MgO-Al2O3-C brick

The MgO-Al₂O₃-C Brick represents a sophisticated refractory solution developed for steelmaking applications where magnesia-based materials provide optimal performance. Cavalry understands that modern steel production demands refractories that withstand extreme temperatures, chemical attack, and mechanical stress. These magnesia-alumina-carbon refractories address these challenges through carefully balanced compositions and precise manufacturing processes.

The MgO-Al₂O₃-C system is widely recognized for its excellent slag resistance and thermal shock stability in steel ladle applications. The high magnesia content provides outstanding resistance to basic slag attack, while the carbon component acts as a non-wetting agent that reduces slag penetration and improves corrosion resistance. The alumina addition enhances thermal shock resistance and provides additional chemical stability in aggressive environments. This combination makes these bricks particularly suitable for ladle sidewalls, slag lines, and other areas exposed to severe slag contact.

The four available grades (ZMLT-10 through ZMLT-30) provide options for different operational requirements. The ZMLT-10 grade with 10% Al₂O₃ offers a magnesia-rich formulation for applications requiring maximum basic slag resistance. The ZMLT-15, ZMLT-20, and ZMLT-30 grades provide progressively higher alumina content for improved thermal shock resistance and chemical stability. All grades maintain 10% carbon content, ensuring consistent non-wetting properties across the product range.

The physical properties remain consistent across the grade range with slight variations. Bulk density ranges from 2.9 to 2.98 g/cm³, providing dense structures for corrosion resistance. Apparent porosity remains low at 7-8%, reducing slag penetration pathways. Cold crushing strength of 35 MPa across all grades ensures adequate structural integrity during installation and service.

These magnesia-alumina-carbon bricks are typically used in steel ladle applications where magnesia-based refractories provide optimal resistance to basic slag. The combination of high temperature resistance, chemical stability, and thermal shock resistance makes these refractories suitable for modern steelmaking processes including ladle refining and continuous casting operations.

Product highlights

Four Grade Options for Application Flexibility
The MgO-Al₂O₃-C brick range includes four grades from ZMLT-10 to ZMLT-30 with Al₂O₃ content from 10% to 30%. This range allows steelmakers to select appropriate grade for specific operational requirements. The ZMLT-10 provides maximum magnesia content for basic slag resistance, while higher grades offer improved thermal shock stability.

High Carbon Content for Superior Non-Wetting Properties
All grades maintain 10% carbon content, providing exceptional non-wetting properties that reduce slag penetration and improve corrosion resistance. The high carbon content contributes to extended service life in aggressive ladle applications where slag attack is severe.

Excellent Slag Resistance
The magnesia-rich composition provides outstanding resistance to basic slag attack in ladle applications. The combination of MgO, Al₂O₃, and carbon delivers superior durability in aggressive metallurgical conditions. The high magnesia content is particularly effective against basic slag compositions.

Superior Thermal Shock Stability
The MgO-Al₂O₃-C system exhibits excellent thermal shock resistance, essential for ladle applications where bricks experience rapid temperature changes. The thermal shock stability reduces cracking and spalling, extending refractory service life and improving operational reliability.

High Bulk Density for Corrosion Protection
Bulk density ranges from 2.9 to 2.98 g/cm³ across the grade range, providing dense structures for corrosion resistance. The dense structure reduces slag penetration and slows the corrosion process, extending lining life and reducing maintenance frequency.

Low Apparent Porosity
Apparent porosity of 7-8% provides a dense structure that resists slag penetration and chemical attack. The low porosity reduces the pathways for corrosive slag to penetrate the brick structure. The dense structure supports better thermal conductivity and thermal shock performance.

Consistent Cold Crushing Strength
Cold crushing strength of 35 MPa across all grades ensures adequate structural integrity during installation and service. The consistent strength provides reliable handling characteristics and installation performance.

Combined MgO+Al₂O₃ Content
The combined MgO+Al₂O₃ content of 75% ensures high purity and consistent refractory performance. The high combined oxide content contributes to chemical stability and resistance to slag attack. The balanced composition provides optimal properties for steel ladle applications.

Proven Performance in Steelmaking
MgO-Al₂O₃-C bricks have demonstrated reliable performance in various steelmaking applications including ladle sidewalls, slag lines, and bottoms. The proven track record provides confidence in performance and service life.