The main difference between steel fiber castable and ordinary castable lies in composition, performance and use. The following are specific comparisons:

I. Composition and preparation

Ordinary castable: It is composed of refractory aggregate, powder, binder (such as aluminate cement) and additives, and steel fiber is not added.

Steel fiber castable: On the basis of ordinary castable, heat-resistant steel fiber is added. The addition of steel fiber is usually 0.6% ~ 2.5% of the weight of castable, which is used to enhance the toughness of the material.

II. Performance

Strength and toughness:

Ordinary castable: it has certain strength and wear resistance, but its toughness is relatively low, and it is easy to crack under high temperature and mechanical impact.

Steel fiber castable: due to the reinforcement of steel fiber, its tensile strength, flexural strength and impact strength are significantly improved, and its toughness is better.

III. Thermal shock resistance:

Ordinary castable: the thermal shock resistance is average, and it is easy to crack or peel off when the temperature changes sharply.

Steel fiber castable: Steel fiber can disperse thermal stress, improve the thermal shock resistance of materials and reduce crack propagation.

IV. Wear resistance:

Ordinary castable: wear resistance is better, but not as good as steel fiber castable.

Steel fiber castable: It has stronger wear resistance, and is especially suitable for the parts washed by solid particles in high temperature environment.

V. Uses

Ordinary castable: suitable for lining of general high-temperature industrial kilns, such as tunnel kilns, glass kilns and ceramic kilns.

Used in some parts with low requirements for wear resistance and thermal shock resistance.

Steel fiber castable: widely used in high-temperature smelting equipment, such as electric furnace top, ladle cover, heating furnace top and so on.

Components used to contact with high-temperature melt, such as tapping trough of electric furnace and hot metal desulfurization agitator.

Suitable for parts with frequent temperature changes and large mechanical impact, such as furnace outlet of circulating fluidized bed boiler and cyclone separator.

VI. Construction and use

Ordinary castable: after adding proper amount of water and stirring evenly during construction, it is molded by pouring, vibrating or ramming.

Steel fiber castable: during construction, it is necessary to ensure the uniform dispersion of steel fibers and avoid centralized accumulation. The curing and baking process after construction is similar to that of ordinary castable.

VII. Summary

Steel fiber castable is a high-performance refractory reinforced by adding steel fiber on the basis of ordinary castable, which has higher strength, toughness and thermal shock resistance, and is especially suitable for complex working conditions with high temperature, high wear and frequent temperature changes.