Relationship between Primary Crystal Temperature and Carbon Equivalent in Cast Iron

CE(=%C+（1/3）x（%Si）) does not suit experiment results in many cases.In this work,the effect of al- loy elements on primary crystal temperature was measured and the relationship between primary crystal temperature（T;）and carbon equivalent（CEL）was investigated.The results show that T;（Celsius de- gree）=1650-110×（%C）-25×（%Si）+3×（%Mn）-35×（%P）-71×（%S）-2×（%Ni）-7×（%Cr）;CEL=%C+ 0.23×（%Si）-0.03×（%Mn）+0.32×（%P）+0.64×（%S）+0.02×（%Ni）+0.06×（%Cr）.That is,in hypo eutectic composition,carbon equivalent should be calculated with CEL=%C+0.23×（%Si）,not with CE=%C+（1/3）×（%Si）.