Effect of P on Hydraulic-descaling-ability in Si-added Hot-rolled Steel Sheets

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  • FUKAGAWA Tomoki
    Corporate Research & Development Laboratories, Sumitomo Metal Industries, Ltd.
  • OKADA Hikaru
    Corporate Research & Development Laboratories, Sumitomo Metal Industries, Ltd.
  • FUJIKAWA Hisao
    Sumitomo Metal Industries, Ltd.

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Other Title
  • Si添加熱延鋼板の高圧水によるデスケーリング性に及ぼすPの影響
  • Si テンカ ネツエン コウハン ノ コウアツスイ ニヨル デスケーリングセイ

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Abstract

Scale defects, called "red-scale", frequently form in Si-added hot-rolled steel sheets because of poor hydraulic-descaling-ability in hot-rolling process. In this work, effect of P on the hydraulic-descaling-ability in Si-added hot-rolled steel sheets and the mechanism of descaling are investigated by red-scale reproduction test and the analysis of Fe-Si-P oxide.<BR>(1) Addition of P to Si-added steel improves the hydraulic-descaling-ability.<BR>(2) Because the addition of P lowers binary eutectic temperature of FeO/Fe2SiO4 oxides formed during slab soaking. Therefore the liquid eutectic compound in the scale/steel interface during the descaling improves the hydraulic-descaling-ability.<BR>(3) Furthermore high slab soaking temperature in addition to increase of P is more effective to improve the hydraulic-descaling-ability because of high descaling temperature.<BR>(4) The Fe-Si-P scales were synthesized from mixtures of the reagents of Fe, Fe3O4, SiO2 and P2O5. Decrease in the binary eutectic temperature of FeO/Fe2SiO4 with P2O5 is clarified by thermal analysis of them.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 83 (5), 305-310, 1997

    The Iron and Steel Institute of Japan

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