Abstract
A coupled three-dimensional numerical model combining fluid flow, heat transfer, and solidification has been established to study the effect of two types of nozzle on the internal quality of LZ50 steel in a φ 690 mm sized continuously cast round bloom. The model is validated by measured data of the strand surface temperature for plant tests. According to the simulation and experimental results, it is found that the larger tangential velocity on meniscus and the higher vortex depth in the six-port nozzle is beneficial to melting mold powder and the floating removal of inclusions. When the injection mode is the six-port nozzle, the level fluctuation was an effective control to avoid slag entrapment, and the washing effect with multiple swirling flow reinforces both the heat exchange through the solidification front and the dendrite re-melting or fragmenting, stimulating the formation of an equiaxed crystal at the round bloom center. As the injection mode changes from the five-port nozzle to the six-port nozzle, the superheat degree in the round bloom center at the mold exit decreases by 9.3 K, which is one of the resulting increase in the center equiaxed crystal ratio is about 4.3% and the length of columnar decreases by 20 mm. A weaker im**ement of the outlet flow on the shell has been observed as well, which can be expected to eliminate the popular subsurface white band phenomenon with an even shell thickness in the mold region. This suggests that the six-port nozzle can effectively improve the quality of large round bloom casting.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Cai KK (2008) Continuous casting mold. Metallurgical Industry Press, Bei**g
Sun HB, Li L (2016) Application of swirling flow nozzle and investigation of superheat dissipation casting for bloom continuous casing. Ironmaking Steelmaking 43(3):228–233
Yamane H, Ohtani Y, Fukuda J, Kawase T, Nakashima J, Kiyose A (1997) Steelmaking Conf Proc 80:159–164
Fang Q, Ni HW et al (2017) The effects of a submerged entry nozzle on flow and initial solidification in a continuous casting bloom mold with electromagnetic stirring. Metals Open Access Metall J 7(4):146
Wang P, Li SX, Zhang JQ et al (2019) Swirling flow effect of radial outlet nozzle for bloom and its effect on initial solidification. China Metall 29(09):15–22
Sun HB, Han ZG, Qian HZ et al (2010) Effects of injection modes on the flow pattern and temperature distribution of molten steel in a bloom casting mould. Chin J Eng 32(9):1131–1137
Sun HB, Zhang JQ (2014) Macrosegregation improvement by swirling flow nozzle for bloom continuous castings. Metall Mater Trans B 45(3):936–946
Wang C, Zhang H, Ma Z W et al (2014) Simulation study on optimization of nozzle structure for round mould. J Iron Steel Res 026(003):15–20,26
Cheng XW, Fu QH, Dai FQ et al (2015) Application of swirling flow nozzle technology for bloom continuous castings. Steelmaking 031(005):32–37
Wang P, Zhang JQ et al (2019) Initial transfer behavior and solidification structure evolution in a large continuously cast bloom with a combination of nozzle injection mode and M-EMS. Metals 9(10):1083–1097
Wang P, Zhang JQ et al (2019) Effect of different types of nozzles on swirling flow development and shell growth behavior in a bloom casting mold. In: AISTech2019
Li SX, Zhang XM, Li L et al (2019) Representation and effect of mushy zone coefficient on the coupled flow and solidification simulation during continuous casting. Chin J Eng 41(2):199–208
Aboutalebi MR, Guthrie RIL, Seyedein SH (2007) Mathematical modeling of coupled turbulent flow and solidification in a single belt caster with electromagnetic brake. Appl Math Model 31(8):1671–1689
Lai KYM, Salcudean M, Tanaka S et al (1986) Mathematical modeling of flows in large tundish systems in steelmaking. Metall Trans B 17(3):449–459
Li SX, Lan P, Tang H et al (2018) Study on the electromagnetic field fluid flow and solidification in a bloom continuous casting mold by numerical simulation. Steel Res Int 89(12):1800071
Yuan Q, Vanka SP, Thomas BG et al (2004) Computational and experimental study of turbulent flow in a 0.4-scale water model of a continuous steel caster. Metall Mater Trans 35(5):967–982
Thomas BG (2006) Modeling of continuous casting defects related to mold fluid flow. Iron Steel Technol 3(7):127
Thomas BG, Zhang L (2007) Mathematical modeling of fluid flow in continuous casting. Trans Iron Steel Inst Japan 41(10):1181–1193
Xu ZG, Wang XH, Jiang M et al (2016) Investigation on formation of equiaxed zone in low carbon steel slabs. Metall Res Technol 113(1):106–116
Zhang LF et al (2010) Transient fluid flow phenomena in continuous casting tundishes. Iron Steel Technol 7(7):55
Li YQ, Liu JH, He Y et al (2019) Surface defects analysis and mechanism research of 15CrMoG steel bars and process improvement. Special Steel 40(6):1–6
Sun H, Li L, Wu X et al (2018) Effect of subsurface negative segregation induced by M-EMS on componential homogeneity for bloom continuous casting. Metall Res Technol 115(6):603
Beckermann C, Diepers HJ (1999) Modeling melt convection in phase field simulations of solidification. Comput Phys 154:468–496
Acknowledgements
The authors wish to acknowledge the financial support of the National Natural Science Foundation of China (No. U1860111, and 51874033).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2021 The Minerals, Metals & Materials Society
About this paper
Cite this paper
Wang, P. et al. (2021). Effect of Nozzle Injection Mode on Initial Transfer Behavior of Round Bloom. In: TMS 2021 150th Annual Meeting & Exhibition Supplemental Proceedings. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65261-6_53
Download citation
DOI: https://doi.org/10.1007/978-3-030-65261-6_53
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-65260-9
Online ISBN: 978-3-030-65261-6
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)