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<p>The operational embrittlement, based on the determination of the impact toughness <i>KCV</i> of longitudinal and transverse specimens to the rolling direction of API 5L X67 steel of reserve pipe and operated for 34&#xa0;years on the gas main pipeline, was investigated. The influence of different orientations of the notch in the specimens relative to the rolling direction and the pipe axis was analyzed, and a&#xa0;significant influence of this factor on the impact toughness was revealed, which is generally higher for specimens with a&#xa0;notch oriented in the short transverse direction. The sensitivity of <i>KCV</i> to operational degradation was the highest for tests of transverse specimens with a&#xa0;concentrator in the axial direction. Using macrofractographic analysis, a&#xa0;typical low-energy delamination was observed along the rolling direction.</p>

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The influence of operation and notch orientation on the impact toughness of API 5L X67 steel

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • D. O. Demianchuk,
  • O. T. Tsyrulnyk,
  • P. R. Solovei,
  • H. M. Nykyforchyn,
  • O. I. Zvirko

摘要

The operational embrittlement, based on the determination of the impact toughness KCV of longitudinal and transverse specimens to the rolling direction of API 5L X67 steel of reserve pipe and operated for 34 years on the gas main pipeline, was investigated. The influence of different orientations of the notch in the specimens relative to the rolling direction and the pipe axis was analyzed, and a significant influence of this factor on the impact toughness was revealed, which is generally higher for specimens with a notch oriented in the short transverse direction. The sensitivity of KCV to operational degradation was the highest for tests of transverse specimens with a concentrator in the axial direction. Using macrofractographic analysis, a typical low-energy delamination was observed along the rolling direction.