Mechanism of Fine Bubbles Entrapment beneath the Surface of Continuously Cast Slabs

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  • 連続鋳造中炭素鋼スラブにおける表皮下気泡の集積メカニズム
  • レンゾク チュウゾウチュウ タンソ コウスラブ ニ オケル ヒョウ ヒカ キホ

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Abstract

Origin of fine bubbles beneath the surface of continuously cast slab has been verified. In addition, the influence of fluid flow condition in mold on entrapment of the bubbles beneath meniscus has been investigated through a simulation experiment with water models. The results are summarized as follows.<BR>(1) The gases compositions in the bubbles were N2, Ar, H2 and CH4, and the origin of each composition was air leakage, Ar gas injected at slide gate, diffusive hydrogen in molten steel, and coal-tar pitch soaked in refractory of slide gate respectively.<BR>(2) Air leakage at the slide gate increased with passage of casting time, and the volume of leakage was estimated to be 100550Ncm3/s.<BR>(3) The size of bubble contained N2 gas was smaller than that contained Ar gas and found in mainly center of slab width direction.<BR>(4) The distribution of bubbles existence in slab width direction depended on bubble size and molten steel flow beneath meniscus.<BR>(5) An application of the airtight slide gate reduced the number of bubbles beneath the slab surface in the middle of width direction.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 83 (1), 24-29, 1997

    The Iron and Steel Institute of Japan

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