The electric furnace cover is suitable for steel fiber refractory castables.
Because the electric furnace cover works under high temperature erosion and rapid cooling and rapid heating, the service conditions are quite harsh. Building with high alumina bricks is prone to peeling off due to electrical holes. The steel fiber reinforced castable has excellent thermal shock resistance, high temperature melt erosion resistance, good volume stability at high temperature, and good strength in high temperature structures.
Adding a certain proportion of heat-resistant steel fibers in the castable can improve the stress resistance of the castable, improve the toughness of the castable, and the steel fiber castable has good thermal shock stability, crack resistance and spalling resistance. Reasonable maintenance after construction can better prolong the service life of the furnace cover.
Therefore, it is best to use steel fiber castables for refractory castables for electric furnace covers.
Because steel fibers can improve the strength at medium and high temperatures, adding steel fibers to the castable can reduce the residual shrinkage of the furnace cover after heating. The cover of the electric furnace has also been built with high-alumina bricks. Due to the complex smelting environment and the fire in the area of the electric hole, the high-alumina bricks are prone to peeling off during use.
The performance of the steel fiber castable is better than that of the first-grade high-alumina brick. After pouring, the surroundings of the electric-grade hole are always intact, and the service life of the furnace cover will be increased by about 15% compared with the original high-alumina brick. Steel fiber reinforced castables have strong tensile crack resistance, and are not easy to crack and peel off during use; and they are also quite resistant to high-temperature melt erosion and high-temperature volume stability.
When producing steel fiber castables, pay attention to the good fluidity of new cement, because the compressive strength and flexural strength of castables made with old cement will decrease after drying. Fluidity and setting speed are not as good as new cement.
Therefore, when preparing castables, newly produced cement must be used as a binder to enhance the strength and tensile capacity of steel fiber refractory castables.
Procurement Electric Furnace Cover selection LMM YOTAI