Analysis of surface cracks and optimization of mold flux for advanced plastic mold steel slab
Aiming at the surface crack defects of advanced plastic mold steel during the continuous casting process,sampling analysis was conducted on the surface cracks of the casting slab,and it was determined that they were caused by the performance of the mold flux.Orthogonal experiments were used to design different base material for-mulas to design a mold flux plan.The composition,melting point,melting rate,viscosity,and crystallization char-acteristics of the mold flux were analyzed.The hemispherical temperature range of the mold flux in the design plan was 1 030-1 179 ℃,and the viscosity was 0.085-0.127 Pa·s.After optimization,the alkalinity of the mold flux is slightly reduced,the crystallization temperature and solidification temperature are reduced,and lubrication is in-creased.The melting point and viscosity of the mold flux are reduced,and the melting effect is improved through mineral phase analysis of the mold flux,it can be seen from the crystal diagram that the optimized mold flux uniform crystal size,mainly composed of feldspar like crystals,and a small amount of glass body exists,which can improve the heat transfer and lubrication effect of the mold flux.By optimizing the performance of the mold flux,the surface crack defects of the casting slab were effectively controlled,reducing from 10％to below 0.2％.
medium plateplastic mold steelcasting slabsurface cracksmold fluxcrystallization mineral
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