齿轮钢20CrMnTiH连铸大圆坯宏观偏析控制  

Macro segregation control of gear steel 20CrMnTiH continuous casting large round bloom

作　　者：范斌 刘利 张思远 李浩秋 刘晓明 王强 FAN Bin;LIU Li;ZHANG Siyuan;LI Haoqiu;LIU Xiaoming;WANG Qiang(Special Steel Division of Laiwu Branch of Shangang Co.,Ltd.,Jinan 271105,Shandong,China;Key Laboratory of EPM,Northeast University,Shenyang 110819,Liaoning,China;State Key Laboratory of Rolling and Automation,Northeast University,Shenyang 110819,Liaoning,China)

机构地区：[1]山钢股份莱芜分公司特钢事业部,山东济南271105 [2]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819 [3]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《连铸》2023年第4期23-28,共6页Continuous Casting

基　　金：国家自然科学基金资助项目(U21A20117);辽宁省自然科学基金资助项目(2022-MS-365)。

摘　　要：针对直径为Φ650 mm的20CrMnTiH齿轮钢大圆坯质量不稳定问题,通过对比结晶器电磁搅拌、二冷比水量等参数,取样分析连铸工艺参数对铸坯低倍组织、碳偏析量的影响。结果表明,结晶器电磁搅拌强度200 A/1.5 Hz、二冷比水量37/26(0.101 L/kg)条件下的铸坯中心等轴晶率较高,且碳元素分布更均匀,碳极差为0.01%,因此,采用该参数可以保持较高的齿轮钢20CrMnTiH的铸坯中心等轴晶率并降低宏观偏析波动的情况。In view of the unstable quality of 20CrMnTiH gear steel large round bloom with diameter ofø650 mm,the effects of continuous casting process parameters on the macrostructure and carbon segregation of the round bloom were analyzed by comparing the electromagnetic stirring of the mold and the specific water flowrate of the secondary cooling.The results show that under the conditions of 200 A/1.5 Hz of electromagnetic stirring in the mold and 37/26(0.101 L/kg)of specific water flowrate of the secondary cooling,the center equiaxed crystal ratio of the casting bloom is higher,and the carbon element distribution is more uniform,and the maximum carbon difference is 0.01%.Therefore,the adoption of this parameter can keep the center equiaxed crystal ratio of the round bloom for gear steel 20CrMnTiH and decrease the macro segregation fluctuation.

关 键 词：齿轮钢 结晶器电磁搅拌 二冷比水量 连铸 碳极差 宏观偏析 

分 类 号：TG142.1[一般工业技术—材料科学与工程]