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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 improving the basicity of slag and the content of CaF2 and Li2O in the slag, the mold fluxes of medium carbon steel slabs were optimized and the industrial test of increasing the pulling speed was carried out by using the optimized mold fluxes. The results showed that the optimized mold flux had higher crystallization temperature, lower viscosity and melting point. During the test, the thickness of slag layer increased by about 2 mm and the unit consumption increased by 0.03 kg / m2. Mold flux at 1.5 m / min pulling speed and the use of raw slag casting speed 1.3 m / min casting, mold heat transfer strength, heat transfer stability and cast slab quality and other projects at the same level.