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.
[1] 唐劲松. 轿车悬架簧用线材的市场需求与质量要求[J]. 宝钢技术,2006(6):9. (TANG Jin-song. Market demand and quality requirements for suspension spring wire rods[J]. Baosteel Technology,2006(6):9.) [2] 刘青,张建峰,张晓峰,等. 合金弹簧钢连铸坯高温力学性能分析[J]. 重庆大学学报,2013,36(5):44.(LIU Qing,ZHANG Jian-feng,ZHANG Xiao-feng,et al. Analysis on high temperature mechanical properties of alloy spring steel billet[J]. Journal of Chongqing University,2013,36(5):44.) [3] 龚伟,庞昇,胡浩. 汽车用弹簧钢及其生产技术的发展[J]. 世界金属导报,2017-06-06(B14). (GONG Wei,PANG Sheng,HU Hao. Development of spring steel for automobile and its production technology[J]. World Metals,2017-06-06(B14).) [4] 李朋欢,包燕平,安航航,等. 改善55SiCrA弹簧钢小方坯内部质量的试验研究[J]. 炼钢,2016,32(3):41.(LI Huan-peng,BAO Yan-ping,AN Hang-hang,et al. Experimental research on improving internal quality of 55CrSiA spring steel billet[J]. Steelmaking,2016,32(3):41.) [5] 陈亮,宋波,陈天明,等. 320 mm×410 mm大方坯连铸重轨钢质量改进与应用[J]. 钢铁,2017,52(4):31. (CHEN Liang,SONG Bo,CHEN Tian-ming,et al. Improvement of quality of 320 mm×410 mm bloom in continuous casting of railway steel and its application[J]. Iron and Steel,2017,52(4):31.) [6] Choudhary S K,Ganguly S,Sengupta A,et al. Solidification morphology and segregation in continuously cast steel slab[J]. Journal of Materials Processing Technology,2017,243:312. [7] 王波,陈列,张旭,等. 特殊钢连铸大方坯末端电磁搅拌位置研究与应用[J]. 连铸,2016,41(5):17. (WANG Bo,CHEN Lie,ZHANG Xu,et al. Study and application of the F-EMS position for the special steel bloom continuous casting[J]. Continuous Casting,2016,41(5):17.) [8] ZENG J,CHEN W,ZHANG S,et al. Development and application of final permanent magnet stirring during continuous casting of high carbon rectangular billet[J]. ISIJ International,2015,55(10):2142. [9] HAN Z,CHEN D,FENG K,et al. Development and application of dynamic soft-reduction control model to slab continuous casting process[J]. ISIJ International,2010,50(11):1637. [10] Moon C H,Oh K S,Lee J D,et al. Effect of the roll surface profile on centerline segregation in soft reduction process[J]. ISIJ International,2012,52(7):1266. [11] 宋佳友,单庆林,景财良,等. X65MS管线钢中心偏析改善的实践[J]. 中国冶金,2016,26(8):64. (SONG Jia-you,SHAN Qing-lin,JING Cai-liang,et al. Improvement on central segregation of pipeline steel X65MS[J]. China Metallurgy,2016,26(8):64.) [12] 吴国庆,邱明罡,代宗岭,等. 现代合金钢大方坯连铸机设计特点及生产实践[J]. 钢铁,2018,53(12):54. (WU Guo-qing,QIU Ming-gang,DAI Zong-ling,et al. Design features and production practice of modern alloy steel bloom caster[J]. Iron and Steel,2018,53(12):54.) [13] 周素强,成旭东,姜东滨,等. 邯钢中碳微合金钢板坯轻压下位置优化[J]. 中国冶金,2018,28(8):17. (ZHOU Su-qiang,CHENG Xu-dong,JIANG Dong-bin,et al. Optimization of soft reduction location of medium-carbon microalloyed continuously cast steel slab in Hansteel[J]. China Metallurgy,2018,28(8):17.) [14] 王璞,李少翔,陈列,等. 电磁搅拌对大圆坯结晶器冶金行为影响的探讨[J]. 钢铁,2019,54(8):82. (WANG Pu,LI Shao-xiang,CHEN Lie,et al. Investigation of mold metallurgical behavior under electromagnetic stirring for round bloom[J]. Iron and Steel,2019,54(8):82.) [15] 陈亮. 小方坯连铸20CrMnTiH齿轮钢宏观偏析控制[J]. 钢铁钒钛,2019,40(4):110.(CHEN Liang. Study on macro segregation control of continuous casting billet in gear steel 20CrMnTiH[J].Iron Steel Vanadium Titanium,2019,40(4):110.) [16] 曹同友,杨治争,袁凡成,等. 电磁搅拌和过热度对Q345钢铸坯内部质量的影响[J]. 钢铁研究,2011,39(6):1. (CAO Tong-you,YANG Zhi-zheng,YUAN Fan-cheng,et al. Effect of EMS and superheating on inner quality of Q345 slab[J]. Research on Iron and Steel,2011,39(6):1.) [17] 刘少伟,韩延申,刘青,等. 基于过热度变化的82B钢连铸末端电搅位置研究[J]. 钢铁研究学报,2018,30(9):716.(LIU Shao-wei,HAN Yan-Shen,LIU Qing,et al. Research on final-electromagnetic stirring position of 82B steel continuous casting based on superheat variation[J]. Journal of Iron and Steel Research,2018,30(9):716.) [18] LUO S,PIAO F,JIANG D,et al. Numerical simulation and experimental study of F-EMS for continuously cast billet of high carbon steel[J]. Journal of Iron and Steel Research,International,2014,21(4):51. [19] 陈亮,宋波,陈天明,等. 45钢连铸大方坯中心疏松与缩孔控制[J]. 钢铁,2018,53(8):49. (CHEN Liang,SONG Bo,CHEN Tian-ming,et al. Control countermeasures of center porosity and shrinkage in 45 steel continuous casting bloom[J]. Iron and Steel,2018,53(8):49.) [20] 张贯旭,杨树峰,李京社,等. 方坯轴承钢连铸过程中凝固行为[J]. 中国冶金,2018,28(11):17. (ZHANG Guan-xu,YANG Shu-feng,LI Jing-she,et al. Solidification behavior of billet bearing steel during continuous casting[J]. China Metallurgy,2018,28(11):17.) [21] Ayata K,Mori T,Fujimoto T,et al. Improvement of macrosegregation in continuously cast bloom and billet by electromagnetic stirring[J]. Transactions of the Iron and Steel Institute of Japan,1984,24(11):931. [22] 孙光涛,黄永生,包燕平,等. 改善弹簧钢55SiCr小方坯中心碳偏析的试验研究[J]. 连铸,2018,43(2):36.(SUN Guang-tao,HUANG Yong-sheng,BAO Yan-ping,et al. Experimental study on improvement of center carbon segregation in 55SiCr spring steel billet[J]. Continuous Casting,2018,43(2):36.) [23] 周力,左龙飞,马建超,等. 弹簧钢小方坯成分偏析改善实践[J]. 上海金属,2018,40(1):51.(ZHOU Li,ZUO Long-fei,MA Jian-chao,et al. Improvement in segregation of spring steel billet[J]. Shanghai Metals,2018,40(1):51.) [24] HAN Y,WANG X,ZHANG J,et al. Comparison of transverse uniform and non-uniform secondary cooling strategies on heat transfer and solidification structure of continuous-casting billet[J]. Metals,2019,9(5):543. [25] LONG M,CHEN D,ZHANG L,et al. A mathematical model for mitigating centerline macro segregation in continuous casting slab[J]. Metalurgia International,2011,16(10):19. [26] 曾杰,陈伟庆,曹长法,等. 轻压下对82B钢矩形坯内部质量的影响[J]. 炼钢,2015,31(4):63.(ZENG Jie,CHEN Wei-qing,CAO Chang-fa,et al. Effect of soft reduction on inner quality of 82B steel rectangular bloom[J]. Steelmaking,2015,31(4):63.) [27] 胡亮,郭红民,段少平. 凝固末端电磁搅拌对82B碳偏析的影响[J]. 中国冶金,2018,28(9):63.(HU Liang,GUO Hong-min,DUAN Shao-ping. Effect of F-EMS on carbon segregation of 82B[J]. China Metallurgy,2018,28(9):63.) [28] 王彪,谢植,贾光霖,等. 凝固末端电磁搅拌参数确定及其对中心偏析的影响[J]. 钢铁,2007,42(3):18.(WANG Biao,XIE Zhi,JIA Guang-lin,et al. Parameter determination and effects on center segregation of F-EMS[J]. Iron and Steel,2007,42(3):18.) [29] JIANG D,ZHU M. Center segregation with final electromagnetic stirring in billet continuous casting process[J]. Metallurgical and Materials Transactions B,2017,48(1):444. [30] MAO B,ZHANG G F,LI A W. Theory and Technology of Electromagnetic Stirring for Continuous Casting[M]. Beijing:Metallurgical Industry Press,2012. [31] WAN Y,LI M,CHEN L,et al. Effect of final electromagnetic stirring parameters on central cross-sectional carbon concentration distribution of high-carbon square billet[J]. Metals,2019,9(6):665. [32] Garnier M. Metallurgical application of MHD[J].Tetsu-to-Hagane,1985,71(16):1846. [33] 冯军,陈伟庆,王晓峰,等. 凝固末端电磁搅拌对高碳钢内部质量的影响[J]. 钢铁,2006,41(11):26.(FENG Jun,CHEN Wei-qing,WANG Xiao-feng,et al. Effect of white band on quality of billet cast with F-EMS[J]. Iron and Steel,2006(11):26.) [34] 曾杰,张森林,曹长法,等. 连铸坯凝固末端永磁搅拌与电磁搅拌对比研究[J]. 炼钢,2016,32(2):36.(ZENG Jie,ZHANG Sen-lin,CAO Chang-fa,et al. Comparison between permanent magnet stirring and final electromagnetic stirring during continuous casting bloom[J]. Steelmaking,2016,32(2):36.) [35] 田汉蒲,左著,吕士忠,等. 水平连铸电磁搅拌技术开发及应用[J]. 钢铁,2010,45(8):25.(TIAN Han-pu,ZUO Zhu,L Shi-zhong,et al. Development and application of electromagnetic stirring method in horizontal continuous casting[J]. Iron and Steel,2010,45(8):25.)
2020, Vol. 55 
