Influence of Basicity on Crystallization Temperature and Crystalline Phase of Mould Powder

Based on chemical compositions and metallurgical properties of mould powder for hypoperitectic steel,the crystallization temperature and crystalline phase of experimental flux film in different basicity under laboratory conditions were observed by the method of process mineralogy. The results showed that with basicity (0.9~1.3) increasing,crystallization temperature increased,the heat flux initially decreased then increased and decreased again,the corresponding crystallization rate of flux films present increasing then decreasing and increasing. Meanwhile,the crystallization rate of flux films was very high,reaching to more than 75%. The crystalline minerals of flux films at different basicity were the same,mainly cuspidine and wollastonite. With the increase of basicity,cuspidine content continued to increase while wollastonite content gradually decreased. These results are expected to provide valuable reference on optimizing mould powder for hypoperitectic steel.