轻压下参数对75Cr1高碳钢230mm连铸板坯冶金质量的影响  

Effect of Soft Reduction Parameters on Metallurgical Quality of 230 mm Casting Slab of High Carbon Steel 75Cr1

作　　者：黄华[1] 徐李军[1] 仇圣桃[1] 

机构地区：[1]钢铁研究总院连铸技术国家工程研究中心,北京100081

出　　处：《特殊钢》2016年第6期52-55,共4页Special Steel

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。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 soft- ware, 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 re- sults show that the plastic strain simulated values coincide with the measured values; during hot deforming process the e- quivalent 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 segrega- tion 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 rat- ing, it is obviously improving the quality of macrostructure of casting slab.

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 

分 类 号：TF777[冶金工程—钢铁冶金]