改善55SiCrA弹簧钢小方坯内部质量的试验研究

›› 2016, Vol. 32 ›› Issue (3): 41-45.

改善55SiCrA弹簧钢小方坯内部质量的试验研究

李朋欢¹,包燕平²,安航航³,王林静²,彭尊²

1. 杭州钢铁集团公司
2. 北京科技大学钢铁冶金新技术国家重点实验室
3. 北京科技大学

收稿日期:2015-12-28 修回日期:2016-02-18 接受日期:1900-01-01 出版日期:2016-06-05 发布日期:2016-06-15
通讯作者: 安航航 E-mail:anhang333@163.com

Experimental research on improving internal quality of 55CrSiA spring steel billet

1. Hangzhou Iron & Steel Group Company
2.
3. University of Science & Technology Beijing

Received:2015-12-28 Revised:2016-02-18 Accepted:1900-01-01 Online:2016-06-05 Published:2016-06-15

摘要/Abstract

摘要： 针对某厂55SiCrA弹簧钢小方坯连铸坯存在的中心等轴晶率低，比较严重的中心碳偏析、中心疏松和缩孔等内部质量问题，系统研究了不同电磁搅拌工艺参数对断面150mm×150mm结晶器内磁场特性的影响，并通过工业试验研究了结晶器电磁搅拌（M-MES）电流和频率对宏观凝固组织和铸坯碳偏析的影响。研究结果表明：结晶器电磁搅拌（M-MES）电流增大，中心等轴晶率提高，铸坯中心碳偏析减小；搅拌频率对等轴晶率和铸坯中心碳偏析的影响呈非线性；优化最佳匹配的电磁搅拌电流和频率分别为320A 和3.5Hz时，中心等轴晶率从18.5%增加到32.5%，中心碳偏析指数从1.23降低到1.04，消除了中心缩孔和角部裂纹，铸坯内部质量有明显的改善。

关键词: 结晶器电磁搅拌, 55SiCrA弹簧钢, 磁场特性, 内部质量

Abstract: In view of the lower center equiaxed crystal ratio, more serious central carbon segregation, central porosity and shrinkage defected that affected internal quality of 55SiCrA spring steel billet, influence of M-EMS process parameters on magnetic field distribution characteristics was systematically studied in 150mm×150mm billet mould. Moreover, research of the effect of stirring electric current and frequency of mould electromagnetic stirrer（M-MES） on macro solidified structure and central carbon segregation was also carried out by industrial experiments. The experimental results proved that with stirring electric current of M-EMS increasing, central carbon segregation index decreased and center equiaxed crystal ratio rised. There was a non-linear relationship between stirring frequency of mould electromagnetic stirrer（M-MES）and center equiaxed crystal ratio besides central carbon segregation. Center equiaxed crystal ratio increased from 18.5% to 32.5%, central carbon segregation index decreased from 1.23 to 1.04 and the central porosity and corner cracks were eliminated when stirring electric current was 320A and frequency was 3.5Hz. Finally billet internal quality was evidently improved.improved.

Key words: mould electromagnetic stirring, 55SiCrA spring steel, magnetic field characteristics, internal quality

李朋欢包燕平安航航王林静彭尊. 改善55SiCrA弹簧钢小方坯内部质量的试验研究[J]. , 2016, 32(3): 41-45.

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