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<p>High-frequency-welded oil well pipes are widely used in the petrochemical industry as casings and transmission pipelines. This study investigated the microstructure and mechanical properties of high-frequency-welded straight-seam pipes before and after heat treatment. The base material and the weld in the as-welded joints showed significant microstructural differences. The base material consisted mainly of coarse polygonal ferrite with martensite–austenite constituents distributed along the grain boundaries. By contrast, the weld consisted of elongated martensite. After heat treatment, the microstructural differences between the base material and the weld metal were reduced, and martensite was abundant in both regions. Heat treatment altered the joint microstructure, enhancing mechanical properties. Flaring tests—using custom fixtures—evaluated both joint types. The maximum destructive loads were 50.6 kN (as-welded) and 142.9 kN (heat-treated), confirming a substantial increase after heat treatment. The research findings are expected to advance the adoption of high-frequency welded pipes in oil well tubing applications.</p>

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Effects of Heat Treatment on the Mechanical Properties of High-Frequency Welded Pipe Flaring

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Peng Wang,
  • Xudong Wang,
  • Ziping Liu,
  • Jiakuan Ren,
  • Qi Ji,
  • Jian Long

摘要

High-frequency-welded oil well pipes are widely used in the petrochemical industry as casings and transmission pipelines. This study investigated the microstructure and mechanical properties of high-frequency-welded straight-seam pipes before and after heat treatment. The base material and the weld in the as-welded joints showed significant microstructural differences. The base material consisted mainly of coarse polygonal ferrite with martensite–austenite constituents distributed along the grain boundaries. By contrast, the weld consisted of elongated martensite. After heat treatment, the microstructural differences between the base material and the weld metal were reduced, and martensite was abundant in both regions. Heat treatment altered the joint microstructure, enhancing mechanical properties. Flaring tests—using custom fixtures—evaluated both joint types. The maximum destructive loads were 50.6 kN (as-welded) and 142.9 kN (heat-treated), confirming a substantial increase after heat treatment. The research findings are expected to advance the adoption of high-frequency welded pipes in oil well tubing applications.