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<p>The authors studied the microstructure and mechanical properties of welded 34 mm joints of cold-resistant microalloyed heavy plate steel P460NL1 (specification EN 10028–3:2019), intended for use in high-pressure vessels, including mobile CO<sub>2</sub> storage tanks. The V‑groove welds were obtained by automatic submerged arc welding (process SAW 121–2) with heat input of 1.5±0.1 kJ/mm. The microstructural transformation patterns in the heat-affected zone (HAZ) and weld metal were analyzed, along with microhardness, and impact energy was determined at sub-zero temperatures. The steel weldability under controlled thermal severity (CTS) was examined, and a&#xa0;bead-on-plate (BoP) test was performed. In addition, aging tests were conducted to assess the effect of the base metal on impact toughness, and high-temperature tensile tests in the temperature range of 50–450 °C were performed to evaluate the level of strength characteristics of the base metal over a&#xa0;wide range of operating temperatures.</p>

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Studying the quality of the welded joints of cold-resistant microalloyed heavy plate steel P460NL1 intended for mobile CO2 storage applications

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • E. A. Goli-Oglu,
  • A. N. Filatov

摘要

The authors studied the microstructure and mechanical properties of welded 34 mm joints of cold-resistant microalloyed heavy plate steel P460NL1 (specification EN 10028–3:2019), intended for use in high-pressure vessels, including mobile CO2 storage tanks. The V‑groove welds were obtained by automatic submerged arc welding (process SAW 121–2) with heat input of 1.5±0.1 kJ/mm. The microstructural transformation patterns in the heat-affected zone (HAZ) and weld metal were analyzed, along with microhardness, and impact energy was determined at sub-zero temperatures. The steel weldability under controlled thermal severity (CTS) was examined, and a bead-on-plate (BoP) test was performed. In addition, aging tests were conducted to assess the effect of the base metal on impact toughness, and high-temperature tensile tests in the temperature range of 50–450 °C were performed to evaluate the level of strength characteristics of the base metal over a wide range of operating temperatures.