摘要
良好的凝固末端轻压下工艺可以有效地改善连铸坯的中心偏析和中心疏松,压下位置的确定是其关键技术之一。为了得到最佳的压下位置和压下量,首先建立了42MH钢凝固传热模型,计算得出铸坯溶质元素C、Si、Mn元素偏析量和钢水粘度与固相率fs的关系,分析得出最佳压下区间为fs=0.60~0.95;其次计算出不同的工艺参数对压下位置的影响,并拟合出相应的线性关系式;最后根据压下位置的选择原则和对铸坯凝固收缩率的计算,在铸机9#扇形段和10#扇形段分别压下2.9、2.8 mm后铸坯并未出现额外裂纹。
A good soft reduction process at the end of solidification can effectively improve the center segregation and center looseness of continuous casting billet. The determination of reduction position is one of the key technologies. In order to get the best reduction position and reduction amount, the heat transfer model of at first, a 42 MH steel solidification was established, and the relationships between segregation of C, Si, Mn and viscosity of molten steel and solid phase ratio fswere calculated. It is concluded that the optimum reduction interval is fs=0.60-0.95. Next, the influence of different process parameters on the reduction location was calculated, and the corresponding linear relationship was fitted. Finally, according to the selection principle of the reduction location and the calculation of the solidification shrinkage of the slab, there is no additional crack in the cast slab after reduction amount of 2.9 mm and 2.8 mm, respectively, for the 9#segment and the 10#segment of the casting machine.
作者
王少伟
陈艳
李岢
李向阳
WANG Shaowei;CHEN Yan;LI Ke;LI Xiangyang(School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan 243002,China)
出处
《热加工工艺》
北大核心
2021年第3期95-99,共5页
Hot Working Technology
关键词
中碳钢
固相率
压下位置
压下量
工艺参数
medium carbon steel
solid phase rate
reduction position location
reduction amount
process parameters
