slag resistance
(4) High compressive strength
(5) Good stability
(6) Good wear resistance
(1) Iron and steel manufacturing industry: blast furnace, hot blast furnace, electric furnace, ladle, tundish, heating furnace, refining furnace, heating furnace, annealing furnace, cupola
(2) Nonferrous metal industry: smelting furnace, refining furnace, reverberatory furnace, converter furnace.
(3) Building materials industry: cement kiln, glass kiln, ceramic kiln, lime kiln, kiln car, tunnel kiln
(4) Energy and incineration: coke oven, circulating fluidized bed boiler, carbon roaster, incinerator.
| Item | Parameter Range |
| Chemical Composition |
Al₂O₃: ≥85% Cr₂O₃: 5% - 30% (Low-chrome: 5%-10%; Medium-chrome: 10%-20%; High-chrome: ≥20%) SiO₂: ≤2% Fe₂O₃: ≤1.5% CaO + MgO: ≤1% |
| Physical Properties |
Bulk Density: ≥3.6g/cm³ Apparent Porosity: ≤12% Compressive Strength: ≥150MPa Bending Strength (Room Temperature): ≥18MPa Thermal Conductivity (1000℃): 3.0 - 4.0W/(m·K) Linear Expansion Coefficient (20℃ - 1000℃): 7.0 - 8.5×10⁻⁶/℃ Thermal Shock Resistance (1100℃ Water Quenching): ≥15 times |
| Temperature Resistance |
Long-term Operating Temperature: 1600℃ - 1750℃ Maximum Using Temperature: ≤1800℃ |
| Corrosion Resistance |
Corrosion Rate to Alkaline Slag (1500℃, 2h): ≤0.5g/cm² Corrosion Rate to Molten Steel (1600℃, 1h): ≤0.3g/cm² |
| Appearance & Size |
Regular Sizes: 230×114×65mm, 230×114×75mm, 250×125×65mm, 300×150×75mm Special Sizes: Customizable (Tolerance: ±1mm for length/width, ±0.5mm for thickness) |
Chrome Corundum Bricks are specialized refractory materials designed to withstand severe slag corrosion, thermal shock, and high-temperature environments encountered in steel, cement, and non-ferrous metal industries. Unlike conventional high-alumina bricks, Chrome Corundum Bricks offer superior chemical stability and structural integrity, making them the ideal choice for critical areas such as ladle slag lines, furnace hearths, and kiln transition zones.
These bricks combine high Cr2O3 content with Al2O3 to create a solid solution that resists penetration and erosion by aggressive slags. They are engineered for longevity, reliability, and efficiency, reducing maintenance downtime and overall operational costs. Highland Refractory specializes in manufacturing high-quality Chrome Corundum Bricks with precise dimensional tolerance and consistent chemical composition, ensuring predictable performance in the most demanding industrial applications.
Industrial furnaces and kilns face a range of challenges that compromise the lifespan and efficiency of refractory linings. Key issues include:
Severe Slag Corrosion: FeO, CaO, and alkali-rich slags aggressively attack conventional bricks, leading to rapid material loss and furnace downtime.
Thermal Shock and Mechanical Stress: Rapid temperature fluctuations cause cracking, spalling, and structural weakening, especially in transition zones and ladle linings.
Chemical Reactions: Interaction between refractory materials and molten slags can result in phase changes that reduce mechanical strength.
Short Service Life of Conventional Bricks: High alumina bricks or standard magnesia bricks often fail prematurely in high-chrome or highly erosive environments, leading to frequent replacements.
Recognizing these challenges is critical for selecting the right refractory solution. Chrome Corundum Bricks address these issues with advanced chemical composition, microstructural stability, and precise manufacturing techniques.
Chrome Corundum Bricks are a class of high-performance refractory bricks primarily composed of Al2O3 and Cr2O3. The unique combination of these oxides forms a solid solution with excellent resistance to slag penetration and chemical corrosion. Key characteristics include:
High Cr2O3 Content: Typically 18–25%, enhancing resistance to iron and lime slags.
Al2O3 Content: Above 70%, ensuring structural stability and high-temperature strength.
Low Porosity: Minimizes slag infiltration and enhances mechanical properties.
Thermal Stability: Retains integrity at temperatures exceeding 1650°C, suitable for severe industrial processes.
The microstructure features a dense matrix of spinel phases that contribute to its superior resistance against chemical attack and mechanical wear. This microstructural advantage is critical for long-term performance in steel ladle linings, cement kiln zones, and other high-temperature applications.
The performance superiority of Chrome Corundum Bricks stems from their chemical and structural properties:
Slag Resistance: Cr2O3 forms a stable spinel structure with Al2O3, which acts as a barrier against slag penetration.
Thermal Shock Resistance: The dense microstructure reduces crack propagation and minimizes spalling under rapid temperature changes.
Mechanical Strength: High alumina content ensures compressive strength and wear resistance, maintaining integrity under heavy mechanical loads.
Chemical Stability: Chrome Corundum Bricks resist attack from aggressive slags containing FeO, CaO, and alkali compounds.
Reduced Maintenance: Longer service life translates to fewer furnace shutdowns and lower replacement costs.
These characteristics make Chrome Corundum Bricks the preferred choice for high-stakes industrial operations where failure can result in significant financial losses and operational disruptions.
Understanding how Chrome Corundum Bricks compare to other options is essential for informed selection.
Chemical Resistance: Chrome Corundum offers superior resistance to FeO and CaO slags compared to standard high alumina bricks.
Thermal Stability: Higher spinel content improves thermal shock resistance.
Service Life: Typically 1.5–2 times longer under similar operating conditions.
Slag Resistance: Both resist basic slags well, but Chrome Corundum performs better in acidic or mixed slags.
Mechanical Strength: Chrome Corundum maintains structural integrity at higher temperatures.
Environmental Compliance: Chrome Corundum often has lower free lime content, making it safer for certain industries.
High-Temperature Performance: Mullite Corundum is excellent at very high temperatures (>1700°C), but Chrome Corundum balances high-temperature resistance with superior slag corrosion resistance.
Application Fit: Chrome Corundum is preferred for slag-laden environments, while Mullite Corundum is ideal for ultra-high temperature zones with low slag exposure.
By understanding these differences, engineers and procurement specialists can match the brick type to the specific furnace or kiln conditions, optimizing performance and cost efficiency.
Chrome Corundum Bricks are versatile and can be applied in various high-temperature industrial scenarios. Below is a selection guide based on common applications:
Problem: Heavy erosion from molten steel and slag, thermal cycling during ladle operations.
Solution: Chrome Corundum bricks offer high slag resistance and thermal shock stability, extending lining life.
Typical Service Life: 12–18 months depending on operating conditions.
Operating Temperature: 1600–1650°C
Problem: Extreme temperature gradients and corrosive clinker slag.
Solution: Dense microstructure and chemical stability minimize spalling and erosion.
Typical Service Life: 24–36 months.
Operating Temperature: 1450–1550°C
Problem: Aggressive acidic slags containing FeO, CaO, and alkali compounds.
Solution: Chrome Corundum bricks resist chemical attack while maintaining structural strength.
Typical Service Life: 18–30 months.
Operating Temperature: 1550–1650°C
Each scenario highlights the importance of selecting the right brick composition and quality to minimize downtime, improve efficiency, and reduce operational costs.
Highland Refractory's Chrome Corundum Bricks are manufactured to strict specifications. Typical parameters include:
Al2O3 Content: 70–75%
Cr2O3 Content: 18–25%
Bulk Density: 3.5–3.6 g/cm³
Cold Crushing Strength (CCS): ≥80 MPa
Refractoriness: ≥1770°C
Apparent Porosity: 10–12%
These parameters ensure reliable performance and are verified through rigorous quality control during production.
Highland Refractory employs advanced manufacturing processes to produce Chrome Corundum Bricks:
Raw Material Selection: High-purity bauxite and chrome ore are sourced and blended to precise ratios.
Shaping & Pressing: Bricks are formed under high pressure to achieve consistent density and shape.
Firing: Controlled high-temperature firing ensures complete formation of the Cr2O3-Al2O3 spinel phase.
Inspection: Dimensional tolerance, bulk density, porosity, and chemical composition are tested for every batch.
This rigorous process guarantees uniform quality, dimensional accuracy, and long-term performance under severe operating conditions.
Chrome Corundum Bricks are designed to comply with environmental and safety standards:
Low Free Lime Content: Minimizes potential chemical hazards.
Stable Under High Temperature: Reduces emissions during furnace operation.
Recyclable: Bricks can be crushed and reused in certain industrial processes.
These considerations ensure that using Chrome Corundum Bricks is safe for personnel and compliant with regulatory standards.
Q1: Is Chrome Corundum Brick environmentally safe? A1: Yes, Highland Refractory Chrome Corundum Bricks have low free lime content and are stable at high temperatures, minimizing environmental impact.
Q2: How does Chrome Corundum Brick compare to Magnesia Chrome Brick? A2: Chrome Corundum offers superior resistance to acidic and mixed slags, while Magnesia Chrome performs well in basic slag environments.
Q3: Can Chrome Corundum Bricks replace high alumina bricks? A3: Yes, especially in areas with aggressive slag corrosion, thermal shock, or high operational temperatures.
Q4: What is the typical service life of Chrome Corundum Bricks in steel ladles? A4: Depending on operating conditions, service life can range from 12 to 18 months, often longer than conventional high alumina bricks.
Q5: At what temperatures can Chrome Corundum Bricks operate? A5: They perform reliably between 1450°C and 1650°C, depending on the specific application.
Highland Refractory is a trusted manufacturer with over 30 years of experience in producing high-quality refractory materials. Our Chrome Corundum Bricks are:
Certified and Tested: ISO and international standards compliance.
Consistently Manufactured: Ensuring reliable dimensional and chemical consistency.
Industry-Focused: Tailored solutions for steel, cement, and non-ferrous industries.
Global Reach: Exported worldwide with proven field performance.
For engineers and procurement specialists looking to optimize furnace performance, Highland Refractory provides detailed consultation, technical support, and customized Chrome Corundum Brick solutions. Contact us today to discuss your specific operational challenges and discover how our products can extend service life, reduce maintenance costs, and improve overall efficiency.
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