ABSTRACT

Cooling uniformity has a great influence on slab solidification. To study its effect on the internal reduction efficiency, a thermo-mechanical coupling slab solidification model was studied and an internal reduction efficiency calculation model was established. Numerical simulation was performed with ProCAST software and verified by a pin shooting test. The results showed that under uniform cooling, when the reduction amount was more than 3 mm, the internal reduction efficiency was 38–41%, and under non-uniform cooling, the internal reduction efficiency for the 1/4 width and 1/8 width of the slab was 21–28%, while that for the 1/2 width was 45–47%. The soft reduction process parameters was optimized accordingly. Industrial trials showed that an increase in the reduction amount could decrease the central segregation for the 1/4 width of the slab, and the maximum central carbon segregation index was reduced from 1.29 to 1.18.

摘要

冷却均匀性对板坯凝固有很大影响。为研究其对内压下效率的影响，研究了热力耦合板坯凝固模型，建立了内压下效率计算模型。数值模拟是用 ProCAST 软件进行的，并通过射针测试进行验证。结果表明，均匀冷却下，压下量大于3 mm时，内压下效率为38%～41%，非均匀冷却下，1/4宽度和1/8宽度内压下效率为板的宽度为 21-28%，而 1/2 宽度的为 45-47%。相应地优化了轻压下工艺参数。工业试验表明，增加压下量可以减少板坯1/4宽度的中心偏析，