Heat transfer behavior and homogenous solidification control for high-speed continuous casting slab mold

ZHU Miao-yong; CAI Zhao-zhen

doi:10.13374/j.issn2095-9389.2021.12.01.002

Volume 44 Issue 4

Apr. 2022

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2022 > 44(4): 703-711

ZHU Miao-yong, CAI Zhao-zhen. Heat transfer behavior and homogenous solidification control for high-speed continuous casting slab mold[J]. Chinese Journal of Engineering, 2022, 44(4): 703-711. doi: 10.13374/j.issn2095-9389.2021.12.01.002

Citation:

ZHU Miao-yong, CAI Zhao-zhen. Heat transfer behavior and homogenous solidification control for high-speed continuous casting slab mold[J]. Chinese Journal of Engineering, 2022, 44(4): 703-711. doi: 10.13374/j.issn2095-9389.2021.12.01.002

Citation:

PDF( 2082 KB)

Heat transfer behavior and homogenous solidification control for high-speed continuous casting slab mold

doi: 10.13374/j.issn2095-9389.2021.12.01.002

ZHU Miao-yong^,,
CAI Zhao-zhen

School of Metallurgy, Northeastern University, Shenyang 110819, China

More Information

Corresponding author: E-mail: myzhu@mail.neu.edu.cn
Received Date: 2021-12-01
Available Online: 2022-01-26
Publish Date: 2022-04-02

Abstract

Abstract

High-speed continuous casting is the theme for developing a new generation of high-efficiency continuous casting technology as well as a high-efficiency and green steelmaking production line. Presently, the actual casting speed for slabs in China is no more than 1.8 m·min^?1, and it is in the range of 1.2–1.4 m·min^?1 for continuous casting of peritectic steel. With the increase in the casting speed, the negative factors affecting the solidification in continuous casting mold become more evident, and the lubrication between mold copper plate and solidifying shell deteriorates. The friction force increases due to the increase of heat flux and decrease of mold flux consumption. Hence, the thickness of solidifying shell reduces and becomes nonuniform, decreasing its ability to resist all types of stress and strain during casting. Thus, the occurrence of breakout and cracks with high frequency greatly influences production. The technical issue of high-speed casting and the key to making it a reality should be resolved to ensure homogeneous growth. In this paper, the behavior of heat transfer and solidification in slab mold with high-speed casting for peritectic steel was analyzed. The effect of casting speed on the interfacial heat transfer resistance and the distribution of temperature and stress for solidifying shells in mold were investigated. It was found that the interfacial heat resistance increased evidently as the casting speed was greater than 1.6 m·min^?1. The thickness of solidified shell at the exit of the mold was reduced by approximately 10%, as the casting speed increased from 1.4 m·min^?1 to 1.6 m·min^?1 and 1.8 m·min^?1, making it more dangerous for breakout. The relative technologies such as the shape, flux, oscillation, and surface fluctuation for mold with homogenous solidification were presented and discussed. The optimization of mold inner cavity fitting for the growth of solidifying shell should be considered first for the uniformity control of peritectic steel solidification in a high-speed continuous casting mold. It is critical to design mold flux that adjusts to the solidification characteristics of peritectic steel. Moreover, the control of strand bulging is the key to stabilizing the mold surface.
- high-speed continuous casting,
- homogenous solidification,
- peritectic steel,
- continuous casting mold with high-efficiency heat transfer,
- mold flux,
- mold free surface control

FullText(HTML)

References(25)

References

[1]	朱苗勇. 高拉速連鑄過程傳輸行為特征及關鍵技術探析. 鋼鐵, 2021, 56(7):1 Zhu M Y. A study of transport phenomena and key technologies for high-speed continuous casting of steel. Iron Steel, 2021, 56(7): 1
[2]	鄧小旋, 潘宏偉, 季晨曦, 等. 常規低碳鋼板坯的高速連鑄工藝技術. 鋼鐵, 2019, 54(8):70 Deng X X, Pan H W, Ji C X, et al. Review on high speed conventional slab continuous casting of low carbon steels. Iron Steel, 2019, 54(8): 70
[3]	Suzuki M, Suzuki M, Nakada M. Perspectives of research on high-speed conventional slab continuous casting of carbon steels. ISIJ Int, 2001, 41(7): 670 doi: 10.2355/isijinternational.41.670
[4]	Lee S M, Hwang J Y, Lee S H et al. Revamping of the no. 2-3 slab caster at Posco gwangyang: Design, start-up and initial operation results. La Metallurgia Italiana, 2009(1): 33
[5]	Li L P, Wang X H, Deng X X, et al. Application of high speed continuous casting on low carbon conventional slab in SGJT. Steel Res Int, 2014, 85(11): 1490 doi: 10.1002/srin.201300426
[6]	Suzuki M, Yu C H, Sato H, et al. Origin of heat transfer anomaly and solidifying shell deformation of peritectic steels in continuous casting. ISIJ Int, 1996, 36(Suppl): S171 doi: 10.2355/isijinternational.36.Suppl_S171
[7]	Azizi G, Thomas B G, Zaeem M A. Review of peritectic solidification mechanisms and effects in steel casting. Metall Mater Trans B, 2020, 51(5): 1875 doi: 10.1007/s11663-020-01942-5
[8]	Kumar D S, Rajendra T, Sarkar A, et al. Slab quality improvement by controlling mould fluid flow. Ironmak Steelmak, 2007, 34(2): 185 doi: 10.1179/174328107X155330
[9]	任磊. 寬板坯連鑄結晶器內鋼液流動與鑄坯表面質量的關系研究[學位論文]. 北京: 北京科技大學, 2017 Ren L. Dependence of the Surface Quality of a Wide Continuous Casting Slab on the Fluid Flow in the Mold [Dissertation]. Beijing: University of Science and Technology Beijing, 2017
[10]	Kanazawa T, Hiraki S, Kawamoto M, et al. Behavior of lubrication and heat transfer in mold at high speed continuous casting. Tetsu-to-Hagane, 1997, 83(11): 701 doi: 10.2355/tetsutohagane1955.83.11_701
[11]	蔡開科. 連鑄結晶器. 北京: 冶金工業出版社, 2008 Cai K K. Continuous Casting Mold. Beijing: Metallurgical Industry Press, 2008
[12]	蔡兆鎮, 朱苗勇. 板坯連鑄結晶器內鋼凝固過程熱行為研究. 金屬學報, 2011, 47(6):676 Cai Z Z, Zhu M Y. Simulation of thermal behavior during steel solidification in slab continuous casting mold. Acta Metall Sin, 2011, 47(6): 676
[13]	Cai Z Z, Zhu M Y. Thermo-mechanical behavior of peritectic steel solidifying in slab continuous casting mold and a new mold taper design. ISIJ Int, 2013, 53(10): 1818 doi: 10.2355/isijinternational.53.1818
[14]	Suzuki M, Mizukami H, Kitagawa T, et al. Development of a new mold oscillation mode for high-speed continuous casting of steel slabs. ISIJ Int, 1991, 31(3): 254 doi: 10.2355/isijinternational.31.254
[15]	Wolf M M. Mold heat transfer and lubrication control— —two major functions of caster productivity and quality assurance // 13th Process Technology Conference Proceedings. Nashville, 1995: 99
[16]	Kromhout J A, Schimmel R C. Understanding mould powders for high-speed casting. Ironmak Steelmak, 2018, 45(3): 249 doi: 10.1080/03019233.2016.1257557
[17]	Kuimoto H, Baka N, Kasai N, et al. Increase of casting speed of hypo-peritectic steel at Kashima No. 3 Caster// 7th European Conference on Continuous Casting. Dusseldorf, 2011: 1
[18]	Hanao M, Kawamoto M, Murakami T, et al. Mold flux for high speed continuous casting of hypoperitectic steel slabs. Metallurgical Research &Technology, 2006, 103(2): 82
[19]	Ogibayashi S, Mukai T, Mimura Y, et al. Mold powder technology for continuous casting of low-carbon aluminum-killed steel. Nippon Steel Tech Rep, 1987(34): 1
[20]	Thomas B G. Modeling of the continuous casting of steel-past, present and future. Metall Mater Trans B, 2002, 33(6): 795 doi: 10.1007/s11663-002-0063-9
[21]	王舉金, 張立峰, 陳威, 等. 卷渣類夾雜物在結晶器鋼液中成分轉變的動力學模型. 工程科學學報, 2021, 43(6):786 Wang J J, Zhang L F, Chen W, et al. Kinetic model of the composition transformation of slag inclusions in molten steel in continuous casting mold. Chin J Eng, 2021, 43(6): 786
[22]	Qin Q, Yang Z L. Finite element simulation of bulge deformation for slab continuous casting. Int J Adv Manuf Technol, 2017, 93(7): 4357
[23]	Lee J D, Yim C H. The mechanism of unsteady bulging and its analysis with the finite element method for continuously cast steel. ISIJ Int, 2000, 40(8): 765 doi: 10.2355/isijinternational.40.765
[24]	Wu C H, Ji C, Zhu M Y. Numerical simulation of bulging deformation for wide-thick slab under uneven cooling conditions. Metall Mater Trans B, 2018, 49(3): 1346 doi: 10.1007/s11663-018-1173-3
[25]	楊杰. 高錳高鋁鋼連鑄結晶器的潤滑特性與傳熱行為研究[學位論文]. 沈陽: 東北大學, 2018 Yang J. Lubrication Characteristics and Heat Transfer Behaviors in Continuous Casting Mold for High Mn High Al Steel [Dissertation]. Shenyang: Northeastern University, 2018