齿轮钢20CrMnTiH淬透性/宏观偏析控制  

Gear steel 20CrMnTiH hardenability/macro segregation control

作　　者：范斌 刘利 张时雨 刘宁宁 刘晓明 王强 FAN Bin;LIU Li;ZHANG Shi-yu;LIU Ning-ning;LIU Xiao-ming;WANG Qiang(Special Steel Division,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1期47-54,共8页Continuous Casting

摘　　要：针对近期?500 mm断面20CrMnTiH淬透性波动幅度较大问题,通过改变拉速、结晶器电磁搅拌、二冷比水量等参数,对比取样分析改变参数前后的低倍组织、碳偏析量以及淬透性。结果表明,采用改变后的生产参数进行生产,等轴晶率下降幅度较小,宏观偏析以及淬透性波动幅度明显下降,产品质量提升明显。生产参数调整对比中150 A、1.5 Hz结晶器电磁搅拌参数下的宏观偏析和淬透性波动情况明显好于200 A、1.5 Hz结晶器电磁搅拌参数情况。因此,采用拉速0.35 m/min、二冷区各分段水量为40 L/min、21 L/min、13 L/min,二冷比水量0.134 L/kg、结晶器电磁搅拌150 A、1.5 Hz以及末端电搅100 A、7 Hz参数,改善了齿轮钢20CrMnTiH淬透性/宏观偏析波动大的情况。Aiming at the large fluctuation of 20CrMnTiH hardenability of?500 mm section recently,by changing the parameters such as pulling speed,mold electromagnetic stirring,and secondary cooling specific water,the low magnification structure,carbon segregation amount and hardenability before and after changing parameters were compared and analyzed.The results show that when the changed production parameters are used for production,the equiaxed crystal rate decreases slightly,the macro-segregation and hardenability fluctuations decrease significantly,and the product quality improves significantly.In the adjustment and comparison of production parameters,the macro-segregation and hardenability fluctuations under the electromagnetic stirring parameters of the 150 A and 1.5 Hz molds are significantly better than those under the electromagnetic stirring parameters of the 200 A and 1.5 Hz molds.Therefore,the pulling speed is 0.35 m/min,and the water volume of each section in the secondary cooling zone is 40 L/min,21 L/min,and 13 L/min,0.134 L/kg specific water volume of the secondary cooling zone,150 A、1.5 Hz electromagnetic stirring in the crystallizer and 100 A、7 Hz electric stirring at the end,the high hardenability/macro segregation fluctuation of 20CrMnTiH gear steel is improved.

关 键 词：齿轮钢 淬透性 碳含量 宏观偏析 结晶器电磁搅拌 

分 类 号：TG142.1[一般工业技术—材料科学与工程]