利用Gleeble-1500热模拟实验机测试了SCM435钢连铸坯的高温塑性,并通过金相、扫描电镜等方法对拉断后试样的断口及组织形貌进行了观察分析。结果表明:SCM435钢在1 000～1 260℃时,其断面收缩率大于60%,具有良好的塑性。材料存在两个脆性温度区域,收缩率均小于60%脆性温度范围为1 260℃至熔点区间和750～1 000℃区间,从而在制定连铸和热轧工艺制度时可避开该温度区,或尽量在该区域少停留。 The high temperature plasticity of SCM435 steel continuous casting billet was tested by Gleeble-1500 thermal simulation machine. The fracture and microstructure were observed and analyzed by metallographic and scanning electron microscope. The results show that: the SCM435 steel at 1000 ~ 1 260 ℃, the reduction of area of ​​more than 60%, has good ductility. The material has two brittle temperature zones with shrinkage of less than 60%. The brittle temperature range is from 1 260 ℃ to the melting point and from 750 to 1 000 ℃. Therefore, the temperature zone can be avoided during the process of making continuous casting and hot rolling processes. Or try to stay in the area for less.