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| Influence of MgOBased and Al2O3Based Refractories on Inclusions in Molten Steel |
| TAO Shaoping1,2,ZHONG Xiangchong1 |
| 1. High Temperature Ceramics Institute, Zhengzhou University, Zhengzhou 450052, Henan, China; 2. Technology Academy, Shougang Group, Beijing 100041, China |
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Abstract The influence of MgOCaO, MgOAl2O3 and Al2O3MgO 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 MgOCaO refractory is stronger than that of MgOAl2O3 and Al2O3MgO; the optimum CaO content is 30%40% in MgOCaO refractory. When Al2O3MgO refractory was used, the amount of inclusions was increased by 50% during holding,with an increase in size to 100900 μm,the their hardness of inclusious was high; the composition was mainly SiO2 and Al2O3. With use of MgOAl2O3 refractory, amount of inclusions was decreased by 30%, with a size of 80450 μm and hardness of inclusions was lower; the composition was mainly SiO2, MnO, CaO and MgO.The use of MgOCaO refractory was effective to reduce quantity (by 70%) and size (to 30350 μm) of inclusions with lower hardness;the inclusions were mainly CaO, Al2O3, SiO2 and FeO.
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Received: 01 January 1900
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2007, Vol. 42 
