This segregation behavior of sn accords with the mechanism of non - equilibrium segregation . it can be obtained through the theoretical calculations that the critical time of sn non - equilibrium segregation is 124 seconds at 750 and the critical cooling rate is 8 / s when cooling from 1320 . it is suggested that controlling the cooling rate during continuous casting to avoid the critical cooling rate ( 8 / s ) and avoiding high stress near the trough temperature ( 750 ) may control the form 通过研究残留元素sn的偏聚机制及其对o . 15wt . % c钢热塑性的影响,对试验钢进行脆性预测:建议在该钢的连铸过程中弯道矫直温度尽量避开塑性谷底温度750 ,二冷区的冷速尽量避开临界冷却速率8 / s ,从而可以减少该低碳钢连铸坯表面裂纹和横向裂纹,提高其成材率。