MgO-CaO-C Brick

The MgO-CaO-C Brick represents a sophisticated refractory solution that has become increasingly important in modern steelmaking. The addition of CaO to the MgO-C system provides unique properties that address specific steelmaking requirements. Cavalry understands that steel producers need refractories that not only withstand aggressive conditions but also contribute to steel quality. These magnesia-calcia-carbon refractories meet these demands through carefully balanced compositions and precise manufacturing processes.

The MgO-CaO-C system offers distinct advantages over conventional MgO-C refractories. The calcium oxide component provides enhanced resistance to low-basicity slags, which can be particularly aggressive to traditional magnesia-based refractories. Additionally, the CaO contributes to the removal of phosphorus and sulfur during ladle refining, supporting the production of high-quality steel grades. The free lime content can also absorb alumina inclusions, improving steel cleanliness. This combination of chemical stability and metallurgical functionality makes MgO-CaO-C refractories particularly valuable for secondary steelmaking applications.

The four series (20, 30, 40, and 50 series) provide flexibility for different operational requirements. The 20 series with 18% CaO and 62-68% MgO offers a balanced formulation for standard ladle applications. The 30 series with 28% CaO and 47-58% MgO provides increased calcia content for enhanced slag resistance. The 40 series with 38% CaO and 37-48% MgO delivers high calcia content for demanding applications. The 50 series with 48% CaO and 32-38% MgO offers maximum calcia content for specialized requirements.

Each series includes three carbon levels (3, 6, and 9% carbon), allowing selection of optimal non-wetting properties. The total impurities (F+A+S) are tightly controlled at ≤3%, ensuring high purity and consistent refractory performance. Bulk density ranges from 2.9 to 3.0 g/cm³, while apparent porosity of 8-9% provides a dense structure that resists slag penetration. Cold crushing strength of 30-35 MPa ensures adequate structural integrity.

Product highlights

Four Series for Comprehensive Application Coverage
The MgO-CaO-C brick range includes 21 grades across four series: 20 series (18% CaO), 30 series (28% CaO), 40 series (38% CaO), and 50 series (48% CaO). This extensive range allows steelmakers to select the optimal CaO content for specific steel grades and slag conditions. Higher CaO grades provide enhanced resistance to low-basicity slags.

Enhanced Slag Resistance
The calcium oxide component provides superior resistance to low-basicity slags that can be aggressive to conventional refractories. The CaO content also contributes to the removal of phosphorus and sulfur during ladle refining. This dual functionality supports both refractory durability and steel quality.

Three Carbon Levels per Series
Each series includes three carbon levels (3%, 6%, and 9%) for optimized non-wetting properties. Lower carbon grades provide higher MgO+CaO content for maximum chemical resistance. Higher carbon grades offer enhanced thermal shock resistance and slag penetration protection.

High Purity with Low Impurities
Total impurities (F+A+S) are tightly controlled at ≤3% across all grades, ensuring high purity and consistent refractory performance. The low impurity levels reduce the risk of contamination in high-quality steel grades. The high purity also contributes to improved slag resistance and service life.

Excellent Bulk Density
Bulk density ranges from 2.9 to 3.0 g/cm³ across the product range, providing dense structures for corrosion protection. Higher density grades offer maximum resistance to slag penetration. The consistent density supports predictable refractory performance.

Low Apparent Porosity
Apparent porosity of 8-9% provides a dense structure that resists slag penetration and chemical attack. The low porosity reduces pathways for corrosive slag penetration. The dense structure also supports better thermal conductivity and thermal shock performance.

Good Cold Crushing Strength
Cold crushing strength of 30-35 MPa across all grades ensures adequate structural integrity during installation and service. The consistent strength provides reliable handling characteristics and installation performance.

Metallurgical Benefits for Steel Quality
The CaO component contributes to the removal of phosphorus and sulfur during ladle refining, supporting the production of high-quality steel grades. The free lime can also absorb alumina inclusions, improving steel cleanliness.