Steel-fiber silicon carbide castable uses a corundum matrix with Al₂O₃ ≥85% compounded with silicon carbide and added heat-resistant stainless steel fibers. It combines high-temperature resistance, extremely strong wear and scouring resistance, and excellent thermal-shock stability, effectively inhibiting crack propagation and preventing lining spalling. It resists alkaline flue-gas erosion, is not prone to buildup, and is suitable for high-load linings such as cement kiln mouths, grate coolers and tertiary-air ducts, greatly extending maintenance intervals.