利用Gleeble3500热模拟试验机对热轧搪瓷钢试样进行不同温度下的高温拉伸试验,得到其高温下力学性能随温度变化规律。再使用光学显微镜及扫描电子显微镜对不同温度下的拉伸断口的形貌及组织进行观察与分析,同时使用高温金相显微镜对热轧搪瓷钢在经历高温烧搪过程中组织的变化进行观察。结果表明,试验钢屈服强度、抗拉强度都随着温度升高而降低,断面收缩率随温度升高而增加,表现出极好的高温塑性。高温拉伸试样断口搪烧高温下未出现严重的高温脆化现象,保持有良好的延展性。在推荐的搪烧温度850℃下,试验钢晶粒较常温晶粒略微长大,组织上变化不大,不会出现其力学性能的过大变化。 Hot-rolled enamel steel samples were subjected to high-temperature tensile test at different temperatures by using Gleeble3500 thermal simulation tester to obtain the change law of mechanical properties with temperature at high temperature. The morphology and microstructure of the tensile fracture at different temperatures were observed and analyzed by optical microscope and scanning electron microscope. The microstructure of hot-rolled enamel steel was also observed by high temperature metallurgical microscope. The results show that both the yield strength and the tensile strength of the test steel decrease with the increase of temperature, and the reduction of area decreases with the increase of temperature, showing excellent high temperature ductility. High-temperature tensile specimen rupture at high temperature does not appear serious high-temperature embrittlement, maintain a good ductility. At the recommended sintering temperature of 850 ℃, the grain size of test steel slightly grows up at room temperature compared with that at room temperature. There is no obvious change in the microstructure and the excessive change of mechanical properties will not occur.