The calcium treatment process influences the molten steel's cleanliness,the equilibrium phase diagram was used for comparison analysis of impurities'type and content,which is generated with the different calcium content,results show that the density of oxides impurities decreased from 0.52 PCs/mm2 to 0.4 PCs/mm2 when the calcium content is 1×10-6 along with the increasing of calcium content in steel;the density of the large size impurities in steel goes up first and then goes down,when calcium content is 1× 10-6,it decreased from 0.005 PCs/mm2 to 0.004 PCs/mm2;and the soluble calcium content in steel is(3～4)× 10-6 along with the increasing of the oxygen content in steel,the soluble calcium content has not much changed,and the activity of calcium is inhibited significantly.
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