| The application of electromagnetic field in the metallurgical processes of iron and steel has drawn more and more attention.Electromagnetic field exists in the smelting means such as electromagnetic stirring,electric furnace and induction furnace.Electromagnetic field has a certain effect on the service life of refractories and inclusion in steel.Therefore,it is of great significance to study the interaction between molten slag/steel and refractories under electromagnetic field.In this study,three types of MgO-based refractories,namely magnesium-aluminum spinel refractories,magnesium calcium refractories and magnesium carbon refractories were chosen,which are the most widely used in the ferrous metallurgy.The erosion tests were conducted at 1600? using three MgO based refractory crucibles which were added with basic slag of R=4 and GCr15SiMo steel,and they were carried out in resistance furnace(non-electromagnetic field),multi-factor slag furnace(electromagnetic field,vacuum,inert atmosphere N2)and intermediate frequency induction furnace(air atmosphere,electromagnetic field),respectively.The erosion and penetration depths of samples after test were measured,and the samples were characterized by SEM,EDS and XRD.The main conclusions are as follows:(1)The erosion's degree of MgO-based refractories by molten slag is related to electromagnetic field.The order is as follows:electromagnetic field in open system>vacuum electromagnetic field>non-electromagnetic field.(2)The effect of erosion and penetration on resistance to slag of magnesium carbon refractories is superior to magnesium-aluminum spinel refractories and magnesium calcium refractories among three types of MgO-based refractories.(3)The non-metallic inclusions in molten steel are the least under the vacuum electromagnetic field when MgO-based refractories were chosen. |
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