材料期刊网

利用大样电解、图像分析、扫描电镜和能谱分析等检测手段研究了82B钢种选用Al2O3MgO、MgOAl2O3和MgOCaO炉衬在1450 ℃保持80 min后生成的夹杂物种类和变化。结果表明，采用Al2O3MgO作内衬时冶炼后钢中夹杂物的数量增加了近50％，夹杂物的尺寸大(100～900 μm)且硬度很高，夹杂物的主要成分为SiO2和Al2O3；以MgOAl2O3作内衬时夹杂物数量略有降低（30%），尺寸(80～450 μm)和硬度相对较小，其主要成分为SiO2、MnO、CaO和MgO；而MgOCaO材料对去除钢中夹杂物（降低70%）和降低其尺寸(30～350 μm)有明显效果，且夹杂物的硬度很小，其主要成分为CaO、Al2O3、SiO2和FeO。采用MgOCaO材料时夹杂物的尺寸最小、数量最少，对钢水洁净度的贡献最大。

The influence of MgOCaO, MgOAl2O3 and Al2O3MgO refractories on inclusion content and composition of 82B steel was studied. The change in inclusion type and size in the samples taken after holding molten steel in refractory crucible of induction furnace at 1450 ℃ for 80 min was investigated by means of SOLIM worker, image analysis, SEM and EDAX. It was found that the effect for reducing nonmetallic inclusions content of MgOCaO refractory is stronger than that of MgOAl2O3 and Al2O3MgO; the optimum CaO content is 30%40% in MgOCaO refractory. When Al2O3MgO refractory was used, the amount of inclusions was increased by 50% during holding,with an increase in size to 100900 μm,the their hardness of inclusious was high; the composition was mainly SiO2 and Al2O3. With use of MgOAl2O3 refractory, amount of inclusions was decreased by 30%, with a size of 80450 μm and hardness of inclusions was lower; the composition was mainly SiO2, MnO, CaO and MgO.The use of MgOCaO refractory was effective to reduce quantity (by 70%) and size (to 30350 μm) of inclusions with lower hardness;the inclusions were mainly CaO, Al2O3, SiO2 and FeO.