Magnesia‑Chrome Brick High Chrome
Magnesia‑Chrome Brick High Chrome are composed of high-purity MAGNESIA (MgO) and a significant amount of CHROMIUM OXIDE (Cr2O3), typically derived from high-grade natural chrome ore or synthetic MgO-Cr2O3 co-clinkers. The Cr2O3 content is generally over 15%.
| CATEGORY | Cr2O3 CONTENT | MgO CONTENT | PRIMARY ADVANTAGE |
| HIGH Cr2O3 | 15% – 30% | 50% – 75% | Enhanced resistance to complex slag and spalling |
| STANDARD Cr2O3 | 8% – 12% | 60% – 80% | General purpose basic refractory |
Key Properties and Performance
| PROPERTY | TYPICAL PERFORMANCE | MECHANISM OF ADVANTAGE |
| Slag Resistance | EXCELLENT | $\text{Cr}_{2}\text{O}_{3}$ is insoluble in both $\text{MgO}$ and the slag, preventing infiltration and chemical dissolution. |
| Thermal Shock | GOOD (Improved) | The secondary phases ($\text{Cr}_{2}\text{O}_{3}$ and $\text{Spinel}$) reduce the thermal expansion and increase the elasticity of the $\text{MgO}$ matrix. |
| Creep in Compression ($\text{CISC}$) | VERY LOW | The chrome phases stabilize the grain boundaries, maximizing resistance to deformation under load at high temperatures. |
| Hot Strength ($\text{T}_{UL}$) | VERY HIGH | Maintained by the $\text{MgO}$ and the highly refractory $\text{Cr}_{2}\text{O}_{3}$ component. |
Magnesia‑Chrome Brick High Chrome: Advantages and Key Characteristics
High Cr2O3 Magnesia-Chrome bricks are used in high-wear, basic slag environments where superior slag and spalling resistance are needed, exceeding the capability of standard MgO or MgO-C grades.
- Enhanced Chemical Inertness: The higher Cr2O3 content provides superior resistance against basic CaO-rich slags, as well as complex, low-silica slags often found in refining processes.
- Superior Spalling Resistance: Cr2O3 inclusion helps suppress the formation of low-melting silicate phases common in pure MgO, and the resulting composite structure has better thermal shock resistance, allowing for slightly faster cycling than DBM.
- Volume Stability: The formation of MgO-Cr2O3 solid solutions and spinels creates a dense, interlocked structure that is highly resistant to volume changes and creep under load.
Typical Industries and Applications
This premium grade is used in severe thermal and chemical conditions:
- Non-Ferrous Industry: Converters, smelting furnaces, and refining vessels for copper, nickel, and lead, which often generate aggressive Fe-rich basic slags.
- Cement Industry: Transition and burning zones of rotary kilns that operate at very high temperatures and require improved thermal shock resistance.
- Glass Industry: Specialized regenerator zones in the presence of strong Na2O and V2O vapors.
Furnace Areas and Service Zones
They are specified for high-risk zones where standard refractories fail quickly:
- COPPER/NICKEL CONVERTER SLAG LINE: The most demanding application, requiring resistance to highly corrosive Fe– and Cu-rich basic slags and thermal cycling.
- CEMENT KILN TRANSITION ZONE: Area between the burning zone and the preheater, where high temperature meets high thermal gradient.
- EAF/BOF BOTTOM AND HOT SPOT LININGS: Used for extended campaign life in specific severe zones.
Key Data Sheet Properties to Consider
Selection criteria focus on the active Cr2O3 component:
- Cr2O3 Content: 15% or higher must be verified for this designation.
- R2O3 Ratio (Al2O3 + Cr2O3): High total refractory oxide content is required for maximum performance.
- Bulk Density (BD) and Apparent Porosity (AP): Must be maximized (BD) and minimized (AP) to resist slag infiltration.
- Bonding Type: Fusion-cast or high-sintered MgO-Cr2O3 co-clinkers offer superior performance to simple mixes.
Technical Guidance: High Cr2O3 Magnesia-Chrome bricks are high-cost refractories. Their use is justified by the need for superior spalling resistance and chemical stability in complex slag systems. As with all chrome-containing refractories, specific waste handling protocols must be observed to manage potential Cr(VI)}$ formation upon demolition and disposal.
✨ Customization Services
We offer product customization services, allowing you to tailor the appearance, dimensions, or specific markings of items like refractory shapes or bricks. This includes options for incorporating specific geometric requirements to ensure seamless integration into your process systems.
🔬 Sampling for Testing & Validation
Free product samples are available for thorough testing and validation. This allows you to confirm the quality, compatibility, and performance of our materials—such as specific bricks, castables, or raw materials—before committing to a full order.
💡 Expertise in Refractory Solutions
Leverage our deep expertise to receive detailed, application-specific refractory solutions. We move beyond just selling products by providing comprehensive plans that encompass material selection, installation guidance, and performance optimization to maximize the lifespan and efficiency of your high-temperature processes.
Rabatec products are exclusively manufactured in facilities that have achieved rigorous ISO certifications across Quality (ISO 9001), Environmental Management, and Occupational Health & Safety. This commitment ensures every product, from refractory bricks to specialized equipment, meets the highest global benchmarks for performance, sustainability, and workplace safety.
📦 Logistics Excellence: Shipping, Packaging, and Marking
Minimizing Risk: We manage all logistics to minimize handling touchpoints and transit shock. Our carriers are pre-vetted for their experience in transporting heavy, fragile, and sensitive industrial materials.
Traceability: Every shipment includes comprehensive documentation and tracking information, providing end-to-end visibility and ensuring precise delivery coordination for your site.
Protection is Paramount: Our packaging strictly follows industry standards to prevent damage, corner chipping, and moisture absorption—especially critical for materials like Basic Refractory Bricks and Refractory Mortars & Mixes.
Robust Palletization: Products are secured on fumigated, high-strength export pallets (e.g., 1100x950mm or similar sturdy dimensions) using heavy-duty strapping and durable protective wrapping (polyethylene sheeting, cardboard, etc.) to withstand long-distance travel and multiple loadings.
Moisture Control: Sensitive materials are protected with appropriate sealing and, where necessary, desiccants or moisture-vapor proof enclosures to maintain the product's integrity until installation.
Clear Identification: All outer packaging is clearly marked on multiple sides with large, legible text for immediate identification and safe handling.
Full Traceability: Markings include all essential data points: Product Name, Quality Grade, Batch Number, Quantity, Net/Gross Weight, Order Number, and the Final Destination/Construction Area. This ensures every pallet can be accounted for and correctly staged upon arrival.
Safety & Compliance: We adhere to all regulatory requirements for marking, labeling, and placarding—especially for any items classified as Dangerous Goods—to ensure full compliance with international and domestic transport regulations.
❓ Frequently Asked Questions (FAQ)
Question | Elaborated Answer |
Q: What is the Refractoriness Under Load (RUL) of your refractories? | A: Refractoriness Under Load (RUL) is a critical property that defines the maximum temperature our materials can withstand while under compressive stress before deforming (softening). Since we offer a wide range of materials—from Alumina-Silicate Bricks to high-performance Silicon Carbide Bricks—the RUL varies significantly. For specific product data, please refer to the product data sheet or submit a quote request for the material you are interested in. |
Q: Where are the Rabatec refractories and materials produced? | A: Our products are primarily sourced from specialized manufacturing plants in China. Crucially, these facilities have all undergone rigorous audits and achieved comprehensive ISO certifications (Quality, Environment, and Safety), ensuring that production adheres to the highest global standards for consistency and performance. |
Q: What refractory materials does the company offer? | A: We supply a comprehensive portfolio of advanced refractory solutions, including: Shaped Products: Alumina & Silica Bricks, Basic & Specialized Bricks (e.g., Magnesia), SiC & Structural Ceramics, and Precast Shapes. Monolithic Products: Refractory Castables, Mixes & Mortars. Insulation: Insulation Fibre and High-Performance Insulation Products. |
Q: How should I choose the appropriate refractory material for my application? | A: Selecting the correct refractory is paramount to process efficiency. The choice depends on three key factors: 1. Operating Environment: Maximum process temperature and thermal cycling (shock). 2. Chemical Attack: Type of slag, molten metal, or corrosive gas being handled (acidic, neutral, or basic). 3. Mechanical Stress: Abrasion, erosion, and static load requirements. We recommend utilizing our detailed refractory solutions service to consult with our engineers for an optimized, application-specific recommendation. |
Q: Which monolithic material should I choose when patching an existing lining? | A: For patching and minor repairs, the ideal monolithic material depends on the parent lining material, the patching depth, and the need for a rapid return to service. Common choices include: Refractory Mortars & Mixes (for minor joints/surfaces) or Plastic Refractories (for areas requiring physical compaction). Always choose a patch material chemically compatible with the existing lining to ensure proper bonding and service life. |
Q: Can I receive product samples before placing a major order? | A: Yes. We gladly provide product samples for your internal testing and validation purposes. This ensures you can confirm the quality, composition, and fit of the material—such as our Refractory Castables or Alumina-Silicate Bricks—in your specific operational environment before committing to a bulk purchase. |
Q: Do you provide certifications to verify material quality? | A: Absolutely. We provide product-related inspection certificates and quality assurance documentation upon request. This verifies that your order has passed all internal quality control checks and meets the required material specifications and industry standards. |
Q: What measures are taken for product protection during transport? | A: We ensure quick, reliable transport by using robust, industrial packaging that strictly follows industry standards. This includes high-strength palletization, heavy-duty strapping, and weather-resistant wrapping to protect fragile items like bricks and mixes from corner chipping, mechanical damage, and moisture during transit. |
