Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
권호 표지

The Analysis of Dynamic Pressure in the Molten Flux near the Meniscus during Mold Oscillation for the Continuous Casting of Steel

강의 연속주조시 Mold Oscillation에 따른 Flux층 내의 동적 압력변화 해석

  • Park, Tae-Ho (Dept. of Materials Science and Metallurgy, Kyungpook National University) ;
  • Kim, Ji-Hun (Center for Noncrystalline Materials, Department of Metallurgical Engineering Yonsei University) ;
  • Choi, Joo (Iron & Steel Making Research Team, Technical Research Laboratories, POSCO) ;
  • Ye, Byung-Joon (Dept. of Materials Science and Metallurgy, Kyungpook National University)
  • 박태호 (경북대학교 금속공학과) ;
  • 김지훈 (연세대학교 공과대학 재료공학부 준결정재료연구단) ;
  • 최주 (포스코 기술연구소) ;
  • 예병준 (경북대학교 금속공학과)
  • Published : 2004.02.20
Download PDF
⟨ Previous Next ⟩

Abstract

The pressure of the mold flux acting on the meniscus shell was investigated through the coupling analysis of heat transfer in the mold and fluid flow in the flux caused by the mold oscillation. Finite element method was employed to solve the conservation equation associated with appropriate boundary conditions. As reported by previous workers, the axial pressure is positive on the negative strip time and negative on the positive strip time. A maximum pressure is predicted toward the top of the meniscus shell which has the thin shell arid a maximum value is in proportion to the relative mold oscillation velocity. The relative mold oscillation velocity was changed by the effect of meniscus level fluctuation. Therefore the pressure of the mold flux acting on the meniscus shell was different each cycle of the mold oscillation due to the irregularity of relative mold oscillation velocity.

Keywords

References

  1. M. M. Wolf: Steelmaking conf. Proc., 'Mold oscillation guidelines', 74(1991)51-70
  2. I. Saucedo, J. Beech, and G. J. Davies: Metal Tech., 'Influence of meniscus freezing on surface defect formation in cast products', 9 (1982) 282-291 https://doi.org/10.1179/030716982803285693
  3. E. Takeuchi and J. K. Brimacombe : Met. Trans., 'Effect of oscillation-mark formation on the surface quality of continuously cast steel slabs', 16B (1985) 605-625
  4. M. Wolf: Ironmaking and Steelmaking, 'Strand surface quality of austenitic stainless steels: part I macroscopic shell growth and ferrite distribution', 13 (1986) 248-257
  5. RIST: Continuous casting of steel (1991)
  6. T. Emi, H. Nakato, Y. Iida, K. Emoto, R. Tachibana, T. Imai, and H. Bada : NOH-BOSC, 'Influence of physical and chenical properties of mold powders on the solidification and occurrence of surface defects of strand cast slabs', 61 (1978) 350-361
  7. H. Tomono, P. Ackermann, W. Kurz, and W. Heinemann: TMS-AIME, Warrendale, PA, 'Elements of surface mark formation in continuous casting of steel', (1982) 55-73
  8. E. Takeuchi and J. K. Brimacombe : Met. Trans., 'The Formation of Oscillation Marks in the Continuous Casting of Steel Slabs', 15B (1984) 493-509
  9. R. Bommaraju and E. Saad : Steelmaking conf. Proc., 'Mathematical modelling of lubrication capacity of mold fluxes', 73 (1990) 281-296
  10. B. Ho: Master's Thesis, University of Illinois at UrbanaChampaign, Urbana, IL, (1992)
  11. K. Schwerdtfeger and H. Sha : Met. Trans., 'Depth of oscillation marks forming in continuous casting of steel', 3IB (2000) 813-826
  12. J.J. Bikerman: Phvsical Surfaces, Academic Press, (1970) 12
  13. E. Matijevic : Surface and Colloid Science, Wiley-Interscience, 1 (1969) 81
  14. K. Sorimachi: in Proc. Of Modeling of Casting and Welding ProcessesII, 'Crystallization of mould powder affecting quality of strand cast slabs', (1983) 369-375.
  15. Y. M. Won, T. Yeo, K. H. Oh, 1. Park, J. Choi and C. H. Yim : ISU int., 'Analysis of mold wear during continuous casting of slab', 38(1) (1998) 53-62 https://doi.org/10.2355/isijinternational.38.53
  16. H. Tada, S. Nishioka, M. Komatsu and H. Murakami: ISIJ,'Initial stage solidification of steel', (1995) 60
  17. H. S. Park : pasco Technical report 'Heat transfer in meniscus zone during casting', 3( I) (1989) 69-76
  18. G. J. W. Kor: Proc. of 2nd Process Technology Conf. on Continuous Casting of Steel, 'An analysis of the fluid flow of liquid mold powder in the space between the continuous casting mold and the steel shell', 2 (1981) 124-132
  19. K. I. Tada, J. P. Birat, P. V. Riboud, M. Larrecq and H. Hackl : Trans. ISIJ, 'Modelling of slag rim formation and pressure in molten flux near the meniscus', 24 (1984) B382
  20. K. Kawakami, T. Kitagawa, H. Mizukami, H. Uchibori, S. Miyahara, M. Suzuki and Y. Shiratani : Tetsu-to-Hagane, 'Fundamental study and its application of surface defects of powder cast strands', 67 (1981) 150-159
  21. H. Nakato, T. Nozaki, Y. Habu, H. aka, T. Ueda, Y. Kitano and T. Koshikawa : Steelmaking Conf. Proc., 'Improvement of surface quality of continuously cast slabs by high frequency mold oscillation', 68 (1985) 361-365