Effect of F-EMS on inner quality of spring steel continuous casting billet
WANG Xing-yu1, HAN Yan-shen1, LIU Qing1, XIAO Dong2,CHEN Jun2, GUAN Min3
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. Technical Center, Xiangtan Iron and Steel Co., Ltd., of Hunan Valin, Xiangtan 411101, Hunan, China; 3. Technical Center, Jiangsu Boji Spraying Systems Co., Ltd., Yangzhou 225267, Jiangsu, China
Abstract:The 55SiCrA spring steel is prone to be affected by inner quality problems in continuous cast billets. Appropriate final electromagnetic stirring (F-EMS) can effectively improve the inner quality of the billets,however,the unreasonable stirring parameters fail to improve the inner quality of the continuous casting billets,or even deteriorate the inner quality. In order to improve the inner quality of the continuous casting billets and to obtain the optimal F-EMS scheme,the influence of F-EMS parameters was studied on the inner quality of 55SiCrA billet with a section size of 150 mm×150 mm. The solidification condition of the casting blank under the current process was analyzed by establishing a solidification and heat transfer model,and the position of F-EMS was determined to be 8.45-8.73 m away from the meniscus. On the basis of measuring the center magnetic induction intensity of the billets under F-EMS,the matching of current and frequency is studied,and the corresponding industrial tests are conducted. The results indicate that the comprehensive quality of the continuous casting billet is best when the F-EMS parameter is 300 A/8 Hz. For billets,the average center carbon segregation index reaches 1.007,the center pipe of the continuous casting blank is improved,and the central equiaxed crystal ratio is increased.
王兴宇, 韩延申, 刘青, 肖冬, 陈军, 管敏. 末端电磁搅拌对弹簧钢连铸坯内部质量的影响[J]. 钢铁, 2020, 55(5): 59-67.
WANG Xing-yu, HAN Yan-shen, LIU Qing, XIAO Dong,CHEN Jun, GUAN Min. Effect of F-EMS on inner quality of spring steel continuous casting billet. Iron and Steel, 2020, 55(5): 59-67.
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