摘要
针对某钢厂Q355B板坯在拉速提高后连铸工艺参数不匹配的问题,利用ProCAST软件建立铸坯凝固传热模型,研究了不同连铸工艺参数下的铸坯凝固特征。研究结果表明,拉速对板坯凝固过程影响最大,比水量次之,过热度的影响最小。随着拉速增加、比水量降低、过热度的提高,除坯壳厚度降低以外,铸坯温度、凝固终点及两相区长度均呈不同程度的增加。在现场实际生产过程中发现,在不改变比水量和轻压下位置的情况下,改变铸坯拉速,三者之间未能有效配合,导致铸坯出现严重的中间裂纹。基于模拟结果,在拉速提高至1.0 m/min的情况下,将比水量由0.38 L/kg提高至0.55 L/kg,中间裂纹产生的概率从70%降低到了11%左右,铸坯中心偏析控制在C1.5级以上的比例提高了24.5%。
In order to solve the problem that the continuous casting parameters of Q355B slab in a steel plant do not match with each other when the casting speed is increased,ProCAST software was employed to establish the solidification heat transfer model of the slab,and the solidification characteristics of the slab under different continuous casting parameters were studied.The results show that the casting speed has the greatest influence on the slab solidification,followed by the specific water flow rate,and the smallest is superheat in the calculated range.With the increase of casting speed or the decrease of specific water rate or the increase of superheat,the slab temperature,the solidification end and the length of two-phase zone increase to different degrees except the shell thickness.In the actual production process,it is found that changing the casting speed billet production without changing the specific water volume and the position under light pressure,the three failed to effectively cooperate with each other,resulting in serious intermediate cracks.Based on simulation results,when the casting speed is increased to 1.0 m/min,the specific water flow rate is increased from 0.38 L/kg to 0.55 L/kg,as a result,the generation ratio of intermediate crack is reduced from 70%to about 11%,and the center segregation of slab above the level of C1.5 increases by 24.5%.
作者
周国涛
陈金
黄标彩
闫威
李晶
ZHOU Guo-tao;CHEN Jin;HUANG Biao-cai;YAN Wei;LI Jing(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Fujian Sangang Minguang Co.,Ltd.,Sanming 365000,Fujian,China)
出处
《连铸》
2023年第2期43-51,共9页
Continuous Casting
关键词
Q355B板坯
连铸
凝固传热
数值模拟
中间裂纹
Q355B slab
continuous casting
solidification and heat transfer
numerical simulation
intermediate crack
