绿色矿冶

Numerical simulations of the temperature field of an slab of 960 high strength steel with a cross-section size of 230mm×1330mm have been carried out based on a solidification heat transfer model. The solidification heat transfer model was validated and optimized by nail shooting and surface temperature measurement experiments, and the effects of specific water flow, superheat and casting speed on the temperature field and solidification end of slabs were analyzed. When the specific water flow in the second cooling zone increases by 0.05L/kg, the solidification end position of the billet moves forward by about 0.376m; when the superheat increases by 10K, the solidification end position of the billet moves backward by about 0.82m; when the pulling speed increases by 0.1m/min, the solidification end position moves backward by about 2.15m. The solidification end position of the billet moves backward by about 2.15m. The solidification end position of the billet moves backward by about 2.15m. Finally, the reduction position and amount were adjusted, from 3 segments to 2 segments, the reduction position was changed from 9th,10th,11th segment to 11th,12th segment, and the reduction amounts of 11th,12th segment were changed to 2.5,2.0mm, respectively. After the process optimization, the center segregation and center porosity of the billet are obviously improved, and the rating results of the two are reduced from 2.0 to 1.5 before optimization.