New Argon Stopper Technology for Slab Casting

doi:10.19691/j.cnki.1004-4493.2021.02.008

China's Refractories ›› 2021, Vol. 30 ›› Issue (2): 41-44.DOI: 10.19691/j.cnki.1004-4493.2021.02.008

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New Argon Stopper Technology for Slab Casting

Gerald NITZL¹^,^*(), Xiaohui LIU², Qingxin LIU², Jie SHEN³, Yong TANG⁴

1 RHI Magnesita, Wien 1120, Austria
2 RHI Magnesita, Dalian 116600, China
3 RHI Magnesita, Shanghai 200021, China
4 RHI Magnesita, Leoben 8700, Austria

Online:2021-06-15 Published:2021-06-15
Contact: Gerald NITZL
About author:Gerald Nitzl obtained his master’s degree from the university of applied science in Höhr-Grenzhausen in 1985. Since 2008, he has been working for RHI Magnesita, now responsible for the RHI Magnesita Ladle to Mould Refractory Systems global marketing

Abstract

Abstract:

Argon addition into the casting channel reduces the amount of clogging on the refractory wall to allow long sequence casting of aluminium-killed steel grades. The key to minimum surface defects on the final product is to establish the optimum quantity by optimising the gas distribution below the stopper nose. This is achieved by new argon stopper technology which supports low gas quantities with homogeneous gas and bubble distributions to float non-metallic inclusions (NMI) in the continuous casting mould.

Key words: argon stopper technology, slab casting, aluminium-killed steel, non-metallic inclusions

Gerald NITZL, Xiaohui LIU, Qingxin LIU, Jie SHEN, Yong TANG. New Argon Stopper Technology for Slab Casting[J]. China's Refractories, 2021, 30(2): 41-44.

Figures/Tables 9

Fig.1 Static pressure from tundish to mould ? RHI Magnesita

Fig. 2 Measured underpressure below the stopper nose depending on casting speed and argon flow rate in a liquid metal model ? RHI Magnesita

Fig.3 New stopper series 2.0 nose with continuous ring slot ? Gerald Nitzl/RHI Magnesita

Fig.4 New stopper technology nose shapes and design stype SHP from RHI Magnesita, compared to standard design ? RHI Magnesita

Fig.5 Flow pattern in continuous casting mould ? Gerald Nitzl/RHI Magnesita

Fig.6 Bubble distribution below the stopper nose in a water model left : standard, right: new technology ? Gerald Nitzl/RHI Magnesita

Fig.7 Bubble dispersion by new stopper technology ? RHI Magnesita

Table 1 Reduction of NMI index from a typical customer trial

NMI index	Standard stopper	New stopper technology
Al killed, IF	100	20-30
Ca treated	100	95

Fig. 8 Customer and supplied units with new stopper technology (Data: RHI Magnesita)

References 8

[1]	E. B. Pretorius, H. G. Oltmann, B. T. Schart. An overview of steel cleanliness from an industry perspective. AISTech 2013 conference Proceedings, 993-1026.
[2]	J M Galpin, P Naveau, H Visser, G. Sussek. An investigation on the mechanism of gas bubbles/inclusions entrapment in the solidified steel shell. Publications Office of the EU, 2005.
[3]	Ville Liisanantti, Jarno Pirinen, Jarkko Makala, Hannu Nevala. Benefits of stopper rods argon injection at Ruuki production Raahe works. ECCC2008.
[4]	Pavel Ernesto Ramirez Lopez, Pooria Nazem Jalali, Christer Nilsson. Adding argon injection to an advanced model for continuous casting of steel. 8^th European Continuous Casting Conference, Graz, Austria, 2014.
[5]	Brian G., Thomas, Alex Dennisov, Hua Bai. Behavior of argon bubbles during continuous casting of steel. ISS 80^th Steelmaking Conference, Proceedings, Chicago, USA, 1997 (80):375-384.
[6]	Gernot Hackl, Yong Tang, Gerald Nitzl, Chalmers D, Dorricott J.D., Heaslip L.J. Flow control refractory design optimization of submerged-entry nozzles by simulation technology. Proc. AISTech 2013 Proceedings.
[7]	Yong Tang, Gerald Nitzl, Gernot Hackl. Novel stopper designs to improve argon purging efficiency in slab casting. Proceedings of ISR2016, 2016, Zhengzhou, China.
[8]	KrumpelG., RHIAG, Austria, FuchsR., voestalpine Stahl LinzGmbH, Austria, PoschW., voestalpine Stahl LinzGmbH., Austria, MichelitschA., RHIAG., Austria, HacklG., RHIAG., Austria. Optimized Argon supply from tundish to mould by using the SHP stopper. METEC & 2^nd ESTAD 2015, Düsseldorf, Germany.

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New Argon Stopper Technology for Slab Casting

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References 8

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[1]	Hang YE, Tianfei MA, Gernot HACKL, Jianhua LUO, Gongjie TAO. Full-scale Water Modeling on Flow Field of Continuous Casting Mold [J]. China's Refractories, 2021, 30(2): 51-54.
[2]	Yong TANG*,Gerald NITZL,Gernot HACKL. Novel Stopper Designs to Improve Argon Purging Efficiency in Slab Casting [J]. , 2016, 25(4): 14-17.