Fused Cast Refractories for Reheating Furnaces

Of late,we know that the fused cast refractories of various varieties as given the Annexure I such as fused cast mullite blocks(DF-Refratek-DM) are widely in high capacity reheating furnaces,as they have the following advantages over the high alumina refractories.

Fused cast mullite blocks (DF-Refratek-DM) with a chemical composition of 75% Al2O3,4 to 6% Zr02,17 to 19% SiO2 are directly cast into various blocks of sizes 40 to 200kgs by fusion process.Their main properties are compact crystalline structure,high refractories,absence of open porosity,high mechanical strength at elevated temperature and high wear resistance whether due to corrosion or abrasion.The additional advantage is of being easy to deslag,hot or cold without damage to the material done to the weak adherence of the oxide layers to Maxmalox.These are used in pusher type billet furnace as dry skid rails,soaking zone and discharging zone,ignot and bloom furnaces in the soaking pits where de-slagging is carried out cold in the bottom and lower parts of walls.