Effect of combining F-EMS and MSR on the segregation and shrinkage cavity in continuously cast high-carbon steel blooms

被引：0
|
作者：
An H.-H. [1 ,2 ]
Bao Y.-P. [1 ]
Wang M. [1 ]
Zhao L.-H. [1 ]
Wang D.-Z. [1 ]
Liu R.-Q. [3 ]
Li P. [3 ]
机构：
[1] State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing
[2] School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing
[3] Changshu Longteng Special Steel Co. Ltd., Changshu
来源：
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | 2017年 / 39卷 / 07期
关键词：
Bloom; Final electromagnetic stirring; High-carbon wear-resistant ball steel; Macro segregation; Mechanical soft reduction;
D O I：
10.13374/j.issn2095-9389.2017.07.004
中图分类号：
学科分类号：
摘要：
This study established a two-dimensional mathematical model of solidification and heat transfer for a bloom with a 310 mm×360 mm cross-section using ANSYS software, which was verified by nail-shooting experiments in the narrow side of the bloom and surface temperature testing. The effect of the casting process parameters, such as superheat, casting speed, and secondary cooling intensity, on the solid fraction in the strand centerline and the solidified shell was investigated. Moreover, the optimum casting speed and the optimum solid fraction in the core of the partially solidified strand through the soft reduction zone were determined by the model considering the hot ductility of the high-carbon wear-resistant ball steel BU. Plant trials of BU with different casting speeds were performed to validate the theoretical model and analyze the effect of the casting speed on the segregation and shrinkage cavity of BU on a 310 mm×360 mm bloom caster equipped with final electromagnetic stirring (F-EMS) combined with mechanical soft reduction (reduction amount with 17 mm). The results show that the inner defects (e.g., center segregation, V-segregation, and shrinkage cavity) significantly improve when the casting speed is adjusted to meet the required soft reduction zone as a matter of priority; otherwise, the casting speed is only adjusted to preferentially satisfy the required F-EMS stirring region. The inner quality does not show any obvious improvement. Except for the internal cracks and the negative center segregation caused by the improper distribution of the reduction amount, the inner defects (e.g., macro segregation and shrinkage cavity) significantly improve with a casting speed of 0.52 m·min-1 and a solid fraction in the strand centerline ranging from 0.30 and 0.75 in the soft reduction zone. © All right reserved.
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页码：996 / 1007
页数：11
相关论文
共 22 条
  • [1] El-Bealy M.O., Macrosegregation quality criteria and mechanical soft reduction for central quality problems in continuous casting of steel, Mater Sci Appl, 5, 10, (2014)
  • [2] Raihle C.M., Fredriksson H., On the formation of pipes and centerline segregates in continuously cast billets, Metall Mater Trans B, 25, 1, (1994)
  • [3] Li W.S., Shen H.F., Liu B.C., Numerical simulation of macro segregation in steel ingots using a two-phase model, Int J Miner Metall Mater, 19, 9, (2012)
  • [4] Oh K.S., Chang Y.W., Macrosegregation behavior in continuously cast high carbon steel blooms and billets at the final stage of solidification in combination stirring, ISIJ Int, 35, 7, (1995)
  • [5] Domitner J., Wu M.H., Kharicha A., Et al., Modeling the effects of strand surface bulging and mechanical soft reduction on the macrosegregation formation in steel continuous casting, Metall Mater Trans A, 45, 3, (2014)
  • [6] Bode O., Schwerdtfeger K., Geck H.G., Et al., Influence of casting parameters on void volume and center segregation in continuously cast 100Cr6 blooms, Ironmaking Steelmaking, 35, 2, (2008)
  • [7] Ding N., Bao Y.P., Sun Q.S., Et al., Location determination of final electromagnetic stirring and its effect on central carbon segregation for SWRH82B steel, J Univ Sci Technol Beijing, 33, 1, (2011)
  • [8] Wang B., Zhang J.M., Xiao C., Et al., Formation mechanism of internal cracks in continuous casting slabs with soft reduction, Chin J Eng, 38, 3, (2016)
  • [9] An H.H., Han C.J., Han L.N., Et al., Solidification characteristics and slab quality of 40Cr of bloom caster, Continuous Casting, 1, (2013)
  • [10] Chen J., Zhu L.L., Xin L., Research and development on high grade hot rolling wear resistant ball steel B2, Special Steel Technol, 21, 2, (2015)
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