炼钢

• 凝固与浇铸 • 上一篇    下一篇

轻压下对C610L连铸板坯内部品质的改善

林大帅,李晓斐,张文涛,李艳峰,王景宁,刘剑锋   

  1. (河钢集团承钢公司板带事业部,河北承德067000)
  • 接受日期:1900-01-01 出版日期:2019-10-05

Improving internal quality of C610L continuous casting slab with soft reduction

  • Accepted:1900-01-01 Online:2019-10-05

摘要: 为解决C610L连铸板坯生产过程中出现的中心质量问题,建立了二维非稳态传热数学模型对200mm×1500mm连铸板坯凝固传热温度场进行模拟计算,计算结果显示铸坯凝固温度场较合理,凝固终点位置在距结晶器弯月面17.54m处。采用射钉试验对模型计算的准确性进行验证,试验表明模拟计算结果可用于指导轻压下工艺的制定。对铸坯中心固相率在0.3~0.7,对应扇形段6~7段内实施压下,制定总压下量为4mm。低倍检验结果表明压下方案的实施对铸坯中心质量改善效果明显,在后续生产中铸坯在线缺陷率从3.34%下降到0.89%。

关键词: 连铸板坯, 数值模拟, 轻压下, 中心疏松

Abstract: In order to solve the central quality problems in the continuous casting production process of C610L slab,a two-dimensional solidification and transient heat transfermathematical model of 200mm×1500mm continuous casting slabfor simulated solidification heat transfer process was established.The solidification temperature field was reasonable displayed by calculated results andthe end point of solidification was 17.54m from the meniscus of the mould. Accuracy of the modelwas verified through the nail-shooting experimentsand the calculation results could guide the formulation of soft reduction.4millimeter reductions was applied in the final stage of solidification where central solid fraction ranged from 0.3 to 0.7 corresponding sector 6~7. According to macroscopic examination results,remarkable resultswasachieved from reduction programin improving center quality,and pushed the online defect rate from 3.34% down to 0.89%.

Key words: continuous casting slab, numerical simulation, soft reduction, center porosity