通过优化调整保护渣成分,保护渣熔点由1222降至1188℃,黏度由0.26提高到0.32 Pa·s,并进行工业试验,利用Aspex对铸坯不同部位大于2μm的夹杂进行检测,发现铸坯边部和1/4宽、1/2宽、1/2厚度位置夹杂物均有所降低,同时热轧板卷表面临时封锁率由4.51%降低至2.55%.对采用改进保护渣后铸坯中不同部位夹杂物降低的原因进行分析,研究了保护渣吸附不同质量分数Al2O3夹杂后,保护渣熔化温度、黏度的影响规律,发现当添加Al2O3为12%时,保护渣A熔化温度最高至1259℃;保护渣B熔化温度为1203℃,保护渣A与B的黏度分别为0.79和0.59 Pa·s,黏度过大不利于吸附Al2O3夹杂.
By optimizing the chemical compositions of the mold flux,the melting point of the mold flux reduced from the 1222 to 1188℃,and the viscosity increased from 0.26 to 0.32 Pa·s. The conducted industrial experiments showed that>2μm inclusions detected by ASPEX scanning on the edge,1/4 width,1/2 width and 1/2 thickness all decreased af-ter the optimization of mold flux.The temporary surface blockade ratio reduced from 4.51%to 2.55%. To explain the im-provement of steel slab cleanliness after apply the optimized mold flux,the variation of melting temperature and viscosi-ty of mold flux were studied after adsorbing different mass fraction Al2O3 inclusions.It found that after adding 12%Al2O3,the melting temperatures of mold flux A and B are 1259 and 1203 ℃,respectively. While the viscosities of mold flux A and B are 0.79 and 0.59 Pa · s,respectively. Larger viscosity is harmful for the absorption of Al2O3 inclu-sions.
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