使用Ｇｌｅｅｂｌｅ机测定了不同残余元素含量的连铸圆坯试样的高温力学性能，结果表明：Ｃｕ当量（Ｃｕ＋１０Ｓｎ）＝０．３２％的试样在９２５～１０００℃，特别是在９５０℃的热塑性显著降低；扫描电镜和俄歇检验发现，此温度下试样为沿晶断裂，在奥氏体晶界有Ｓｎ偏析。分析连铸生产条件认为，如拉速较低，结晶器内初生坯壳温度处于此高温脆性区，圆铸坯将可能产生纵裂。 The mechanical properties at high temperature of continuous casting billets with different residual elements contents were measured by Gleeble machine. The results showed that the tensile strength of the sample with Cu equivalent (Cu + 10Sn) = 0.32% was in the range of 925 ~ 1000 ℃, especially at 950 ℃ Significantly reduced; SEM and Auger test found that the sample at this temperature is intergranular fracture, segregation of Sn in the austenite grain boundaries. Analysis of continuous casting production conditions that, such as pulling rate is low, the temperature inside the mold primary shell in this high temperature brittle zone, the round billet may have longitudinal cracks.