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通过优化调整保护渣成分,保护渣熔点由1 222降至1 188℃,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Al_2O_3夹杂后,保护渣熔化温度、黏度的影响规律,发现当添加Al_2O_3为12%时,保护渣A熔化温度最高至1 259℃;保护渣B熔化温度为1 203℃,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Al_2O_3夹杂。
By optimizing the composition of the flux, the melting point of the flux decreased from 1 222 to 1 188 ℃, the viscosity increased from 0.26 to 0.32 Pa · s, and the industrial test was carried out. Aspex was used to detect inclusions larger than 2μm in different parts of the ingot. The inclusions at the edge of the blank and at ¼ width, ½ width and ½ thickness decreased, while the temporary blocking rate of the hot rolled coil decreased from 4.51% to 2.55%. The reasons for the decrease of inclusions in different parts of the cast slab after the improved mold powder were analyzed, and the effect of the inclusion powder with different mass fraction of Al2O3 on the melting temperature and viscosity of the mold powder was studied. It was found that when the amount of Al_2O_3 was 12% The melting temperature of mold powder A is up to 1 259 ℃. The melting temperature of mold powder B is 1 203 ℃. The viscosity of mold powder A and B are 0.79 and 0.59 Pa · s, respectively. Excessive viscosity is not good for the adsorption of Al 2 O 3.