Description
Magnesia carbon brick is a kind of non-burning carbon composite refractory material made from high-melting-point basic oxide magnesia and high-melting-point graphite, which is resistant to slag penetration，adding various non-oxide additives and combining with carbonaceous binder. As a composite refractory material, magnesia carbon bricks effectively combine the strong slag resistance of magnesia with the high thermal conductivity and low thermal expansion of carbon, thereby compensating for poor spalling resistance of magnesia. Their main features include excellent high-temperature performance, strong slag resistance, good thermal shock resistance, and low high-temperature creep.
Advantages
Excellent Basic Slag Resistance
High-purity magnesia gives the brick strong resistance to basic slag corrosion, making it suitable for steelmaking furnaces and ladles with aggressive slag conditions.
Good Thermal Shock Stability
The graphite content improves thermal shock resistance, helping the brick withstand rapid temperature changes during tapping, refining and furnace operation.
Low Wettability by Molten Steel and Slag
Graphite reduces penetration by molten steel and slag, helping maintain lining integrity and extend service life.
High Strength and Erosion Resistance
The dense structure and resin-bonded matrix provide good cold crushing strength and erosion resistance in high-wear areas.
Improved Oxidation Resistance
Antioxidants can be added to reduce graphite oxidation during high-temperature service, especially in slag line and hot spot applications.
Customizable Formulation
MgO content, carbon content, additives, brick shape and dimensions can be adjusted according to different working conditions.
Specifications
Below are the technical specifications for magnesia carbon Bricks.
| Grade | Item | ||||||
| Open Porosity / % ≤ | Bulk density / (g·cm³) ≥ | CCS / MPa | High-temp Modulus of Rupture (1400℃×0.5 h) / MPa ≥ | ω(MgO)/ % ≥ | ω(C)/ % ≥ | ||
| MT-5A | 5.0 | 3.10 | 50.0 | — | 85.0 | 5.0 | |
| MT-5B | 6.0 | 3.02 | 50.0 | — | 84.0 | 5.0 | |
| MT-5C | 7.0 | 2.92 | 45.0 | — | 82.0 | 5.0 | |
| MT-5D | 8.0 | 2.90 | 40.0 | — | 80.0 | 5.0 | |
| MT-8A | 4.5 | 3.05 | 45.0 | — | 82.0 | 8.0 | |
| MT-8B | 5.0 | 3.00 | 45.0 | — | 81.0 | 8.0 | |
| MT-8C | 6.0 | 2.90 | 40.0 | — | 79.0 | 8.0 | |
| MT-8D | 7.0 | 2.87 | 35.0 | — | 77.0 | 8.0 | |
| MT-10A | 4.0 | 3.02 | 40.0 | 6.0 | 1.0 | 80.0 | 10.0 |
| MT-10B | 4.5 | 2.97 | 40.0 | — | 79.0 | 10.0 | |
| MT-10C | 5.0 | 2.92 | 35.0 | — | 77.0 | 10.0 | |
| MT-10D | 6.0 | 2.87 | 35.0 | — | 75.0 | 10.0 | |
| MT-12A | 4.0 | 2.97 | 40.0 | 6.0 | 1.0 | 78.0 | 12.0 |
| MT-12B | 4.0 | 2.94 | 35.0 | — | 77.0 | 12.0 | |
| MT-12C | 4.5 | 2.92 | 35.0 | — | 75.0 | 12.0 | |
| MT-12D | 5.5 | 2.85 | 30.0 | — | 73.0 | 12.0 | |
| MT-14A | 3.5 | 2.95 | 38.0 | 10.0 | 1.0 | 76.0 | 14.0 |
| MT-14B | 3.5 | 2.90 | 35.0 | — | 74.0 | 14.0 | |
| MT-14C | 4.0 | 2.87 | 35.0 | — | 72.0 | 14.0 | |
| MT-14D | 5.0 | 2.81 | 30.0 | — | 68.0 | 14.0 | |
| MT-16A | 3.5 | 2.92 | 35.0 | 8.0 | 1.0 | 74.0 | 16.0 |
| MT-16B | 3.5 | 2.87 | 35.0 | — | 72.0 | 16.0 | |
| MT-16C | 4.0 | 2.82 | 30.0 | — | 70.0 | 16.0 | |
| MT-18A | 3.0 | 2.89 | 35.0 | 10.0 | 1.0 | 72.0 | 18.0 |
| MT-18B | 3.5 | 2.84 | 30.0 | — | 70.0 | 18.0 | |
| MT-18C | 4.0 | 2.79 | 30.0 | — | 69.0 | 18.0 | |
Product Size: We offer refractory brick sizes that comply with ISO, EN, ASTM, JIS, etc, and customized sizes.
Applications of Magnesia Carbon brick
Magnesia carbon bricks are essential refractory materials widely used in metallurgical applications including converters, AC/DC electric arc furnaces, ladles, hot metal ladles, and torpedo cars.
These high-performance bricks excel in critical working zones such as ladle slag lines, molten pools, and ladle bottoms, delivering superior service life compared to conventional refractory materials. Notably, magnesia carbon bricks achieve exceptional durability in slag line applications, significantly outperforming alternative refractories.
Our services: refractory technicians, refractory installation drawings, refractory bricks and castables, refractory masonry services, refractory mixes and precast cell, special shaped bricks, insulation materials, installation supervision, accident investigation and resolution, other customized services.
Customization Service
JHYRef provides customized magnesia carbon brick solutions for different steelmaking applications. Our technical team can help customers select suitable MgO-C brick grades according to furnace type, slag composition, operating temperature and lining design.
Available customization options include:
- MgO and carbon content adjustment
- Antioxidant formulation adjustment
- Standard and special shapes
- Brick size customization
- Packaging for export shipment
- Technical support for refractory lining projects
