Abstract: Based on the finite element method the distribution of thermo-mechanical plastic strain of high carbon steel (0. 73% ~0. 77%C) casting slab during soft reduction process has been simulated and calculated by using ANSYS software ,the effect of reduction in height- 2 mm + 2 mm, 3 mm + 3 mm and 2 mm + 2 mm + 2 mm at defined segments on plastic strain of reduction sector and location is analyzed and the simulated results are verified at casting worksite. The results show that the plastic strain simulated values coincide with the measured values ； during hot deforming process the equivalent strain at center of slab is max, that at surface flows, and the equivalent strain at 1/4 of slab thickness is min； with increasing the reduction in height and reduction rate the thermo-mechanical plastic strain increases, and the reduction mode with 3 mm +3 mm has better reduction effect. Pilot production results show that compared with soft reduction 1. 5 mm + 1.5 mm + 1.5 mm at three segments (6^# sector, 7^# sector and 8^# sector) before optimization, the slab center segregation and center porosity are respectively 2. 0 rating, with soft reduction 2. 2 mm +2. 3 mm at two segments (6^# sector and 7^# sector or 7^# sector and 8^# sector) after optimization, the slab center segregation and center porosity are respectively 0. 5 rating, it is obviously improving the quality of macrostructure of casting slab.

摘要： 基于有限元法,利用ANSYS软件模拟计算了高碳钢（0.73%~0.77%C）连铸板坯轻压下过程中热-机械塑性应变分布,分析了给定扇形段的压下量2 mm+2 mm,3 mm+3 mm和2 mm+2 mm+2 mm对压下区间和位置的塑性应变的影响,并通过现场试验对模拟结果进行了验证。结果表明,塑性应变模型模拟值与实测值吻合;热变形过程中,铸坯心部的等效应变最大,表面节点次之,1/4位置等效应变最小;热-机械塑性应变随着压下量和压下速率的增加而增加,3 mm+3 mm压下模式具有较好的压下效果。生产试验结果表明,采用2个扇形段（6^#和7^#或7^#和8^#）进行2.2 mm+2.3 mm轻压下铸坯较优化前3个扇形段（6^#,7^#和8^#）1.5 mm+1.5 mm+1.5 mm轻压下铸坯中心偏析2.0级和中心疏松2.0级提高中心偏析0.5级和中心疏松0.5级,显著改善了连铸板坯的低倍质量。

关键词: 高碳钢, 230 mm连铸板坯, 轻压下, 热-机械塑性应变, 冶金质量