Abstract: The production flowsheet of 240 mm slab of tested steel 1500MS (/% : 0.20C, 0.31Si, 1.39Mn, 0.011P, 0.001S, 0.028Als, 0.26Cr, 0.028Ti, 0.0018B, 0.0048N) is 250t BOF-LF-RH-slab CC process. The mechanical properties of tested steel at 1350 ~600°C have been measured by using Gleeble-1500 thermal simulation machine to get I-bnttle zone at 1350 ~ 1250°C , and Ⅲ-brittle zone at 650〜750°C，and at 800〜1200 °C the tested steel has better hot plasticity ； and the mathematical model of slab solidification heat transfer is established and the surface temperature of casting slab in solidification process is calculated. The temperature of tested steel of steel 1500MS at straightening zone should be controlled at 800〜1150°C.

Key words: High Strength Cold-Rolled Steel 1500MS for Auto, 240mm Slab Casting, Mechanical Properties of Steel at High Temperature

摘要： 试验用1500MS钢（/%:0.20C,0.31Si,1.39Mn,0.011P,0.001S,0.028Als,0.26Cr,0.028Ti,0.0018B,0.0048N）240mm板坯的生产流程为250t BOF-LF-RH-板坯连铸。通过Gleeble-1500热模拟试验机,测试了试验钢1350~600℃的力学性能,得出该钢第Ⅰ脆性区为1350~1250℃,第Ⅲ脆性区为650~750℃在800~1200℃铸坯具有良好的热塑性;建立了板坯凝固传热数学模型和计算了铸坯凝固过程的表面温度。1500MS钢铸坯矫直区域的温度应控制在800~1150℃。

关键词: 高强度冷轧汽车用钢1500MS, 240mm连铸板坯, 高温力学性能