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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_c)and carbon equivalent(CEL)was investigated.The results show that T_c(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).
CE (=% C + (1/3) x (% Si)) does not suit experiment results in many cases. This work, the effect of al- loy elements on primary crystal temperature was measured and the relationship between primary crystal temperature ( (CEL) was investigated. The results show that T_c (Celsius de gree) = 1650-110 × (% C) -25 × (% Si) +3 × (% Mn) -35 × P% -71 ×% S-2 ×% Ni -7 ×% CEL =% C + 0.23 ×% Si -0.03 ×% Mn + 0.32 ×% P + (% 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).