A micro segregation model of solute elements in the mushy zone in continuously cast bloom of bearing steel GCrl5 is established in consideration of δ/γ phase transformation

which is applied in the solidification heat transfer of 220 mm x 260 mm continuous casting bloom. The results show that accurate solidus and liquidus temperature and relationship between temperature and solid fraction during the solidification process of high carbon steel can been acquired by the model only y phase precipitates out from liquid steel directly during the solidification process of bearing steel GCrl5 ；the segregation ratio of S

P and C is bigger at the final solidification stage

as solid fraction increases

the effect of cooling rate on segregation is more remaritable

the content of S

P and cooling rate have a bigger effect on ZDT. After the continuous casting process parameters optimized based on the solidification heat transfer model

the center carbon segregation ratio is 0.96 to 1. 05 and the internal cracks don't appear.