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<p>The effect of heat treatment modes under production and laboratory conditions on the microstructure, impact toughness and microhardness of welded joints of steel 09G2S (9MnSi5) at negative temperatures is studied experimentally. It is shown that simulation of normalizing under laboratory conditions ensures the impact toughness values meeting the requirements of the SP.16.13330 Standard at a temperature of up to –60°C. The heat treatment modes used in the production provide an impact toughness meeting the requirements of SP.16.13330 only at a temperature of up to –40°C. In order to meet the impact toughness requirements of SP.16.13330 for welded joints of steel 09G2S (9MnSi5) in each specific case, it is necessary to select appropriately the temperature-and-time parameters of high-frequency welding and of post-welding heat treatment and to specify them in SP.25.13330.</p>

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Effect of Heat Treatment on Service Properties of Near-Weld Zone of Steel 09G2S (9MnSi5) at Negative Temperatures

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • S. A. Yalygin,
  • N. O. Shaposhnikov,
  • B. S. Ermakov,
  • O. V. Shvetsov,
  • D. V. Nechaev

摘要

The effect of heat treatment modes under production and laboratory conditions on the microstructure, impact toughness and microhardness of welded joints of steel 09G2S (9MnSi5) at negative temperatures is studied experimentally. It is shown that simulation of normalizing under laboratory conditions ensures the impact toughness values meeting the requirements of the SP.16.13330 Standard at a temperature of up to –60°C. The heat treatment modes used in the production provide an impact toughness meeting the requirements of SP.16.13330 only at a temperature of up to –40°C. In order to meet the impact toughness requirements of SP.16.13330 for welded joints of steel 09G2S (9MnSi5) in each specific case, it is necessary to select appropriately the temperature-and-time parameters of high-frequency welding and of post-welding heat treatment and to specify them in SP.25.13330.