Measurement of Solidified Shell of 240 mm x 240 mm Casting Bloom by Nail-Shooting Technique and Process Optimization

秦凤婷; 刘宗辉; 董战利

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Measurement of Solidified Shell of 240 mm x 240 mm Casting Bloom by Nail-Shooting Technique and Process Optimization

更新时间：2026-01-21

- Measurement of Solidified Shell of 240 mm x 240 mm Casting Bloom by Nail-Shooting Technique and Process Optimization
- Special Steel Vol. 41, Issue 1, Pages: 51-54(2020)
- 作者机构：
  
  1. 济源职业技术学院冶金化工系,济源,459000
  2. 东北大学冶金学院,沈阳,110819
  3. 河南济源钢铁(集团)有限公司炼钢厂，),济源,459000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：29 August 2019，
  
  Online First：20 April 2022，
  
  Published：20 April 2020
- 稿件说明：
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秦凤婷, 刘宗辉, 董战利. Measurement of Solidified Shell of 240 mm x 240 mm Casting Bloom by Nail-Shooting Technique and Process Optimization[J]. Special Steel, 2020, 41(1): 51-54.
DOI：

秦凤婷, 刘宗辉, 董战利. Measurement of Solidified Shell of 240 mm x 240 mm Casting Bloom by Nail-Shooting Technique and Process Optimization[J]. Special Steel, 2020, 41(1): 51-54. DOI：

摘要

利用射钉法测定了连铸机生产240mm×240mm断面35CrMoA、20CrMoA、GCr15、60Si2MnA四个钢种的铸坯凝固坯壳厚度

并根据凝固定律计算了其液相穴长度和综合凝固系数;针对240mm×240mm方坯选择固相率0.70、0.75进行计算得出F-EMS在不同拉速条件下的电磁搅拌位置

分析了工艺参数对连铸机凝固系数的影响

提出的工艺优化措施为:改变电磁搅拌位置

F-EMS位置修正为根据高碳钢GCr15、60Si2MnA来安装

35CrMoA

20CrMoA

GCr15和60Si2MnA四钢种拉速值分别调整为0.80、0.81、0.78、0.80 m/min。工艺优化后铸坯质量得到明显改善

中心偏析级别≤0.5合格率由原来≤40%提高到100%

中心疏松级别≤1.5合格率由原来≤50%提高到≥90%。

Abstract

Nail-shooting technique is applied to measure shell thickness of 240 mm x 240 mm bloom of steel 35CrMoA

20CrMoA

GCrl5 and 60Si2MnA produced by the continuous caster. Length of the liquid core and solidification coefficient are calculated by using the solidification law. The electromagnetic stirring position of F-EMS at different drawing speeds is calculated by the solid phase ratio of 0. 70 and 0. 75 for the 240 mm x 240 mm bloom. The relationship between solidification coefficient of continuous casting machine and each process parameter is analyzed. The process optimization measures are： changing the electric stirring position

and modifying the F-EMS position to install according to high carbon steel GCrl5 and 60Si2MnA

and adjusting the casting speed value of four steel of 35CrMoA

20CrMoA

GCrl5 and 60Si2MnA to 0. 80

0. 81

0. 78 and 0. 80 m/min. The quality of billet is improved greatly after the process improvement

i. e. qualified ratio of center segregation rating ≤0.5 increases from original ≤40% to 100% and that of center porosity rating ≤1.5 increases from original ≤50% to ≥90%.

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