关键词: 低碳钢150 ~ 180 mm连铸板坯, 角部纵裂纹, 结晶器, 有限元模型, 锥度优化

Abstract: During production of 150 ~ 180 mm casting slab of SS400, D36 and X70 steel with casting speed 0. 95 m/min by 1^# caster at steelworks the longitudinal crack at comer of slab easily occurs and the max occurrence rate of crack is up to 5%. The solidification and heat transfer model of two-dimensional slice type of slab casting mold has been established by using commercial finite element software ANSYS and the calculation of solidification and heat transfer in mold during casting process has been carried out by using heat transfer and stress/strain direct-coupling method to analyze the distribution of temperature in slab with casting rate 0. 95 ~ 1. 05 m/min of each steel and the thermal stress introduced by uneven temperature distribution. Commercial test results show that based on the calculation results, it is available to eliminate the longitudinal crack at comer of slab casting by 1^# caster by improving the slab mold narrow face taper coefficient from original 1.00% to 1. 10%.

Key words: Low Carbon Steels, 150 ~ 180 mm Casting Slab, Longitudinal Crack at Comer, Mold, Finite Element Model, Taper Optimization