通过提高保护渣碱度以及渣中CaF2和Li2O含量，对中碳钢板坯用保护渣进行了优化，并采用优化的保护渣进行了提高拉速工业试验。结果表明：优化的保护渣具有较高结晶温度、较低的粘度和熔点；试验过程中，采用优化的保护渣液渣层厚度平均增加约2 mm，单耗增加0.03 kg/m2；采用优化的保护渣在1.5 m/min拉速下和采用原渣在1.3 m/min拉速下浇铸时，结晶器传热强度、传热的稳定性以及浇铸出的铸坯质量等项目水平相当。
By increasing basicity and contents of CaF2 and Li2O, the mold flux for medium carbon steel slab casting was optimized.The optimized flux was adopted in plant trial of increasing castingspeed.The results showed that optimized flux has higher crystallization temperature，lower viscosity and melting point.In plant trial，liquid optimized flux thickness increased by 2 mm approximately，slag consumption increased by 0.03 kg/m2.At a casting speed of 13 m/min，heattransfer intensity，stability and slab quality cast with traditional flux were almost the same as cast with optimized flux at a casting speed of 15 m/min.
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