熔鉄豫備処理用 Al₂O₃-SiC-C系 耐火物 開發

As there is a growing trend to make high quality steel, improving production efficiency and utilizing slag as resources, the technologies of hot metal pretreatment have been progressed to meet these demands. Although mill scale, Na₂CO₃ and CaO used as fluxes proved to be excellent agents, they can severely corrode refractories such as chamotte and high alumina for torpedo or open ladle car. Thus it was considered necessary to develop new refractories which can endure such conditions. Desulfurization fluxes vastly used in POSCO are CaCO₃ and CaO. Recent trials have been made by testing phenol resin bonded Al₂O₃-SiC-C bricks in torpedo ladle car for hot metal pretreatment. The results showed that the life of this brick became about 1.2 times longer than that of foreign products. And the crushing strength, M.O.R., corrosion resistance and oxidation resistance were tested.