Macro segregation control of gear steel 20CrMnTiH continuous casting large round bloom
FAN Bin1, LIU Li1, ZHANG Siyuan2,3, LI Haoqiu1, LIU Xiaoming2, WANG Qiang2
1. Special Steel Division of Laiwu Branch of Shangang Co., Ltd., Jinan 271105, Shandong,China; 2. Key Laboratory of EPM, Northeast University, Shenyang 110819, Liaoning,China; 3. State Key Laboratory of Rolling and Automation, Northeast University, Shenyang 110819, Liaoning,China
Abstract:In view of the unstable quality of 20CrMnTiH gear steel large round bloom with diameter of ø650 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.
范斌, 刘利, 张思远, 李浩秋, 刘晓明, 王强. 齿轮钢20CrMnTiH连铸大圆坯宏观偏析控制[J]. 连铸, 2023, 42(4): 23-28.
FAN Bin, LIU Li, ZHANG Siyuan, LI Haoqiu, LIU Xiaoming, WANG Qiang. Macro segregation control of gear steel 20CrMnTiH continuous casting large round bloom. CONTINUOUS CASTING, 2023, 42(4): 23-28.