Bulk density; the fineness of refractory powder with particle size of 0.09 mm shall be more than 90%. Select high-quality binders, superfine powders and admixtures to make the castable dense and high-strength. Therefore, this type of castable has high strength and excellent wear resistance.

The wear-resistant refractory castable contains about 3% chromium trioxide in its properties. The formed body is fired at 1420–1480 °C, and it is used for slide rails and platforms of steel rolling heating furnaces with good application effects. If baked at 600 °C, the matrix mix proportion shall be enhanced to ensure sintering at 1200 °C, so as to achieve sufficiently high strength and improve the wear resistance of the products.

The room-temperature wear resistance of the refractory material was tested, with a result of 2.40 cm³.Determination of high-temperature wear rate: The sample size is 40 mm × 50 mm. After drying, the sample is placed into the furnace and heated to the specified temperature, with a load of 9.8 N applied to it. The bottom surface of the sample is in contact with a rotating silicon carbide disc. When the temperature reaches the required value, the silicon carbide disc starts rotating and grinds the sample for a specified duration. The sample is then cooled along with the furnace. After being taken out, the mass loss of the sample is weighed, and the high-temperature wear rate is calculated accordingly.

Determination of room-temperature wear loss: The sample size is 10 mm × 150 mm × 30 mm. After being treated at 540 °C, the sample is mounted on a room-temperature grinding disc. With a load of 200 N applied, the disc is first rotated 40 cycles, and the surface wear loss is measured to be 0.44 kg/m², while that of the imported material is 1.32 kg/m². After another 40 rotation cycles, the inner-layer wear loss is determined to be 0.88 kg/m², in contrast to 164 kg/m² of the imported material.

In conclusion, there are numerous testing methods for the wear resistance of refractory castables, and these methods are not comparable with one another. Only when the process conditions and testing methods of the castables are consistent can the quality of their wear resistance be evaluated.