Chrome Corundum Brick | Direct Factory Supply

Parameter of Chrome Corundum Brick

Item		GGZ-30	GGZ-20	GGZ-12	GGZ-5
Cr2O3, %	≥	30	20	12	5
Fe2O3, %	≤	0.3	0.3	0.3	0.3
Al2O3, %	≥	68	76	80	85
Apparent Porosity, %	≤	18	18	18	18
Bulk Density, g/cm3	≥	3.5	3.4	3.2	3.1
Cold Crushing Strength, MPa	≥	100	100	100	100

Types of Chrome Corundum Brick

REBO chrome corundum refractory bricks (chrome alumina fire bricks) are premium refractory materials produced by combining alumina (Al₂O₃) and chromic oxide (Cr₂O₃). They are globally categorized by chemical composition, manufacturing process to suit various high-temperature, high-corrosion industrial applications.

1. Classification by Chemical Composition

Low Chrome Corundum Brick
Cr₂O₃ Content: 5-15%
Al₂O₃: ≥80%
Features: Excellent thermal shock resistance, high abrasion resistance, high mechanical strength, and high cost-effectiveness.
Primary Applications: Ladle mouths, steel reheating furnace skids, garbage incinerator non-critical zones, and carbon black reactor combustion chambers.

Medium Chrome Corundum Brick
Cr₂O₃ Content: 15-30%
Al₂O₃: 65-80%
Features: Balanced performance offering improved molten slag resistance while maintaining reliable thermal stability.
Primary Applications: Carbon black reactor reaction zones, non-ferrous metallurgical furnaces (copper/nickel slag lines), and glass furnace working channels.

High Chrome Corundum Brick

Cr₂O₃ Content: 30-60% (Up to 75-95% for ultra-high chrome grade)
Features: Extreme resistance to chemical corrosion, acid/alkali slag erosion, and high-velocity molten fluid abrasion.
Primary Applications: Coal water slurry gasifiers (slag taps & domes), hazardous waste incinerators, and glass furnace throat blocks, petrochemicals furnace, and so on.

2. Classification by Manufacturing Process

High-Temperature Sintered Bricks
Process: This is default standard process. Formed under high temp 1750°C) to form a dense Al₂O₃-Cr₂O₃ solid solution.
Features: Excellent structural integrity and superior thermal shock resistance compared to cast refractories. The primary choice for most industrial kilns.

Chemical-Bonded Bricks
Process: Molded using specialized liquid refractory slurries or chemical binders (such as phosphate), followed by curing and low-to-medium temperature baking.
Features: Shorter production cycles and lower costs, ideal for complex onsite poured linings or temporary repair blocks.

Fused Cast Bricks
Process: Raw materials are fully melted in an electric arc furnace and poured directly into graphite or sand molds, followed by controlled annealing.
Features: Near-zero porosity, ultra-high bulk density, and maximum resistance to molten glass/slag erosion. (Commonly includes Zirconia to form AZCS for improved toughness).

Classification by Shape & Geometry

Due to the extreme hardness of chrome corundum (Mohs hardness 9+), all shapes are precision-engineered before delivery to minimize the need for on-site cutting. REBO offers standard bricks, commonly used special shapes, and fully custom designs to meet your specific kiln requirements.

Standard & Regular Shapes of Chrome Corundum Bricks

Straight Bricks: Standard dimensions like T-3 (230*114*65mm) and thickened blocks for flat walls and hearth paving.
Wedge & Arch Bricks: Vertical wedges, end wedges, and skewbacks used to build cylindrical furnace bodies (gasifiers) and curved roof arches.
Other Popular Size: Anchor refractory firebrick, octagonal tube/sleeve bricks, checker bricks, throat constriction rings, throat blocks & forehearth channels, gasifier slag tap blocks, burner blocks, tongue & groove bricks, etc.

Custom Fabricated Chrome Corundum Bricks

Precision Diamond-Machined Blocks: Large blocks used in glass furnace throats and slag taps. Six-side precision diamond ground to guarantee joint clearances <0.5mm. Functional Hole Blocks: Burner/nozzle blocks, electrode blocks, and bubbling blocks featuring custom center holes and bevels built to client CAD drawings.
Pre-Assembled Segmented Rings: Multi-piece interlocking ring systems tailored for coal gasifier slag ports.

Global Cases of Chrome Corundum Bricks

Over 50+ industrial projects across the globe rely on our Chrome Corundum Bricks for their most demanding furnace zones. From gasifier slag taps to glass furnace throats, our premium refractory bricks deliver unmatched resistance against slag erosion and thermal wear. Engineered with a precision (Al₂O₃-Al₂O₃) solid-solution matrix, this material has been proven to extend slag tap service life by 30%–50%.

Applications of REBO Chrome Corundum Bricks

Industry	Critical Application Zones	Primary Wear Factors	Recommended Grade (Cr2O3%)	Common Shapes
Glass Manufacturing	Throat blocks, forehearth channels, burner ports, electrode holes	Molten glass flow, batch dust corrosion	High/Medium/Low Chrome (5-60%) or AZCS	Precision diamond-ground blocks, U-channels, custom drilled blocks
Coal Chemical	Gasifier slag taps, domes, and cone sections	Coal slag erosion, high-velocity melt flow	High-Chrome (30-90%)	Interlocking ring segments, vertical wedge bricks
Waste Incineration	Incinerator slag lines, combustion chambers, burner ports, ash chutes	Acid/alkali fly ash corrosion, slag erosion, thermal shock	Medium-to-High Chrome (15-50%)	Thickened straight bricks, side wedge bricks, burner blocks
Oil Refining & Petrochemicals	FCCU regenerator linings, sulfur recovery units (SRU), Claus reactors	High-velocity catalyst particle abrasion, $H_2S$/acid gas corrosion	Low-to-Medium Chrome (5-20%)	Standard straight bricks (T-3), anchor bricks, radius blocks
Non-Ferrous Metallurgy	Copper/nickel/zinc smelting slag lines, tap holes	Metal slag penetration, liquid metal erosion	Medium Chrome (15-30%)	Standard straight bricks (T-3), skewback bricks
Carbon Black	Reaction furnace throats, combustion chambers	Extreme high-temperature gas flow, thermal shock	Medium-to-Low Chrome (10-20%)	Throat constriction rings, vertical wedge bricks
Environmental & Waste	Hazardous waste incinerator slag lines, rotary kiln inlets	Acid/alkali slag corrosion, mechanical wear	Medium-to-High Chrome (15%-50%)	Thickened straight bricks, end wedge bricks

Chrome Corundum Bricks Color Reveals The Performance

The color of chrome corundum bricks is not just aesthetic it is a direct indicator of their composition and high-temperature capability. During production, these bricks undergo a dramatic chromatic transformation: the unfired body presents a natural green hue, which completely changes after firing at elevated temperatures.

The decisive factor behind both the final color and the material’s resistance to chemical attack is the content of chromium oxide (Cr2O3). If you need further details, please don’t hesitate to contact REBO.

Grade / State	Color	Mineral Phase	Key Performance Advantage	Main Limitation	Typical Furnace Application
Unfired	Green State	Unreacted Al₂O₃ + Cr₂O₃ + Binders	Easy to mold, no thermal energy cost in manufacturing	Low mechanical strength; zero resistance to molten slag flow	Raw green brick prior to kiln firing
3% Cr₂O₃	Light Red	Low-Cr (Al, Cr)₂O₃ solid solution	Maximum thermal shock resistance; withstands rapid temp cycling	Moderate resistance to heavy chemical slag	Burner blocks, reheating furnace skids, ports
8% Cr₂O₃	Purple-Red	Medium-Cr solid solution	Optimal cost-to-performance ratio; balanced corrosion resistance	Not suitable for extreme, high-velocity slag taps	Carbon black reactors, non-ferrous slag lines
≥ 20% Cr₂O₃	Dark Blackish-Red	High-Cr dense solid solution	Maximum slag erosion resistance and extreme hardness (Mohs 9+)	Higher susceptibility to thermal spalling; higher material cost	Coal gasifier slag ports, glass furnace throats, incinerators

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REBO Has Direct Manufacturer Strength

High-Purity Raw Materials & Smart Batching

High-Purity Raw Materials & Smart Batching: REBO uses pure tabular alumina, fused alumina, and high-purity chromium oxide green (Cr₂O≥99%). This eliminates impurities like Fe₂O₃ and SiO₂ from the start. The result is excellent high-temperature corrosion resistance.
PLC-Controlled Automatic Batching: Our fully enclosed PLC system precisely controls each batch. It ensures even Cr₂O₃ distribution. This eliminates color differences and performance variations in the final product.

High-Tonnage Forming Equipment (For High Bulk Density)

Ultra-High Pressure Forming: REBO uses 600-ton to 1300-ton automatic hydraulic and friction presses. This greatly reduces apparent porosity (to 12–16% or lower). Bulk density reaches 3.1–3.5 g/cm³.
Complex Shape Pressing: REBO can produce octagonal barrel bricks, special wedge bricks, and large tank wall bricks. Our advanced molds and one-time high-pressure forming prevent internal delamination and cracks.

1750°C High Temperature Sintering & Atmosphere Control

Super-High Temperature Kilns: Our automated gas-fired shuttle kilns reach 1750°C. This ensures complete solid-solution reaction between alumina and chromium oxide. The result is a strong (Al,Cr)₂O₃ crystal lattice.
Precise Atmosphere Control: REBO strictly controls the firing curve and kiln atmosphere. This keeps chromium in its stable Cr³⁺ state for consistent color and crystal growth. The brick structure becomes dense with strong thermal shock resistance.

100% Diamond Grinding & Factory Pre-Assembly

CNC Precision Grinding: Large CNC diamond grinding machines surface-finish critical parts like flow hole and slag port bricks. Flatness tolerance is ≤0.5 mm.
100% Pre-Assembly Before Shipping: We perform 1:1 full assembly in our workshop based on your CAD drawings. We number every piece and provide assembly photos and videos. This guarantees zero on-site cutting and minimal joints.

Serving Global Customers

In-House Lab Testing & Full Traceability

Full COA Reports for Every Batch: Our lab is equipped with spectrometers, high-temperature reheat change testers, cold/hot compressive strength testers, and porosity testers.
Unique Numbering & Traceability: Every special-shaped brick gets a unique ID. Customers can trace it back to the raw material batch, kiln number, inspector, and assembly code.

Strong Technical Customization

CAD Design Support: REBO’s engineering team works directly with your kiln CAD drawings. We optimize high-wear areas like arch feet, centering rings, and through-hole bricks.
Custom Formulations: We adjust Cr₂O₃ content from 3% to 60% based on your actual operating temperature, slag chemistry, and flow conditions. This gives you the best cost-performance balance.

International Standard Shipping Packaging

Export-Grade Moisture-Proof Packaging: Each brick is wrapped in anti-moisture plastic film or vacuum-sealed. We add thick wooden edges and high-strength steel strapping. This guarantees zero chipping or breakage during long ocean voyages and multiple handling steps.
Container Loading Solutions: We customize pallet sizes for standard containers. We provide real-time loading photos and videos for your peace of mind.

Global Project Experience & Fast Response

Proven Track Record: REBO has successfully supplied large-scale projects worldwide, including coal gasifiers, glass furnaces, hazardous waste incinerators, and carbon black reactors.
24/7 Technical Support: We respond quickly from initial inquiry and TDS confirmation through production updates to on-site installation guidance.

Chrome Corundum Bricks VS Other Refractory Bricks

Refractory Brick	Main Composition & Type	Key Features	Primary Applications
Corundum Brick	Main: Al₂O₃ ≥ 90%	Extremely high refractoriness (>1790°C) and high-temperature strength; Excellent volumetric stability and heavy load-bearing capacity; Drawback: Moderate thermal shock resistance; prone to slag penetration.	Steel reheating furnace skids and hearths; Petrochemical cracking furnaces and ammonia reactors; High-temperature tunnel kilns and load-bearing structures.


Chrome Corundum Brick	Main: Al₂O₃ + Cr₂O₃ (Cr₂O₃: 5–60%)	Exceptional resistance to acid/alkali slag erosion; Extreme hardness and high-velocity melt/gas abrasion resistance (Mohs 9+); High crushing strength; effectively prevents liquid penetration.	Coal Chemical: Gasifier slag taps, domes, and cone sections; Glass Industry: Throat blocks, forehearth channels, and burner blocks; Carbon Black & Waste: Reactor throats and incinerator slag lines.


Corundum Mullite Brick	Main: Al₂O₃ (70-85%) + SiO₂	Superior thermal shock resistance (highly resistant to rapid heating/cooling); Ultra-low creep rate under high loads and elevated temperatures; Drawback: Lower resistance to strong alkaline slag than Chrome Corundum.	Kiln cars, pillars, and push plates for ceramic firing kilns; Hot blast stove regenerators and domes; Incinerator drying zones and areas with frequent temperature swings.


Magnesite Chrome Brick	Main: MgO + Cr₂O₃ (MgO ≥ 55-80%)	High immunity to strongly alkaline slag corrosion; High refractoriness and non-wetting to molten slag; Drawback: Lower mechanical strength/abrasion resistance; hexavalent chromium (Cr⁶⁺) environmental risk.	Cement Industry: Burning zones of rotary kilns; Steel Metallurgy: Converter furnaces and RH refining ladles; Non-Ferrous: Copper and nickel smelting slag lines.

FAQs of Chrome Corundum Brick

Q: What is the Difference Between Chrome Corundum Bricks and Standard Corundum Bricks?

A: Standard corundum bricks offer high refractoriness but have moderate slag resistance. Chrome corundum bricks introduce chromium oxide (Cr₂O₃), which forms a solid solution lattice. This dramatically increases density, reduces porosity, and provides extreme resistance to severe acid/alkali molten slag and high-velocity melt erosion. See some photos on Facebook.

Q: Which Cr₂O₃ Percentage Grade Should Customers Choose for Their Furnaces?

A: Selection depends on your primary wear factor:
Thermal Fluctuations (Burner blocks, heating zone): Choose low-chrome (3−8%).
Moderate Slag Erosion (Carbon black, non-ferrous slag line): Choose medium-chrome (10−20%).
Severe Melt Flow & Slag (Gasifier slag taps, glass furnace throats): Choose high-chrome (≥30%).

Q: How Do You Prevent Joint Gaps and Slag Leakage During Site Installation?

A: REBO performs 6-face CNC diamond grinding on high-precision blocks to achieve tight tolerances (≤0.5 mm). Furthermore, we conduct 100% dry-lay pre-assembly in our workshop according to your CAD drawings. Every brick is numbered before packing to ensure zero-gap assembly on-site.

Q: Are These Bricks Suitable for Thermal Shock Conditions With Frequent Temperature Changes?

A: High-chrome bricks (>20% Cr₂O₃) are brittle under extreme thermal swings. For zone applications requiring rapid cooling and heating cycles, REBO recommends our low-chrome grade (3−8% Cr₂O₃) or AZCS (zirconia-chrome corundum) formulations to optimize elasticity and prevent spalling.

Q: How Do You Pack Heavy Chrome Corundum Bricks to Prevent Edge Chipping During Sea Freight?

A: Each brick is individually wrapped in protective moisture-proof film. Blocks are loaded onto export-grade fumigation-free wooden pallets, secured with heavy-duty steel strapping, and reinforced with corner protection guards. REBO guarantees intact delivery from factory floor to your job site.

Q: What Technical Data or Documents Does REBO Provide Before Order Placement?

A: We provide full transparency before you buy:
Complete Technical Data Sheet (TDS) matching your required grade.
Third-party Certificate of Analysis (COA) (chemical composition & crushing strength).
3D/CAD drawing verification and pre-assembly photos/videos.