高拉速下37Mn5钢连铸圆坯内部质量控制研究

炼钢 ›› 2017, Vol. 33 ›› Issue (4): 39-45.

高拉速下37Mn5钢连铸圆坯内部质量控制研究

（北京科技大学钢铁冶金新技术国家重点实验室，北京 100083）

接受日期:1900-01-01 出版日期:2017-08-05

Research on internal quality control of 37Mn5 steel round billet with high casting speed

Accepted:1900-01-01 Online:2017-08-05

摘要/Abstract

摘要： 针对Φ200 mm 37Mn5钢圆坯高拉速下铸坯存在的内部裂纹、中心缩孔与中心疏松等缺陷，结合生产实际分析得出过热度高、结晶器电磁搅拌强度偏小、二冷工艺及喷嘴布置不合适是引起铸坯质量问题的主要原因。通过建立经射钉及测温试验验证的凝固传热模型与采用高斯计测量电磁搅拌磁场的分布特征分别对二冷工艺制度和结晶器电磁搅拌参数进行优化，同时对二冷区喷嘴布置进行改进。结果表明：对于Φ200 mm 断面37Mn5钢连铸拉速从1.4 m/min提高到1.8 m/min，铸坯内部质量明显改善，内部裂纹消失，中心缩孔和中心疏松均为0.5级，若过热度大于30 ℃，仍存在比较严重的中心缩孔。

关键词: 37Mn5钢, 圆坯, 高拉速, 内部质量

Abstract: According to quality defects such as internal crack,center shrinkage and center porosity of 37Mn5 steel round billet with high casting speed,the main reasons which lead to internal quality defects were high superheat,weak mold electromagnetic stirring intensity,unreasonable secondary cooling process system and arranging form of nozzles respectively based on analysis of production practice.Mathematical model of solidification and heat transfer verified by nailshooting experiments and surface temperature testing was applied in optimizing secondary cooling process system.Stirring parameters were optimized by measuring the electromagnetic field distribution with Gauss meter in the mold at different stirring parameters,in addition arranging form of nozzles in second cooling zone was also improved.The results showed that Φ200 mm 37Mn5 steel round billet casting speed increased from 1.4 m/min to 1.8 m/min,the internal quality significantly has been improved.Internal cracks disappeared and the average grade of center shrinkage and center porosity was 0.5 ,but when superheat was greater than 30 ℃，center porosity still existed.

Key words: 37Mn5 steel, round billet, high casting speed, internal quality

安航航，包燕平，王敏，王睿. 高拉速下37Mn5钢连铸圆坯内部质量控制研究[J]. 炼钢, 2017, 33(4): 39-45.

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