Premium magnesia carbon bricks combining high-purity magnesia (MgO ≥70%) with graphite carbon (10%–20%), engineered for the most demanding steelmaking vessel applications. Delivers exceptional thermal shock resistance, superior slag corrosion resistance, and high thermal conductivity for extended campaign life in converters, electric arc furnaces, and steel ladles.
Magnesia carbon bricks represent the pinnacle of refractory technology for steelmaking vessel applications, where operating conditions push materials to their absolute limits. By combining high-purity fused or sintered magnesia aggregate with carefully graded graphite flake additions of 10% to 20%, these bricks achieve a unique synergy: the extraordinary refractoriness and basic slag resistance of magnesia, coupled with the exceptional thermal conductivity, non-wettability, and thermal shock resistance of graphite. This combination has made magnesia carbon bricks the dominant refractory choice for basic oxygen furnace (BOF) converters, electric arc furnaces (EAF), and steel ladles worldwide.
In BOF converter service, magnesia carbon bricks face some of the harshest conditions in the entire steelmaking process. During the blowing cycle, the lining is subjected to temperatures exceeding 1700°C, aggressive basic slags with CaO/SiO₂ ratios above 3, violent metal-slag emulsions, and the mechanical impact of scrap charging. The graphite component in the brick provides critical protection by forming a dense, continuous carbon network that molten slag cannot wet or penetrate. Simultaneously, the magnesia matrix undergoes controlled in-situ reactions that form a protective densified layer at the hot face, further retarding corrosion. Campaign lives of 15,000–25,000 heats are routinely achieved in modern BOF converters using optimized magnesia carbon brick compositions.
Our magnesia carbon bricks are manufactured using premium-grade fused magnesia (MgO purity ≥97%) and high-purity large-flake graphite, pressed at 200–300 MPa and tempered at controlled temperatures to optimize the carbon bond structure. Each production batch undergoes rigorous quality control including chemical analysis, bulk density verification, cold crushing strength testing, and microscopic examination for microstructure uniformity. The very low apparent porosity (≤5%) is critical for minimizing slag penetration depth and ensuring consistent wear rates throughout the campaign, ultimately delivering the lowest cost per ton of steel produced for our customers.
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