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Adding steel fibers to refractory castables can improve the wear resistance, thermal shock resistance, and bending strength of the castables, which are favored by customers.
The addition of steel fibers can increase the wear resistance of refractory materials, improve the thermal shock resistance and bending strength of castables, etc. Adding steel fibers to refractory castables combines the advantages of the two materials and is favored by customers. Steel fiber castables’ ratio and application are the keys to the product. An excellent ratio can not only improve the various properties of the castable but also embody environmental protection.
In the ratio and application of steel fiber castables, the steel fibers used for refractory castables generally have a diameter of 0.4-0.5mm and a length of 25mm. The shape and cross-section of the steel fiber are crescent-shaped. The amount of steel fiber added to the castable is 1-5% (by weight), and the length and amount of steel fiber should be appropriate.
Generally, water is added to the mixture first, and then steel fiber is added for full stirring. It not only makes the mixture evenly stirred, but also saves 1/3 of the stirring time compared with stirring in the dry material where the steel fiber is placed. The molding can be vibrated externally, or a vibrating rod can be used to vibrate inside the mixture, and compact products can also be obtained. The maintenance and drying of steel fiber castables are the same as ordinary castables.
Steel fiber castables can improve mechanical strength after heat treatment. The use of steel fiber castable can improve the mechanical strength of castables, especially the medium temperature strength. After burning at 1100°C for 3 hours, the compressive strength can increase by +41%. This is because the castables rely on hydraulic products to obtain strength at low temperatures. At high temperatures, the hydraulic bonding strength is replaced by ceramic bonding. Therefore, castables have higher strength at low and high temperatures, but at medium temperatures, the hydraulic bonding strength is lost due to the dehydration of the hydration product, and the ceramic bonding has not yet been fully formed. , therefore, steel fibers play an important role at medium temperatures.
Steel fiber refractory castables are used in boilers and furnace outlets, tops, side walls, etc., and are widely used in steel, metallurgy, chemical, and building materials industries. Refractory castables are also called unshaped refractory castables. The method of use is basically the same as the use of concrete. After the selected formula and raw materials have been mixed and processed evenly, they can be compacted with a vibrating rod and then cured and heated. Due to the particularity of the use of unshaped castables, according to the site Depending on the conditions, the construction quality of the castable also needs to be guaranteed.
On the basis of using high-alumina clinker as aggregate and powder for its important part, the characteristics of appropriate steel fiber reinforced refractory castable are high strength, good toughness, good thermal shock stability, spalling resistance, and resistance It has the characteristics of strong abrasive performance, and is used in the part where the temperature gradient change is more likely to cause damage to the furnace wall.
What should I do if the refractory material cracks, falls off, and is easy to wear? If you want to solve the problem, you need to dig from the source and analyze the real reason. Hongji Refractory has been engaged in refractory production and research and development services for many years. The refractory material manufacturer produces tundish lining bricks, which effectively guarantees the normal operation of the tundish. The operation reduces heat loss, and the heat loss can be reduced by 25% compared with the same period of last year, which effectively improves the utilization rate and improves product quality. It can solve various difficult problems of high-temperature kiln lining. Welcome new and old customers to visit our factory!
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