20CrMnTi钢160 mm×160 mm方坯内部质量控制

doi:10.13228/j.boyuan.issn0449-749x.20200274

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (4922 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In order to improve the severe internal quality problems in continuously cast 160 mm×160 mm billets of 20CrMnTi, industrial tests to optimize synergistically processing parameters of mold electromagnetic stirring(M-EMS) and final electromagnetic stirring(F-EMS) were carried out. The effects of technical parameters on the internal quality of 20CrMnTi billets were analyzed in detail through the chemical etching for the macrostructure and via measurements for the carbon contents. Besides,an infrared thermal image instrument was used to test the billet surface temperature,and ANSYS software was subsequently utilized to calculate the temperature variation during the solidification of the billet. Accordingly,the thickness of the liquid pool at F-EMS was obtained. The results show that the initial locations of columnar-to-equiaxed transition(CET) zone at the inner arc and outer arc sides are fixed around 42 and 28 mm,respectively,and they have only a little change within the range of M-EMS current intensity from 240 to 260 A. There exists negative segregation of carbon at 10 mm below the billet surface. However,carbon enriches in front of the CET zone and appears to be positive and negative segregation alternately in the solidification center. The negative segregation of carbon in the vicinity of the solidification center is positively correlated with the stirring intensity of M-EMS and F-EMS. According to the experimental results,the optimal parameters of M-EMS and F-EMS are 250 A/4.0 Hz and 300 A/7.0 Hz,respectively. Additionally,the liquid pool’s thicknesses vary from 66.2 mm at the entrance of F-EMS stirrer to 60.6 mm at the outlet of F-EMS stirrer and the corresponding solidification ratio ranges from 86.6% to 88.7%,which manifests that the current F-EMS implemented position is proposed.

Key words： 20CrMnTi macro-segregation of carbon mold electromagnetic stirring(M-EMS) final electromagnetic stirring(F-EMS)

Received: 28 May 2020

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	KANG Ji-bai
	WANG Wei-ling
	LUO Teng-fei
	LUO Sen
	ZHU Miao-yong

Cite this article:

KANG Ji-bai,WANG Wei-ling,LUO Teng-fei等. Internal quality control of 160 mm×160 mm square billet of 20CrMnTi steel with EMS[J]. Iron and Steel, 2021, 56(2): 82-92.

URL:

http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200274 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I2/82

[1] 何肖飞,曹燕光,王毛球,等. 齿轮钢晶粒尺寸对淬透性的影响[J]. 钢铁研究学报,2018,30(3):7.(HE Xiao-fei,CAO Yan-guang,WANG Mao-qiu, et al. Effect of grain size on hardenability of gear steel[J]. Journal of Iron and Steel Research,2018,30(3):7.)
[2] 印传磊, 林鹏, 张洪才, 等. 钢中氮含量对含硫齿轮钢硫化物影响的试验[J]. 中国冶金, 2020, 30(7): 61.(YIN Chuan-lei, LIN Peng, ZHANG Hong-cai,et al. Experiment on effect of nitrogen content in steel on sulfide of sulfur-containing gear steel[J]. China Metallurgy, 2020, 30(7): 61.)
[3] 郝广御, 袁康, 高静, 等. 含钛齿轮钢中CaO-Al₂O₃-TiO_x+TiN系夹杂物形成机理[J]. 钢铁, 2020, 55(10): 37. (HAO Guang-yu, YUAN Kang, GAO Jing,et al. Formation mechanism of CaO-Al₂O₃-TiO_x+TiN system inclusions in Ti-bearing gear steel[J]. Iron and Steel, 2020, 55(10): 37.)
[4] 谢海平,杨庆敏,刘骅震,等. 窄淬透性齿轮钢20CrMnTiH5工艺研究[J]. 中国冶金, 2013, 23(7): 24.(XIE Hai-ping,YANG Qing-min,LIU Hua-zhen,et al. Processing research on hardenability characteristic of gear steel 20CrMnTiH5[J]. China Metallurgy, 2013, 23(7): 24.)
[5] 孙海波,李烈军,吴学兴,等. 基于M-EMS工艺优化的齿轮钢偏析及淬透性带宽控制[J]. 钢铁,2018,53(8):6.(SUN Hai-bo,LI Lie-jun,WU Xue-xing. Control of segregation and hardenability band width by optimizing M-EMS parameters for gear steel[J]. Iron and Steel,2018,53(8):6.)
[6] 毛斌,张桂芳,李爱武. 连续铸钢用电磁搅拌的理论与技术[M]. 北京:冶金工业出版社,2012.(MAO Bin,ZHANG Gui-fang,LI Ai-wu. Theory and Technology of Electromagnetic Sirring for Continuous Casting[M]. Beijing:Metallurgical Industry Press,2012.)
[7] SUN H,LI L,YE D,et al. On the alternate stirring mode of F-EMS for bloom continuous castings[J]. Metallurgical and Materials Transactions B,2018,49(4): 10.
[8] 陈丰,许秀杰,杨子江,等. 连铸末端电磁搅拌工艺的优化与高碳钢铸坯质量[J]. 特种铸造及有色合金,2019,39(7): 4.(CHEN Feng,XU Xiu-jie,YANG Zi-jiang,et al. Optimization of final electromagnetic stirring in continuous casting and quality of high carbon steel billet[J]. Special Casting and Nonferrous Alloys,2019,39(7):4.)
[9] 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):9.
[10] 刘少伟,韩延申,管敏,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):7.(LIU Shao-wei,HAN Yan-shen,GUAN Min,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):7.)
[11] 孙海波,李烈军,程晓文,等. 大方坯末端电磁搅拌工艺参数优化与设计[J]. 炼钢,2015,31(4):6.(SUN Hai-bo,LI Lie-jun,CHENG Xiao-wen,et al. Optimizing and designing the technology parameters of the F-EMS for the bloom continuous casting[J]. Steelmaking,2015,31(4):6.)
[12] 李建超,王宝峰,王晓东,等. 连铸圆坯凝固末端电磁搅拌位置及工艺参数优化[J]. 特种铸造及有色合金,2014,34(8):4.(LI Jian-chao,WANG Bao-feng,WANG Xiao-dong,et al. Optimization of stirring position and parameters of final electromagnetic stirring process for continuous casting bloom[J]. Special casting and Nonferrous Alloys,2014,34(8):4.)
[13] WANG Ying-chun,LIU Qi-lin,LI Ying. Research on segregation control for round billet of anti-sulfur steel[J]. Metallurgical Process Research,2020,14(1):7.
[14] 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):4.(WANG Bo,CHEN Li,ZHANG Xu,et al. Study and application of the F-EMS position for the special steel bloom continuous casting[J]. Continous Casting,2016,41(5):4.)
[15] 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[J]. ISIJ International,1995,35(7):10.
[16] Lesoult G. Macro segregation in steel strands and ingots:Characterisation,formation and consequences[J]. Mater Sci Eng A-Struct Mater Prop Microstruct Process,2005,413:11.
[17] 李国忠,陈峰,陈伟庆,等. M-EMS对中碳钢连铸方坯碳偏析的影响[J]. 炼钢,2008,24(1):4.(LI Guo-zhong,CHEN Feng,CHEN Wei-qing,et al. Effect of mould electromagnetic stirring on carbon segregation of medium carbon continous cassting bloom[J]. Steelmaking,2008,24(1):4.)
[18] 侯忠霖. 传热条件对铝合金凝固组织影响的研究[D]. 大连:大连理工大学,2007.(HOU Zhong-lin. The Research on the Influence for Heat Transfer Condition to Solidification Structure of Aluminum Alloy[D]. Dalian:Dalian University of Technology,2017.)
[19] 张立峰,王升千,段加恒. 轴承钢中非金属夹杂物和元素偏析[M]. 北京:冶金工业出版社,2017.(ZHANG Li-feng,WANG Sheng-qian,DUAN Jia-heng. Non-Metallic Inclusions and Element Segregation in Bearing Steels[M]. Beijing:Metallurgical Industry Press,2017.)
[20] 侯自兵,成国光. 特殊钢连铸方坯中心区域宏观偏析定量化模型研究[J]. 连铸,2011(s1):6.(HOU Zi-bing,CHENG Guo-guang. Quantitative model on central region macrosegregation of continuously cast billet of special steel[J]. Continuous Casting,2011(s1):6.)
[21] Flemings M C. Our understanding of macrosegregation:Past and present[J]. ISIJ International,2000,40(9):9.
[22] 曾杰,陈伟庆. 高碳钢矩形坯轻压下中心负偏析形成机理[J]. 钢铁研究学报,2016,28(3):5.(ZENG Jie,CHEN Wei-qing. Formation mechanism of center negative segregation in continuous casting of high carbon rectangular billet with soft reduction[J]. Journal of Iron and Steel Research,2016,28(3):5.)
[23] 李少翔,王璞,兰鹏,等. 圆坯凝固末端电磁搅拌作用下的流动与传热行为[J]. 工程科学学报,2019,41(6):9.(LI Shao-xiang,WANG Pu,LAN Peng,et al. Melt flow and heat transfer at the crater end of round billet continuous casting using final electromagnetic stirring[J]. Chinese Journal of Engineering,2019,41(6):9.)
[24] 高龙永. 钢水凝固收缩与板坯铸机开口度参数设计[J]. 山东冶金,2012,34(1):3.(GAO Long-yong. Solidification shrinkage of molten steel and parameter design of slab caster opening[J]. Shandong Metallurgy,2012,34(1):3.)
[25] 姜东滨. 连铸凝固过程宏观偏析形成及外场作用规律模拟研究[D]. 沈阳:东北大学,2018.(JIANG Dong-bin. Simulation Study on Macrosegregation Formation and Field Effect During Solidification Process of Continuous Casting[D]. Shenyang:Northeastern University,2018.)