High Strength Iron Refractory Runner Castable for Steel Making Alumina-Silicon Carbide System. High Strength Iron Refractory Runner Castable for Steel Making is based on alumina-silicon carbide system, with aluminate binder, antioxidant, anti-explosion fiber and additives added. It features excellent resistance to hot metal scour, slag erosion, thermal shock, penetration and oxidation. The high-strength iron runner castable is applicable to main runners and branch runners of small and medium-sized blast furnaces, heavy-load runners of large blast furnaces,and special-shaped trenches. It offers high cost performance, large iron throughput and long service life. Featuring high structural strength, it resists scouring by high-speed hot metal flow and spalling caused by molten slag erosion. The material allows easy repair and construction, effectively extending the service cycle of iron runners.