Liquid steel flow and heat transfer-solidification process were simulated and analyzed by CFX4 4 software

and relation between relative process parameters and immersed nozzle structure has been discussed in order to decrease carbon segregation of 300 mm X 300 mm cast bloom of bearing steel. Production practice showed that a immersed nozzle with 4 holes was used instead of original one with straight hole

the center carbon segregation rating of cast bloom decreased from 1. 0 ~ 2. 0 to 1. 0 ~ 1. 5

and the percentage of ≤1. 0 rating of bloom with using 4 holes nozzle was 79% while that with using straight hole nozzle was only 50% .