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| Optimization of mold flux to improve surface quality of ultra-low carbon IF steel |
| LUO Yan-zhao，JI Chen-xi，DENG Xiao-xuan，PAN Hong-wei，ZENG Zhi，CUI Yang |
| （Strip Technology Department， Shougang Research Institute of Technology， Beijing 100043， China） |
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Abstract By optimizing the chemical compositions of the mold flux， the melting point of the mold flux reduced from the 1 222 to 1 188 ℃， and the viscosity increased from 0.26 to 0.32 Pa·s. The conducted industrial experiments showed that >2 μm inclusions detected by ASPEX scanning on the edge， 1/4 width， 1/2 width and 1/2 thickness all decreased after the optimization of mold flux.The temporary surface blockade ratio reduced from 4.51% to 2.55%. To explain the improvement of steel slab cleanliness after apply the optimized mold flux， the variation of melting temperature and viscosity 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 1 259 and 1 203 ℃， 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 inclusions.
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Received: 19 August 2016
Published: 18 April 2017
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2017, Vol. 52 
