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<p>The technological operation of expansion in the range of <i>e</i> = 0–1.2% has a&#xa0;negligible influence on the standard mechanical characteristics of the base metal in straight-seam welded pipes made of L450M steel. The tensile strength practically does not change, and the yield strength decreases by approximately 6% in comparison to the base metal of the unexpanded pipe. At the same time, the relative elongation and relative reduction areas decrease by 6–8% as the degree of expansion increases. The impact toughness <i>KCV</i> of the base metal in straight-seam welded pipes is more sensitive to changes in the degree of expansion, and at <i>e</i> = 1.2% it increases by approximately 11% compared to the unexpanded pipe.</p>

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Influence of the degree of expansion on the mechanical characteristics of the base metal of welded straight-seam pipes made of L450M steel

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • I. M. Dmytrakh,
  • A. M. Syrotyuk,
  • V. V. Ovsyanykov,
  • R. L. Leshchak

摘要

The technological operation of expansion in the range of e = 0–1.2% has a negligible influence on the standard mechanical characteristics of the base metal in straight-seam welded pipes made of L450M steel. The tensile strength practically does not change, and the yield strength decreases by approximately 6% in comparison to the base metal of the unexpanded pipe. At the same time, the relative elongation and relative reduction areas decrease by 6–8% as the degree of expansion increases. The impact toughness KCV of the base metal in straight-seam welded pipes is more sensitive to changes in the degree of expansion, and at e = 1.2% it increases by approximately 11% compared to the unexpanded pipe.