65Mn钢LF精炼渣系优化及工业试验

LF Refining Slag System Optimization and Industrial Testing for 65Mn Steel

为了研究适合高洁净度高碳钢的LF精炼渣渣系,通过FactSage热力学软件计算精炼渣碱度(R)、(CaO)/(Al_(2)O_(3))对精炼渣熔点的影响,得出最合适的精炼渣成分。根据热力学计算的精炼渣成分,降低原有渣系的钙铝比,并将优化的渣系成分用于65Mn钢工业试验。结果表明:优化后的精炼渣系成分质量分数为CaO52%~58%、Al_(2)O_(3)28%~33%、SiO_(2)8%~12%、MgO5%~7%、R=4~6、(CaO)/(Al_(2)O_(3))=1.5~2;使用该渣系进行工业试验,LF出站时的T.[O]可达7×10^(-6)~13×10^(-6),RH出站时的T.[O]可达6×10^(-6)~12×10^(-6);钢中全氧质量分数基本可控制在10×10^(-6)内;65Mn钢卷中的B类细系夹杂均不大于1级,达到高级优质钢要求。

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