Radiative Heat Transfer through Mold Flux Film during Initial Solidification in Continuous Casting of Steel.

• Cho Jungwook

  Graduate Student, Tohoku University

• Shibata Hiroyuki

  Institute for Advanced Materials Processing, Tohoku University

• Emi Toshihiko

  Institute for Advanced Materials Processing, Tohoku University

• Suzuki Mikio

  Institute for Advanced Materials Processing, Tohoku University

Abstract

Absorption coefficient and extinction coefficient for various commercial mold fluxes have been determined to quantify the radiative and the total heat transfer through the flux film in continuous casting mold. The absorption coefficient is found to be less than 1000 m^-1 for glassy specimens whereas the extinction coefficient is ca. 3000-30000 m^-1 for crystalline ones. Comparison of observed with calculated radiative heat flux from the absorption coefficient has shown that gray gas approximation is valid for evaluating the radiative heat flux across the mold flux film. Numerical calculation for both radiative and conductive heat transfer has been carried out for a given total thickness of the flux film. Despite little difference in optical properties among various mold fluxes, the radiative heat flux through molten layer of the flux films for low carbon and ultra low carbon steel is found larger than that for medium carbon steel. This is due to increasing thickness ratio of molten layer to crystalline layer of flux films. Solidifying and crystallizing behavior of mold fluxes is a key factor to control the radiative heat transfer in continuous casting mold, accordingly.

Journal

• ISIJ International

  ISIJ International 38 (3), 268-275, 1998

  The Iron and Steel Institute of Japan

Keywords

• absorption coefficient
• extinction coefficient
• mold flux
• radiative heat transfer
• continuous casting
• gray gas approximation

Details

• CRID: 1390282681429400448
• NII Article ID: 10002458928
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.38.268
• ISSN: 13475460
• ISSN: 09151559
• ISSN: http://id.crossref.org/issn/09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/38/3/38_3_268/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed