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Engineered for extreme wear, chemical vapor attack, and severe slagging environments, our high-performance refractory bricks safeguard thermal stability and drive exceptional campaign longevity.
Modern heavy industry faces an unprecedented operational transformation. The aggressive drive toward deep decarbonization, hydrogen-fueled combustors, heightened waste-heat recovery, and secondary raw material recycling has permanently shifted the operating envelope of industrial kilns and metallurgical furnaces. In chemical synthesis reactors, hazardous waste treatment units, and advanced ladle metallurgy, peak temperatures regularly exceed 1750°C, compounded by volatile alkali vapors, molten slag baths, and intense reducing gases.
Conventional fireclay and standard alumina-silicate linings can no longer sustain these thermodynamic extremes. Corundum refractory bricks—containing over 90% to 99% pure alpha-alumina (α-Al₂O₃)—have transitioned from a premium alternative to an essential core engineering solution. As commercial operators strive to lengthen refractory campaign intervals from 12 months to multi-year horizons, pure corundum, chrome-corundum, and zirconia-corundum formulations represent the pinnacle of thermomechanical reliability, directly mitigating catastrophic kiln downtime and maximizing production yield.
Engineered through electric-arc fused synthesis and micro-grain sintering, corundum refractory bricks embody the ideal combination of hardness, chemical passivity, and thermodynamic stability.
Under mechanical loads of 0.2 MPa, corundum refractories exhibit a refractoriness under load (RUL) exceeding 1700°C. Interlocking α-Al₂O₃ crystallites resist boundary sliding, preventing structural slump or wall deformation in tall furnace shafts and heavy burner throats.
Possessing dense microstructure and micro-porosity distribution, corundum bricks withstand acidic and mildly basic liquid slags, metallic vapors, chlorine fluxes, and sulfur oxides. Molten silicates cannot easily penetrate grain boundaries to precipitate spalling.
Through precise additions of baddeleyite zirconia (ZrO₂) or mullite phases, thermal micro-cracking is arrestingly dissipated. The refractory withstands rapid temperature shocks without flaking, ideal for cyclic batches and intermittent combustion chambers.
| Refractory Classification | Al₂O₃ Content (%) | Bulk Density (g/cm³) | Apparent Porosity (%) | Refractoriness Under Load (0.2MPa, °C) | Cold Crushing Strength (MPa) |
|---|---|---|---|---|---|
| Pure Sintered Corundum Brick | ≥ 99.0% | 3.15 – 3.25 | ≤ 16% | > 1700 | ≥ 100 |
| Fused Cast AZS / Zircon Corundum | 45.0 – 55.0% (ZrO₂ ≥33%) | 3.80 – 4.05 | ≤ 2.0% | > 1720 | ≥ 300 |
| Corundum-Mullite Brick | 75.0 – 85.0% | 2.75 – 2.95 | ≤ 18% | > 1650 | ≥ 85 |
| Alumina Bubble Brick (Insulating) | ≥ 95.0% | 1.35 – 1.70 | ≤ 50% | > 1600 | ≥ 15 |
Zhengzhou SK Refractory Co., Ltd. (SK) located in Xinmi, Zhengzhou China. For over twenty years, SK Refractories has remained dedicated to delivering high-performance, reliable solutions that redefine durability and efficiency for our clients worldwide. Founded on the principles of innovation, quality, and sustainability, we proudly serve key industrial sectors including steelmaking, cement production, non-ferrous metallurgy, glass manufacturing, and petrochemical processing.
SK Refractories’ quality is embedded in every aspect of our operations, from raw material sourcing to production and delivery. We partner with trusted suppliers to secure premium-grade raw materials, leveraging advanced manufacturing processes—such as automated pressing, and controlled sintering—to ensure consistency and reliability. Our quality management system is certified to ISO 9001, reflecting our dedication to maintaining the highest standards of excellence.
SK Refractories main refractory products for industry furnace are zircon bricks, corundum brick, mullite bricks, sillimanite bricks, silica bricks, magnesia bricks, low porosity fireclay blocks, insulation bricks and etc. SK Refractories has an annual production capacity of 20,000+ tons. With scientific management, advanced technology and equipment, and strict quality control process, SK Refractories ensures the uncompromising high quality of refractory bricks for industrial furnaces worldwide.
Each high-temperature furnace operates under unique chemical, mechanical, and thermal conditions. Here is how corundum brick technology solves severe industrial operational challenges.
Secondary reformers, carbon black reactors, and coal slurry gasifiers present severe reducing gas exposure (H₂, CO) at 1450°C to 1750°C. Corundum bricks formulated with low SiO₂ (<0.2%) prevent volatile silicon reduction, preserving lining cohesion and eliminating catalyst poisoning downstream.
In modern float and container glass furnaces, superstructure crowns, forehearth channels, and regenerator checkerworks face intense alkaline vapor volatilization (Na₂O, K₂O). Sintered AZS and dense corundum-zirconia bricks resist chemical vapor wash and fluxing washouts over decade-long campaigns.
Secondary refining ladles (LF, VD, VOD) expose working linings to molten steel turbulence and highly corrosive basic slags. Corundum-spinel and chrome-corundum bricks prevent liquid slag wetting, resisting penetration and minimizing structural peeling during ladle de-slagging.
Rotary kiln incinerators process volatile chlorine, heavy metals, and molten ashes. Dense corundum bricks with low open porosity prevent liquid salt penetration, resisting thermo-chemical abrasion and extending refractory service life under continuous dynamic rotating motion.
In copper flash smelters, nickel converter furnaces, and aluminum anode baking furnaces, molten metals and fluxing agents corrode ordinary linings. High-purity corundum refractory brick ensures no molten metal infiltration and provides extraordinary mechanical resistance to thermal spall.
In ultra-high temperature sintering of technical ceramics, spark plugs, and electronic ferrites at 1650°C-1800°C, zero-furnace-atmosphere contamination is essential. High-purity corundum setter plates, saggers, and muffle bricks guarantee chemical neutrality and defect-free firing.
SK Refractories is well known in domestic markets and abroad for the quality of refractory bricks. The refractory materials produced by SK Refractories have been exported to more than 35 countries such as America, Spain, Germany, Italy, Brazil, Belgium, India, Japan, Korea, and more.
Our comprehensive product portfolio includes Silica Brick, low porosity fireclay blocks, Sillimanite Brick, Corundum Brick, Zircon Brick, Mullite Brick, Insulating Bricks, refractory castables, and refractory mortar of related materials. Through rigid raw material selection, ultrasonic porosity inspection, laser-guided dimensional tolerance verifications, and batch-wise creep testing, we ensure every brick shipped matches international ASTM, DIN, and ISO standards.
Our obligation is to supply high quality refractory materials and service to achieve long lifetime of high temperature furnaces. SK Refractories will always improve himself to provide better refractory products and service to the customers all over the world.
As furnace engineers transition from natural gas to hydrogen-enriched and oxy-fuel burners to comply with net-zero carbon directives, the thermo-chemical lining environment undergoes profound alterations.
Combusting hydrogen elevates steam concentration and flame velocity inside kiln atmospheres. Corundum refractories containing minimal trace alkalis remain immune to high-temperature water vapor hydrolysis, which routinely degrades silica-bonded linings.
Modern furnace designs combine dense corundum working linings with high-purity alumina bubble brick backups. This composite structure slashes peripheral shell heat radiation losses by up to 28%, significantly trimming annual fuel costs.
Through selective dismantling and optical sorting, spent corundum linings from steel ladles and glass tanks are reclaimed into electro-melt synthetic aggregates. This closed-loop process curtails landfilling while upholding high refractory purity.
Explore our full line of specialized refractory shapes, formulated for glass tanks, rotary kilns, petrochemical cracking units, and heavy metallurgy installations.
We sincerely welcome both new and existing international customers to cooperate with us in a friendly manner and work together to create a bright future! Whether you are designing a high-capacity petrochemical reactor, relining a glass melting tank, or upgrading cement rotary kilns, our technical team provides customized engineering support, lining design, and worldwide delivery.