Study on Internal Quality Control of 20CrMnTiH Steel Strands
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摘要: 针对20CrMnTiH齿轮钢质量要求,分析了连铸过程拉速、结晶器电磁搅拌电流强度以及二冷强度等关键参数对铸坯内部质量的影响。试验结果表明:拉速控制在1.2~1.4 m/min有利于中心疏松和中心偏析的控制;结晶器电磁搅拌电流强度为380 A时,铸坯中心疏松控制在1.0级以内,碳偏析指数 ≤ 1.08,等辅晶率平均达到34.9%;二冷控制模式采用弱冷更有利于减轻该钢种的铸坯中心疏松和偏析。根据研究结果生产的20CrMnTiH齿轮钢棒材低倍组织和淬透性良好。
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关键词:
- 20CrMnTiH齿轮钢 /
- 拉速 /
- 电磁搅拌 /
- 二冷强度
Abstract: According to the requirements of 20CrMnTiH steel,effects of key parameters including casting peed,the mould's current intensity for electromagnetic stirring(EMS) and intensity of secondary cooling on internal quality of strands were studied.The results show that controlling the casting speed at 1.2~1.4 m/min is beneficial to the control of 20CrMnTiH strands' internal quality,and with current intensity for EMS of 380 A,the level of center porosity can be controlled within 1.0 and the index of carbon segregation not more than 1.08,and the equiaxed crystal ratio reaches 34.9%.Furthermore,center porosity and segregation can also be improved when weak secondary cooling is adopted.Based on these research findings,20CrMnTiH steel bars produced show good macrostructure and hardenability. -
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