The Improvement of Surface Cracks on Leaded Free-cutting Steel Bloom

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  • OHBA Yasuhide
    Process Development Group, Research & Development Center, Sanyo Special Steel Co., Ltd.
  • TAKASU Ichiro
    Process Development Group, Research & Development Center, Sanyo Special Steel Co., Ltd.
  • KITADE Shinichi
    Casting Section, Steelmaking Department, Sanyo Special Steel Co., Ltd.
  • SHIMOGUCHI Haruyuki
    Quality Assurance Group, Technical Administration Department, Sanyo Special Steel Co., Ltd.

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  • 鉛含有はだ焼鋼鋳片の表面疵改善
  • ナマリ ガンユウ ハダヤキ コウチュウヘン ノ ヒョウメンキズカイゼン

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Abstract

This study was carried out in order to prevent surface cracks on continuous cast of leaded free-cutting steel. As the leaded steel is likely to suffer from surface cracks, prevention of the cracks is necessary for higher reliability of products. The majority of surface cracks of billets of this steel were found out to be bloom cracks originated due to not uniform cooling at the initial solidification of bloom. Consequently, this improvement of bloom surface cracks is important for the decrease of surface cracks of billets of this steel.<BR>From the view point of the uniform initial solidification near meniscus, mold powder was optimized. Three types of mold powder with different viscosity and different carbon content were evaluated through commercial production processes. Uniform initial solidification was realized by use of the mold powder with higher viscosity and higher carbon content. Consequently, surface cracks of the blooms cast continuously and the rolled billets were decreased.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 92 (7), 439-447, 2006

    The Iron and Steel Institute of Japan

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