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Properties and Applications of Chromia-Corundum Refractories

Release time:

2026-02-06 10:17

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Chromia corundum is a high-performance refractory material made primarily from aluminum oxide (Al₂O₃) with the addition of chromium oxide (Cr₂O₃). It ranges in color from pink to rose-red and exhibits excellent resistance to high temperatures, corrosion, wear, and thermal shock. As a result, it finds extensive application in harsh, high-temperature environments.
Classification of Chromia-Corundum Refractories
According to the Cr₂O₃ content, production process, and application, chromium corundum refractories can be mainly classified into the following categories:
1. Classification by Cr₂O₃ content (common classification method)
• Low-chromium corundum products: With a Cr₂O₃ content of approximately 5% to 15%, these are commonly referred to as chrome-corundum bricks or chrome-corundum castables. They have corundum as the primary phase, and Cr₂O₃ solid solution strengthens their toughness and resistance to erosion.
• Medium-chromium corundum products: With a Cr₂O₃ content of approximately 15% to 30%, these products offer more balanced performance and are commonly used in transition zones or moderately corrosive environments.
• High-chromium/chromic corundum bricks (or chromic bricks): Cr₂O₃ content ≥50% to over 90% (even bricks with Cr₂O₃ content ≥90% are referred to as high-chromium bricks). With Cr₂O₃ as the primary phase, these bricks exhibit extremely strong resistance to slag erosion; however, they are costly and have slightly poorer thermal shock stability.
2. Classified by production process
• Fused Chrome Corundum: Produced by high-temperature melting in an electric arc furnace, this material features dense crystals and is commonly used as an aggregate in unshaped refractories or precast components.
• Sintered Chrome Corundum: Formed by high-temperature sintering, it has a low porosity and is often manufactured into brick-shaped products.
• Amorphous chrome corundum materials: such as chrome corundum castables, ramming masses, and plastic materials.
3. Classified by Use/Shape
• Chrome corundum bricks (shaped products)
• Chrome corundum castables/precast blocks
• Chromium corundum breathable bricks, seating bricks, and nozzle bricks—functional refractory materials
• Chrome-corundum ramming material/repairing material
4. Typical applications of chrome corundum refractories

Metallurgical industry
• Working layer of the ladle, impact zone
• RH, VD, and VOD refining furnace linings
• High-erosion areas of the tundish
• Hot spot area of the electric furnace

Main advantages: Strong resistance to steel slag erosion and FeO erosion.

Nonferrous Metals and Chemical Industry
• Carbon black reactor (reaction zone, combustion zone)
• Gasifier, partial oxidation furnace
• High-temperature reactor lining

Main advantages: Stable in CO, H₂, and high-temperature reducing atmospheres.

Building materials and other high-temperature equipment
• Cement rotary kiln transition zone and burning zone
• High-temperature corrosion zone of the incinerator
• Local areas of high erosion in the glass furnace

In the critical areas of these high-temperature devices, chrome-corundum refractory materials, with their excellent overall performance, have become an important guarantee for enhancing equipment operational efficiency and reliability.

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