Refractory Tubes with Innovative Liner Technology for Flow Control and Clean Steel Applications

doi:10.19691/j.cnki.1004-4493.2021.02.007

China's Refractories ›› 2021, Vol. 30 ›› Issue (2): 35-40.DOI: 10.19691/j.cnki.1004-4493.2021.02.007

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Refractory Tubes with Innovative Liner Technology for Flow Control and Clean Steel Applications

Patrick SEITZ¹^,^*(), Yong TANG¹, Gerald NITZL²

1 RHI Magnesita, Leoben 8700, Austria
2 RHI Magnesita, Wien 1120, Austria

Online:2021-06-15 Published:2021-06-15
Contact: Patrick SEITZ
About author:Patrick Seitz obtained his master’s degree from the Montanuniversität Leoben in 2004. Then he joined RHI Magnesita to experience 6 years of Flow Control refractories marketing and technology. Since 2010, he has been working in the area of Isostatically Pressed Products (ISO), now responsible for the research and product development work.

Abstract

Abstract:

Ladle shrouds (LS) and submerged entry nozzles (SEN) are flow control products used in continuous casting which transfer the liquid steel from the ladle to the tundish and further to the mould. Due to the strongly different and quickly changing temperature conditions before and during steel casting, highly thermal shock resistant refractory materials are required which simultaneously save steel process energy. A new technology embeds a special liner into the refractory body inner surface to reduce the heat transfer through the LS/SEN wall. To better understand the function of this insulation layer a mathematical model was applied. Temperature measurements carried out in the steel plant were compared with the simulation results. The research results indicate potential heat loss reduction and performance improvements in the steelmaking process.

Key words: refractory tubes, flow control, computation fluid dynamics simulation

Patrick SEITZ, Yong TANG, Gerald NITZL. Refractory Tubes with Innovative Liner Technology for Flow Control and Clean Steel Applications[J]. China's Refractories, 2021, 30(2): 35-40.

Figures/Tables 14

Fig. 1 Isostatically pressed products for flow control application (a); Ladle shroud and submerged entry nozzle showing the liner material inside (b) ? RHI Magnesita

Fig. 2 Cut products showing the liner, see white coating in the bore ? RHI Magnesita

Fig. 3 Ladle shroud geometry and simulation cases, LS not insulated (a), decarburised (b) and liner (c) ? RHI Magnesita

Fig. 4 Illustration of mesh used in the simulation ? RHI Magnesita

Fig. 5 Boundary conditions for LS simulation ? RHI Magnesita

Fig. 6 Temperature profile of LS, No decarburised layer, only refractory body (a) decarburised (b) and liner (c)

Fig. 7 Undesirable steel solidification in SENs ? RHI Magnesita

Fig. 8 SEN simulation boundary conditions ? RHI Magnesita

Fig. 9 Simulation cases for upper part of the SEN,non-immersed area ? RHI Magnesita

Fig. 10 Temperature profile of the SEN

Fig. 11 The temperature distribution in the mould ? RHI Magnesita

Fig. 12 Surface temperature measurement for LS and SEN ? RHI Magnesita

Fig. 13 Brightness difference between a standard LS (left) and an LS with liner (a); surface temperature of LS during casting with vs. without liner (b) ? RHI Magnesita

Fig. 14 Surface temperature of SEN during casting with and without liner

References 10

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[10]	Chen Tian, Jingkun Yu, Endong Jin, Tianpeng Wen, Danbin Jia, Zhenli Liu, Paixian Fu, Lei Yuan. Effect of interfacial reaction behaviour on the clogging of SEN in the continuous casting of bearing steel containing rare earth elements. Journal of Alloys and Compounds, 2019, 792(5):1-7. DOI URL

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Refractory Tubes with Innovative Liner Technology for Flow Control and Clean Steel Applications

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