Technical Specifications of Magnesia Carbon Refractory Bricks
The number immediately following the ‘MT’ designation indicates the nominal carbon content (e.g., MT-10 contains approximately 10% carbon). The accompanying letter signifies the specific grade of magnesia raw materials utilized reflecting the purity of fused or sintered magnesia as well as the degree of impurity control (such as silica, iron oxide, and lime ratios). Please find the standard specifications below.
| Item | MgO, % | C, % | Apparent Porosity, % | Bulk Density, g/cm³ | Cold Crushing Strength, MPa |
|---|---|---|---|---|---|
| ≥ | ≥ | ≤ | ≥ | ≥ | |
| MT-8A | 82 | 8 | 4.5 | 3.05 | 45 |
| MT-8B | 81 | 8 | 5.0 | 3.00 | 45 |
| MT-10A | 80 | 10 | 4.0 | 3.02 | 40 |
| MT-10B | 79 | 10 | 4.5 | 2.97 | 40 |
| MT-12A | 78 | 12 | 4.0 | 2.97 | 40 |
| MT-12B | 77 | 12 | 4.0 | 2.94 | 35 |
| MT-14A | 76 | 14 | 3.5 | 2.95 | 38 |
| MT-14B | 74 | 14 | 3.5 | 2.90 | 35 |
| MT-16A | 74 | 16 | 3.5 | 2.92 | 35 |
| MT-16B | 72 | 16 | 3.5 | 2.87 | 35 |
| MT-18A | 72 | 18 | 3.0 | 2.89 | 35 |
| MT-18B | 70 | 18 | 3.5 | 2.84 | 30 |
Standard Dimensions & Shapes of Magnesia Carbon Bricks
Standard Straight Refractory Brick Dimension:
230x114x65mm
Popular Wedge Sizes (Length x WidthxT1/T2 Thickness):
230x114x75/65mm, 230x150x75/65mm, 300x150x75/65mm, 300x150x75/70mm, 350x150x75/65mm, 400x150x75/65mm.
Versatile Shape Options:
Wedge brick, arch brick, trapezoidal brick, sector brick, tapping hole sleeves, large slag line pre-assembled blocks, and custom shape bricks.
Customization Available:
REBO provides tailor-made bricks configurations based on your technical drawings, perfectly matching your unique furnace linings and operating environments.
Mag Carbon Brick Composition & Core Benefits
Magnesia carbon bricks compositions are premium fused magnesia, natural flake graphite, phenolic binder, and antioxidant additives to maximize furnace lining life.
- Magnesia (MgO): Provide 2,800°C melting resistance and repels basic slag corrosion (CaO/SiO2).
- Flake Graphite (C): Create a slag-resistant “non-wetting” barrier and offers superior resistance to thermal shock spalling.
- Phenolic Resin Binder: Pyrolyze to build a rigid, high-strength carbon-bonded backbone.
- Antioxidant Additives: Sacrificially protect graphite from oxidation while expanding to seal micro-pores against slag penetration.
High Praise from Global Steelmakers and High-temp Industries
Driven by superior quality and exceptional slag resistance, REBO MgO-C brick have been successfully exported to major steelmaking hubs worldwide, including Indonesia, South Korea, UAE, Oman, Saudi Arabia, Russia, Italy, Germany, Poland, Brazil, Mexico, and Egypt.
Operating under diverse and demanding furnace conditions, REBO magnesium carbon bricks have earned high praise and trust from our global customers for their exceptional thermal stability, extended service life, and consistent performance. If you wanna know more information about this product, contact us.
Choose the Right Magnesite Carbon Bricks for Your Steelmaking Needs
| Application Area/Operating Conditions | Core Requirements & Pain Points | Recommended Grades |
|---|---|---|
| Ladle Slag Line | Excellent resistance to basic slag chemical erosion and high-temperature erosion | MT-14C/MT-18C/MT-18D |
| Ladle Wall/Bottom | Resistance to thermal shock spalling, mechanical erosion, and heat loss control | MT-10A/MT-10B/MT-14B |
| Converter Trunnion & Charge Side | Resistance to scrap impact, severe thermal shock, and high wear | MT-14C/MT-18D |
| Clean Steel/Ultra-Low Carbon Steel Ladle | Strict prevention of carbon pickup in molten steel | MT-5A/MT-8A |
Applications & Solutions for Magnesia Carbon Bricks
| Industry | Equipment | Application Area | Key Purpose & Operating Conditions |
|---|---|---|---|
| Steelmaking | Converter/BOF | • Slag line | Resist strong basic slag corrosion, high-temperature mechanical impact, and severe thermal shock. |
| • Trunnion area | |||
| • Taphole & charging side | |||
| Electric Arc Furnace (EAF) | • Hot spots | Withstand extreme temperatures, intense thermal radiation, and severe oxidizing slag erosion. | |
| • Sidewall slag line | |||
| • Taphole (EBT) | |||
| Steel Ladle | • Ladle slag line (Core area) | Prevent molten slag penetration, enduring strong stirring and thermal cycling during refining. | |
| • Mid-to-upper sidewall (Metal Zone) | |||
| Secondary Refining(LF/VD/VOD) | • Vacuum & slag corrosion zones | Endure harsh conditions like frequent fluxing, intense stirring, and long residence times at high temperatures. | |
| Non-Ferrous Smelting | Al/Ni/Cu/Pb/Zn Smelting Furnaces | • Slag line zone | Resist chemical corrosion from non-ferrous slag and matte. |
| • High-corrosion lining | |||
| Refractory Raw Material Industry | High-Temp Industrial Kilns | • High-wear & severe erosion zones | Resist localized high-temperature mechanical wear and slag erosion. |
Strict Quality Control of Magnesia Carbon Bricks
Raw Materials & Quality Control
Raw Material Advantage: Long-term stable partnership with high-purity magnesia bases in Yingkou/Haicheng, Liaoning (e.g., 97% or 98% fused magnesia).
Graphite Quality: High-purity natural flake graphite with high fixed carbon (≥ 95-98%) and strong oxidation resistance.
Consistent Quality: Strict raw material inspection (chemical analysis) to guarantee stable quality for every batch.
Automated & Advanced Equipment
Molding Equipment: 12 CNC fully automatic hydraulic presses. High-tonnage presses ensure high density and ultra-low porosity.
Efficient Mixing System: Fully automatic intensive mixers and automatic liquid/resin dosing systems for uniform mixing.
Drying & Heat Treatment: Automated temperature-controlled drying tunnel kilns for full binder curing and high brick strength.
Laboratory & Authorized Certifications
System Certifications: Certified by ISO 9001, ISO 14001, and ISO 45001.
CNAS Testing Center: National-level laboratory with complete testing equipment.
Third-Party Reports: Ready to provide COA reports from SGS, TÜV, or BV about magnesia brick.
Customization & Technical Services
Custom Formulas: Custom carbon content (5%–18%) and antioxidants (Al, Mg-Al, B4C) based on working conditions (temperature, slag basicity, blowing rhythm).
Lining Design: Professional engineering team providing 3D lining designs for ladles and converters.
On-Site Technical Guidance: Overseas technical support for bricklaying, heating-up, and post-use analysis.
Why Choose Us for Magnesia Carbon Bricks?
- Strong Production Capacity: Annual production capacity exceeds 50,000 tons. We ensure stable supply for large orders.
- High-Temperature Firing Equipment: Equipped with 2 ultra-high temperature tunnel kilns (1800°C). We guarantee excellent physical and chemical performance.
- Advanced Molding Machines: Operating 12 high-tonnage pressing machines. We deliver high density and ultra-low porosity bricks.
- Direct Magnesia Carbon Bricks Manufacturer Advantages: Factory-direct magnesia carbon bricks prices, strict quality control, and fast global delivery.
Magnesia Carbon Brick vs. Other Carbon Bricks
| Product | Main Components | Core Characteristics | Primary Applications |
|---|---|---|---|
| Magnesia Carbon Brick | MgO + Flake Graphite (C) | Superior basic slag resistance, high thermal shock stability, non-wetting to steel. | Converters, EAF working linings, Ladle slag lines. |
| Anti-Corrosion Carbon Brick | Graphite/Anthracite + Resin/Pitch Binder | Excellent acid & solvent resistance, ultra-low porosity (not for high-temp oxidation). | Chemical linings, reaction kettles, phosphoric acid plants, electrolysis cells (<400℃). |
| Dolomite Carbon Brick | MgO + Calcia (CaO) + Graphite | Purifies steel (desulfurization/dephosphorization), good slag resistance, highly prone to hydration. | Refining furnaces (AOD/VOD), clean steel & ultra-low carbon steel production. |
| Alumina Magnesia Carbon Brick | Corundum (Al2O3) + MgO + Graphite | Forms in-situ spinel (MgAl2O4) at high temps, micro-expansion prevents joint leaks, high spalling resistance. | Ladle side walls & bottom (non-slag line zones). |
FAQs of Magnesia Carbon Bricks
Q: What Are Magnesia Carbon Bricks Made Of?
Q: What Are the Key Applications of Magnesia Carbon Refractory Brick?
Converters / BOF: Slag line, trunnion area, taphole.
Electric Arc Furnaces (EAF): Hot spots, sidewall slag line.
Steel Ladles: Slag line, sidewalls.
Secondary Refining (LF/VD/VOD): Vacuum and slag corrosion zones.
View some installation site video on YouTube.
Q: What Carbon Content Do You Offer?
Q: Why Is Graphite Added to Magnesia Carbon Refractory Brick?
Q: How Do You Prevent the Graphite from Oxidizing at High Temperatures?
Q: What Is Your Annual Production Capacity?
Q: Can You Provide Customized Magnesia Carbon Refractory Brick Shapes and Designs?
Q: Do You Provide Third-Party Test Reports for the Magnesia Carbon Refractory Brick?
Q: How Are the Magnesia Carbon Refractory Brick Packaged for Ocean Shipping?
Q: How to Use Magnesia Carbon Refractory Brick Properly?
Proper Installation: Ensure tight brick joints during masonry work. Use matching refractory mortar if required.
Controlled Heating Up: Follow a strict heating curve during furnace warmup. Avoid rapid temperature increases to prevent thermal spalling.
Operation Control:Maintain stable operating temperatures. Avoid sudden cooling and heating cycles.
Slag Management: Control slag alkalinity ($\text{CaO}/\text{SiO}_2$ ratio). Keep the slag basic to reduce chemical erosion.
Q: How to Extend the Service Life of Magnesia Carbon Refractory Bricks?
A: You can maximize their lifespan through the following methods:
Choose the Right Grade: Match the carbon content (5-18%) and antioxidants (Al, Mg-Al, B4C) to your specific furnace zones.
Use Premium Raw Materials: Select bricks made with high-purity fused magnesia and high-carbon flake graphite.
Apply Slag Splashing/Guntech: Use slag splashing technology or regular gunning repairs for converters to protect the brick surface.
Reduce Slag Penetration: Optimize brick density and minimize open porosity during manufacturing.
Avoid Mechanical Damage: Control scrap charging and molten steel tapping speeds to reduce physical impact.
Q: What is Magnesia Carbon Bricks Manufacturing Process?
Pressing: Compress the mixture into bricks under heavy hydraulic press pressure (600–1600+ tons) to remove air and maximize density.
Curing: Bake at 200°C–250°C for 12–24 hours to harden the resin binder—no high-temperature firing required.
Inspection: Quality-check density and strength before packaging.
