Effect of Surface Roughness of Mother Sheet on Occurrence of Oil-pit in Cold Rolling for SUS430 Sheet

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Other Title
  • SUS430鋼板の冷間圧延におけるオイルピットの生成におよぼす冷延素材粗さの影響
  • SUS430 コウハン ノ レイカン アツエン ニ オケル オイル ピット ノ

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Description

To produce cold rolled stainless steel sheets efficiently in high speed rolling, surface brightness must be improved. The surface brightness of the sheets is strongly affected by oil-pits which occur on the surface of the sheets in cold rolling. As the number of oil-pits decreases, the surface brightness of the sheets is improved.<BR>In this study, the morphology of oil-pits in actual cold rolling is observed by a microscope and SEM (Scanning Electron Microscopy). The effect of the surface roughness of the mother sheet on the occurrence of oil-pits in cold rolled sheet is examined with a laboratory-scale rolling mill.<BR>The results obtained are as follows :<BR>(1) Oil-pits occur at the bottom of micro-pits on the surface of the mother sheet, at the bottom of scratches which are marks due to the surface roughness of rolls and in the flat surface around the micro-pits and the scratches.<BR>(2) It can be explained that oil pits in the flat surfaces around micro-pits are formed by the squeezing of rolling oil from the micro-pits.<BR>(3) It can be explained that oil-pits at the bottom of the micro-pits and the scratches are caused by enclosure of rolling oil in the micro-pits and the scratches.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 81 (8), 809-814, 1995

    The Iron and Steel Institute of Japan

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