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Abstract <p>The microstructure and mechanical properties of ferritic–bainitic steel, i.e., the material of large-diameter pipes of strength class X70, have been studied after long-term operation of a main gas pipeline (linear section). Despite the development of strain aging during operation, the structure of the steel is found to have no signs of degradation, and the level of its mechanical properties meets the requirements of normative documentation.</p>

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Structure and Properties of X70 Pipeline Steel for a Main Gas Pipeline after Long-Term Operation

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • T. S. Esiev,
  • N. A. Tereshchenko,
  • I. L. Yakovleva

摘要

Abstract

The microstructure and mechanical properties of ferritic–bainitic steel, i.e., the material of large-diameter pipes of strength class X70, have been studied after long-term operation of a main gas pipeline (linear section). Despite the development of strain aging during operation, the structure of the steel is found to have no signs of degradation, and the level of its mechanical properties meets the requirements of normative documentation.