Abstract
It is essential to lubricate the shell since inadequate lubrication leads to defects in the steel product (e.g. longitudinal cracks, sticker breakouts and star cracks). The liquid layer of the slag film, formed between the shell and the mould, lubricates the newly formed shell; the lubrication increases with increasing liquid slag thickness (dl). Lubrication is usually represented by the powder consumption (Qs in units of kg slag (or powder) m−2) which is related to liquid film thickness (dl). However, there are several terms used for powder consumption and these terms are interrelated (e.g. Qs, Qt and QMR). The frictional forces acting on the shell are highest in the centre of slabs and thus slabs need more lubrication. The required powder consumption, Qs increases with increasing distance from the corner and thus Q slabs > Q blooms > Q billets . The required powder consumption can be calculated from the relation, Q reqs = 2/(R* – 5) where R* = {2(w + t)/w · t} = (surface area/volume) of the mould. However, the powder consumption, Qs, is also affected by other parameters, namely, the casting speed (Vc), slag viscosity (η), the break temperature of the slag and the oscillation frequency (f) and stroke (s). There is general agreement that Qs decreases with increasing casting speed and viscosity (e.g. empirical rules, Q slagsreq = 0.55/ η0.5 · Vc). There is some dispute with regard to the effect of f, s and Tbr but most plant studies indicate that Q slags req decreases as f, s and Tbr increase. The required values of powder consumption and viscosity can be calculated for the given casting conditions using empirical rules. The predictions of a mathematical model indicate that slag infiltration into the model/ strand channel occurs when the mould and slag rim are descending but little powder consumption occurs when the mould is ascending. The changes in mould direction are accompanied by periods of confused flow in the mouth of the channel and little slag infiltration occurs in these periods. Frictional forces and the factors affecting them are also discussed; it was found that liquid friction increased with increasing mould dimensions, slag viscosity, casting speed and (Vm − Vc). Plots of liquid friction (Fl) versus casting speed exhibit a minimum since Fl increases with increasing Vc but decreases with decreasing (Vm − Vc).
Abbreviations
- A :
-
Area (m2)
- % C free :
-
Percentage of free carbon
- % C total :
-
Percentage of total carbon
- % LOI:
-
Percentage of loss on ignition
- D C :
-
Mean particle size of the carbon
- D corn :
-
Distance mould corner to centre (m)
- D l :
-
Thickness of liquid slag film (m)
- F l :
-
Frictional force (N)
- f :
-
Frequency (Hz or cycles min−1)
- f* :
-
Fraction of powder forming slag
- Q cycle :
-
Powder consumption (kg m−1 cycle−1)
- Q MR :
-
Melting rate (kg/min or kg/s)
- Q s :
-
Powder consumption (kg/m2)
- Q t :
-
Powder consumption (kg/tonne−1)
- R* :
-
Mould (surface area/volume) (m−1)
- s :
-
Stroke length (m)
- T :
-
Temperature (oC)
- T br :
-
Break (or solidification) temperature,
- t :
-
Time (s) or thickness of mould (m)
- t cycle :
-
Time for one cycle (s or min)
- t n :
-
Negative strip time (s)
- t p :
-
Positive strip time (s)
- V c :
-
Casting speed (m/min)
- V m :
-
Velocity of mould (m/min or m/s)
- w :
-
Width of mould
- η :
-
Slag viscosity (dPas)
- ρ :
-
Density (kg/m3)
- powd :
-
Refers to powder
- slag :
-
Slag formed from powder
References
P.E. Ramirez-Lopez, K.C. Mills, P.D. Lee, B. Santilanna, Met. Mater. Trans. 43, 109, (2011).
A.B. Fox, PhD Thesis, Mould fluxes their properties and performance. Dept. of Materials, Imperial College, London, (2003).
Y Nuri, T Ohashi, N Miyasaka, K Shima, Y Uchida, Trans. ISIJ, 20, B170, (1980).
R. Saraswat, A.B. Fox, K.C. Mills, P.D. Lee, B. Deo, Scand. J. Met., 33, 85, (2004).
T. Kajitani, K. Okazawa, W. Yamada, H. Nakamura, ISIJ Intl. 46, 250, (2006).
M.S. Jenkins, PhD Thesis “Heat transfer in the continuous casting mould”, Monash Univ., Clayton, Vic., Australia, (1999).
Y. Itoh, S Nebeshima, K Sorimachi, Proc. 6th Intl. Conf. Molten slags, fluxes and salts, Stockholm, Paper 152 (2000) see also S Nebeshima, Y Itoh, H Tozawa, H Nakato, K Sorimachi, Proc. 4th Intl. Conf. Solidification Processing, Sheffield, 1997 (Sheffield Univ., 2997) p 10.
K. Tsutsumi, Tetsu- to Hagane, 84, 617, (1998).
A. Badri, B.T. Natarajan, CC Snyder, K.D. Powers, F.J. Byrne, M. Byrne, A.W. Cramb, Met. Mater. Trans. B, 36B, 355, (2005).
A. Badri, B.T. Natarajan, C.C. Snyder, K.D. Powers, F.J. Byrne, M. Byrne, A.W. Cramb, Met. Mater. Trans B, 36B, 373, (2005).
EY Ko, J Choi, JY Park, I Sohn, Met. Mater. Intl. 20, 141 and 1103 (2014).
E Anzai, T Shigezumi, T Nakano, T Ando, M Ikeda, Nippon Steel Technical Report, 34, 35, (1987).
C. Niggel, F. Felder. Lubrication by slag of continuous casting of steel. Report 9339, ECSC, (Europ. Comm. Sci and Tech. Publ., Luxembourg, 1985).
J. Kor, “An analysis of the fluid flow of liquid mould flux into space between continuous casting mold and steel shell” US Steel Report.
Y. Nuri, T. Ohashi, Trans. ISIJ, 20, B172, (1980).
S. Ogibayashi, Proc. 85th Steelmaking Conf. (2002) (ISS/AIME, Warrendale PA.) p. 175.
K. Okazawa,T. Kajitani, W. Yamada, H. Nakamura, ISIJ Intl., 46, 226 and 234 (2006).
K. Schwerdtfeger, K.H. Tacke, Fundamental study of behaviour of casting powders; Report EUR 9560, (Europ. Comm.Sci. and Tech Publ., Luxembourg, 1985).
YA Meng, BG Thomas, Met. Mater. Trans. B, 34B, 707, (2003).
S. Itoyama, CAMP- ISIJ, 14, 893, (2001).
P.E. Ramirez-Lopez, K.C. Mills, P.D. Lee, B. Santilanna, ISIJ Intl., 30, 1797, (2010).
C. Ojeda, J. Sengupta, B.G. Thomas, J. Barco, J.L. Aruna, Proc. AIST Tech., 2006 vol 1 (ISS, Warrendale, PA) p. 1017.
H.J. Shin, S.H. Kim, B.G. Thomas, G.G. Lee, J.M. Park, J. Sengupta, ISIJ Intl., 46, 1635, (2006).
XN Meng, MY Zhu, Can. Metall. Q, 50, 45, (2011).
ASM Jonayat, BG Thomas, Met. Mater. Trans. B, 45B, 1862, (2014).
T.H. Billany, K.C. Mills, Mould flux performance during continuous casting. Final Report ECSC Contract 7210 CA 820, 1987, (Europ. Comm. Sci. and Tech. Publ. Luxembourg, 1987).
R.J. Gray, Behaviour of mould fluxes during continuous casting. Report EUR 9495 EN 1985) (Europ. Comm. Sci. and Tech. Publ., Luxembourg.1985.
T. Okazaki et al., Tetsu-to Hagane, 65 (10), 265, (1985).
JM Hill, YH Wu, B Witwatanapataphee, J Eng. Math., 36, 311, (1999).
S Ogibayashi, CAMP- ISIJ, 18, 126 and 127 (2003).
T Emi, H Nakato, K Suzuki, Y Iida, T Ueda, Tetsu- to Hagane, 60 (7), 981, (1974) Henry Brutcher Translation HB9357.
T Fastner, C Furst, HP Narzt, G Xia, G Zuba, Proc. 3rd Europ. Conf. Continuous Casting Madrid, (UNESID, Madrid,1998) p. 791.
Y Fukuda, H Kawai, M Okimori, M Hojo, S Tanaka, Proc. 5th Intl. Conf. Slags, Fluxes and molten salts, Sydney,1997, (ISS, Warrendale, PA, 1997) p. 791.
S Ogibayashi, T Mizoguchi, T Kajatani, Intl. Workshop on Thermophys. Data for the Development of Mathematical models of solidification, Gifu City, Japan (1995).
BG Thomas, A Moitra, R McDavid, Iron and Steelmaker, 23 (4), 51 (1996).
Y. Meng, B.G. Thomas, Proc. ISS Tech., Indianapolis, 2003 (ISS, Warrendale, PA, 2003) p. 589.
MS Jenkins Proc. 78th Steelmaking Conf.,1995, (ISS, Warrendale, PA, 1995) p. 669.
MS Jenkins, BG Thomas, WC Chen, RB Mahapatra, Proc. 77th Steelmaking Conf., 1994, (ISS, Warrendale, PA 1994) p. 337.
JW Kim, S. K. Kim, D. S. Kim, Y. D. Lee, J. I. Eum, E. S. Lee., Proc. 78th Steelmaking Conf. 1995, (ISS, Warrendale, PA,1994) p. 333.
K Suzuki, C Matsumura, H Yamamoto, Y Kanrda, Proc. 73rd Steelmaking Conf., 1990, (ISS, Warrendale, PA, 1990) p 197.
M. Wolf, AIME Elect. Furn. Proc., 40, 335, (1982).
M. Wolf, Proc. 2nd Europ. Conf. Continuous Casting, Dusseldorf, 1994 (VDEh, Dusseldorf, 1994) vol 1, p 78.
S. Ogibayashi, K Yamaguchi, T Mukat, T Takahashi, Y Mimura, K Koyama. Y Nagano, T Nagano. Nippon Steel Technical Report, 34, 1, (1987).
Y. Nakamori, Y Fujikake, K Tokiwa, T Kataoka, S Tsuneoka, H Misumi, Proc. 10th Conf. IMEKO TC3 on Measurement and Mass held Kobe, Japan Sept. (1984) and Tetsu-to Hagane, 70(8),1282, (1984).
S. Sridhar, K.C. Mills, V. Ludlow, S.T. Mallaband, Proc. 3rd Europ. Conf. Continuous Casting, Madrid, 1998, (UNESID, Madrid,1998) p. 807.
F Neumann, J Neal, MA Pedroza, AH Castillejos, FA Acosta, Proc. 79th Steelmaking Conf. 1996. (ISS, Warrendale, PA,1996) p. 249.
K.C. Mills, S. Sridhar, A.S. Normanton, S.T. Mallaband, Proc. Brimacombe Conf., Vancouver, BC, 2000,p 781.
K.C.Mills, A.B. Fox, ISIJ Intl.,43, 1479, (2003).
H. Maeda, T. Hirose, CAMP-ISIJ, 6, 280, (1993).
K Koyama, K Nagano, Y Nagano, T Nakano, Nippon Steel Technical. Report, 34, 41, (1987).
OD Kwon, J Choi, IR Lee, JW Kim, KH Moon, YK Shin, Proc.74th Steelmaking Conf.,1991, (ISS, Warrendale, PA,1991) p. 561.
K. Nakajima, S Hiraki, T Kanazawa, T Murakami, CAMP-ISIJ, 5, 1221, (1992).
K. Tsutsumi, H Murakami, S Nishioka, M Tada, M Nakada, M Komatsu, Tetsu- to- Hagane, 84, 617, (1998).
P E Ramirez-Lopez, P.D. Lee, K.C. Mills, ISIJ Intl., 50 (3), 425, (2010).
M Kawamoto, T Mizukami, M Hanao, H Kikikuchi, T Watanabe, Ironmaking and Steelmaking, 29,199, (2002).
K Watanabe, K Tsutsumi, M Suzuki, H Fujita, S Hatori, T Omoto, ISIJ Intl., 54, 865, (2014).
T. Kitagawa, M. Ishiguro, Proc. 4th Japan-Germany Seminar, (ISIJ, Tokyo, 1980) p. 249.
T. Kajitani, K. Okazawa W. Yamada, H. Yamamura, ISIJ Intl., 46, 250 and 1432 (2006).
IR Lee, JW Kim, J Choi, D Kwon, YK Shin, Proc. Conf. on Continuous casting in developing countries, Beijing, 1993, (SEAISI, Singapore, 1993) p. 814.
T. Mizukami, K Kawakami, T Kitagawa, M Suzuki, S Uchida, Y Komasu, Trans. ISIJ, 26, B164, (1986).
M Suzuki, H Mizukami, T Kitagawa, K Kawakami, S Uchida, Y Komatsu, ISIJ Intl., 31, 254, (1991).
M. Wolf, “Effects of mould oscillation” presented Discussion Group on Continuous casting of mould fluxes, Inst. of Metals, London (1984).
M. Wolf, Proc. Conf. Continuous casting of steel in developing countries, Beijing, China (1994) p. 69.
K. Tsutsumi, T. Nagasaka, M. Hino, ISIJ Intl., 39, 1150, (1999).
T. Emi, H Nakato, K Suzuki, Y Iida, Proc. NOH- BOS Conf. (1978) p. 350.
H. Nakato, I. Muchi, Tetsu-to- Hagane, 66, 33, (1980).
H. Nakato T Sakuraya, T Nozaki, T Emi, H Nikoshawa, Mould fluxes for continuous casting and bottom pour teeming (ISS, Warrendale, PA, 1987) p. 23.
K. Noguchi, K. Sawamura, Proc. 4th Intl. Conf. Cont. Casting, Brussels (1988) (CRM/VDEh) p. 65.
Y. Kobayashi, S. Maruhashi,” Effects of operational on oscillation mark of continuously cast, stainless steel slabs” Proc. 4th Japan-CSSR Seminar, Ostrava. (1983) p. 249.
S. Shimizu, Y. Imada et al., Proc. 6th Intl. Iron and Steel Congress (1990) p. 487.
M. Suzuki, S Miyahara, T Kitagawa, S Uchida, K Okimoto, Tetsu-to Hagane, 78, 113, (1992).
M Ikeda, K Asano, T Nakano, M Fuji, S Mizoguchi, H Mizumi, Trans. ISIJ, 21, B 511, (1981).
T. Mallaband, Metallugica. UK, private communication cited in AB Fox thesis [1].
T. Mukongo, C Pistorius, A Garbers-Craig, Ironmaking Steelmaking, 31,135, (2004).
Q. Wang, Y. Lu, S. He, K.C. Mills, Z.S. Li, Ironmaking and Steelmaking, 38, 297, (2011).
H Lei, Y Zhao, DQ Geng, ISIJ Intl., 54, 1629, (2014).
T Kishi, H Takeuchi, M Yamamiya, H Tsuboi, T Nakano, T Ando, Nippon Steel Tech. Report, 34, 11, (1987).
M Hanao, Y Tsukaguchi, M Kawamoto, Proc. 4th Intl. Congress Science and Technol., 2008, Gifu, Japan (ISI J, Tokyo, 2008), p. 694.
R. Koldwein, Unpublished Corus Internal Rept (2007) cited in KC Mills, J Kromhout, A Hamoen, R Boom: Proc. Admet Conf, Dnipropetrovsk, 2007(Natl. Metall. Acad. Ukr., Dnipropetrovsk, 2007) vol 2 p 174.
M Washio, M Sugizawa, S Moriwaki, K Kariyaa, S Idogawa, S Takeuchi, Revue de Metallurgie, CIT, 90 (April), 507, (1993).
D W van der Plas, C Platvoet, B Diesesme, JP Radot, JM Galpin, Proc. 2nd Europ. Conf. Continuous casting, Dusseldorf, 1994, Metec Congress’94 (VDEh, Dusseldorf, 1994) p. 109.
MY Ha, SG Lee, SH Seong, J. Mater. Processing Technol. 133. 322, (2003).
G Bocher, U Hoffman, P Muller, Proc. 2nd Europ. Conf. Continuous casting, Dusseldorf, 1994, Metec Congress’94 (VDEh, Dusseldorf, 1994)p. 102.
J Kromhout, RS Schimmel, Proc. 8th Europ. Conf. Continuous casting, Graz, Austria, 2014 (Austrian Met Mater. Soc., Vienna, 2014).
M Tani, T Toh, K Umetsu, K Tanaka, M Zeze, K Tsunenari, K Hayashi, S Fukunaga, Nippon Steel Technical Report, 104, 62, (2013).
JK Park, JW Cho, KH Moon, SH Lee, KH Kim, HS Jeong, Proc. 7th Intl. Conf. Clean Steel, Balatonfured, Hungary, 2007, (Hung. Min. Metall. Soc, Budapest, 2007) p. 264.
M. Wolf, Proc. 2nd Europ. Conf. Continuous Casting, METEC Congress’94 held Dusseldorf, 1994 VDEh, Dusseldorf, 1994), vol 1, p 78.
H Uchiyama, Proc. AISI Technical Committee on Strand casting, 1995 p.
J Sardemann, H Screwe, Stahl u Eisen, 111, (11), 39, (1991).
H Yamamura, T Kajitani, J Nakashima, M Yamasaki, S Mineta, Nippon Steel Technical Report, 104, 54, (2013).
K Tsutsumi, J Ohtake, M Hino, ISIJ Intl., 40, 601, (2000).
H Steinruch, C Rudischer, W Schneider, Non-linear Analysis, Theory, Methods and Applications, 30 (8), 4915, (1997) see also BHM 141 (1996)(9) 399.
H Steinruch, C Rudischer, W Schneider Proc. Conf. Modelling of Casting Welding and Advanced Solidification processes VIII (MCWASP)(Minerals, Metals and Materials Soc. 1998).
PP Sahoo, S Basu, ISIJ Intl., 46, 219, (2006).
M Wolf, Trans ISIJ, 22, B204, (1982).
TJ Billany AS Normanton, KC Mills, P Grieveson, Ironmaking and Steelmaking 18, 403, (1991).
K. Sorimachi, Proc. 5th Intl. Conf. Molten slags, fluxes and salts, Sydney,1997, (ISS,Warrendale, PA, 1997) p. 781.
PV Riboud, Y Roux, Fundamental study of the behaviour of casting powders. Report EUR 9560,1985 (Eur. Comm. Sci and Tech. Publ., Luxembourg, 1985).
R.D.’Haeyer, Influence of chemical composition of continuous casting powders Report EUR 10326 EN (1987) (Eur. Comm. Sci and Tech. Publ., Luxembourg, 1987).
Y Nakamori et al, Nippon Steel Tech. Report, 34, 53, (1987).
B Mairy, D Ramelot, M Dutrieux, Proc, Technol. Conf., Measurement and Control Instrumentation in the Iron and steel Industry, Detroit, 1985 (ISS, Warrendale, 1985) p. 101.
G. Saucedo et al, Proc.74th Steelmaking Conf. (1991) (ISS, Warendale, PA, 1991) p 79.
D. Bowen: Proc. Seminar on Mould powders for continuous casting, held British Steel Teesside Laboratories, Sept (1989) Paper 8.
L. Hering, HP Heller, HW Fenske., Stahl u Eisen, 17, 61, (1992).
S. Ogibayashi et al, Proc.78th Steelmaking Conf., Nashville, TN, 1995, (ISS, Warrendale, PA,1995) p. 451.
H Mizukami, M Komatsu, T Kitagawa, K Kawakami, Trans ISIJ, 24, B 181, (1984).
H Mizukami, K Kawakami, S Miyahara, M Suzuki, T Kitagawa, O Terada, Trans. ISIJ, 25, B 300, (1985).
H Mizukami, A Ozeki, A Kurabayashi, N Hsebe, S Uchida, T Kitagawa, Trans ISIJ, 25, B 301, (1985).
T Sohlgren, private communication, Sweden, 2015.
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Mills, K.C., Däcker, CÅ. (2017). Slag Infiltration, Lubrication and Frictional Forces. In: The Casting Powders Book. Springer, Cham. https://doi.org/10.1007/978-3-319-53616-3_2
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