在CCT-AY-Ⅱ型钢板连续退火模拟机上研究了720~820℃不同退火温度下保温100 s对试验钢(0.16C-0.13Si-2.51Mn)组织性能的影响。用膨胀仪测定了试验钢的相变点,绘制了不同冷速下的CCT曲线,利用OM和SEM等方法观察了试验钢的组织结构,通过拉伸试验机测定了退火钢板的单轴拉伸性能。结果表明,试验钢的临界冷速为20℃/s左右,有较好的淬透性。抗拉强度随退火温度升高先升高后略微降低;屈服强度不断升高,变化趋势逐渐变慢;伸长率先升高后降低。在780℃退火后,试验钢获得最佳力学性能,其抗拉强度为1101 MPa,伸长率15%,显微组织为铁素体+回火马氏体。 The effect of heat-holding time of 100 s at different annealing temperature (720 ~ 820 ℃) ​​on the microstructure and properties of the test steel (0.16C-0.13Si-2.51Mn) was studied on CCT-AY-Ⅱ steel continuous annealing simulator. The phase transition point of the test steel was measured with a dilatometer, the CCT curves were drawn under different cooling rates, the structure of the test steel was observed by means of OM and SEM, and the uniaxial tension of the annealed steel was measured by a tensile tester performance. The results show that the critical cooling rate of the test steel is about 20 ℃ / s, and has good hardenability. Tensile strength first increased slightly and then decreased slightly with the increase of annealing temperature; yield strength increased continuously and the change trend gradually became slower; elongation increased first and then decreased. After annealing at 780 ℃, the test steel obtained the best mechanical properties, the tensile strength of 1101 MPa, elongation of 15%, the microstructure of ferrite + tempered martensite.