Failure Analysis of Seamless Line Pipe during Transportation by Ship

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  • 船積輸送したシームレス鋼管の損傷解析
  • フナズミ ユソウシタ シームレス コウカン ノ ソンショウ カイセキ

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Abstract

Break out had happened during field hydraulic test of unused line pipe. The observation of failure pipe indicated presence of the pre-damage at the broken portion. We supposed that the damage would have occurred during manufacturing or shipping. From analysis offracture surface and failure section, follow ing facts were revealed<BR>(1) The cracks propagate in wall thickness direction independently of the metal-flow of hot rolling direction.<BR>(2) The crack initiation sites are the external and the internal surfaces of the pipe and the cracks propagate stepwise with smooth fracture surface.<BR>(3) In the fracture surface, many corrosion products are observed and clear striations are locally recognized.<BR>It was concluded that the failure was caused by fatigue crack during shipment. This mechanism was confirmed by the pulsating bending fatigue test of pipes.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 71 (14), 1663-1669, 1985

    The Iron and Steel Institute of Japan

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