The solidification heat transfer model of 250 mm×250 mm bearing steel square billet was established,and the accuracy of the model was verified according to the solidification square root law.The influence of drawing speed and super-heat on solidification end point is discussed,and a new pressing system is developed.Industrial tests were carried out with different pressure systems,and the test results showed that:the optimized reduction system basically eliminates the center shrinkage hole of the square billet,reduces the center segregation ratio from 1.1 to 1.0,reduces the maximum carbon con-tent on the V-shaped segregation line from 1.391%to 1.184%,and reduces the average carbon content range between the V-shaped segregation line and the non-segregation line from 0.113%to 0.07%.
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