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<p>Low-nickel high-nitrogen austenitic stainless steel is susceptible to N loss during the welding process, which diminishes its tensile strength and compromises the reliability of the equipment. Although the use of rich-Cr stainless steel welding wire can ensure the corrosion resistance of the welded joint to a certain extent, it cannot guarantee the plasticity; and the use of rich-Mn welding wire for welding cannot guarantee the plasticity of the welded joint even if it can significantly improve the strength of the welded joint. In order to obtain a welded joint with coordinated optimization of strength, plasticity and corrosion resistance, and to ensure the safe service of the welded joint of low-nickel austenitic stainless steel, Ni-Cr-Mo alloy welding wire without N element was developed and designed as filler metal. Metal Active Gas welding (MAG) of low-nickel high-nitrogen austenitic stainless steel was carried out with different heat input and 8%N<sub>2</sub> + 92%Ar shielding gas. The results show that with the increase of heat input, the secondary dendrite spacing in the welded metal (WM) is 2.52&#xa0;μm, 5.55&#xa0;μm and 6.11&#xa0;μm respectively, and the proportion of high-angle grain boundaries in the WM increases from 83.4 to 85.7%. Meanwhile, with the increase of heat input, the tensile strength and hardness of welded joints increase, and the corrosion potential of welded joints decreases slightly. When the welding heat input is controlled at 7.5&#xa0;KJ/cm, the strength, plasticity and corrosion resistance of the welded joint can be in a coordinated and consistent manner, which provides technical support for the safe service of the welded joint.</p>

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Strength, Plasticity, and Corrosion Resistance of Low-Nickel Austenitic Stainless Steel Welded Joints are Coordinated and Optimized

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Naiwen Fang,
  • Zhiqiang Feng,
  • Pengbo Wu,
  • Chunhuan Guo,
  • Wei Li,
  • Xingxing Wang,
  • Laizhu Jiang,
  • Jiutian Luo,
  • Quan Li,
  • Dongshanyu Niu,
  • Xin Li

摘要

Low-nickel high-nitrogen austenitic stainless steel is susceptible to N loss during the welding process, which diminishes its tensile strength and compromises the reliability of the equipment. Although the use of rich-Cr stainless steel welding wire can ensure the corrosion resistance of the welded joint to a certain extent, it cannot guarantee the plasticity; and the use of rich-Mn welding wire for welding cannot guarantee the plasticity of the welded joint even if it can significantly improve the strength of the welded joint. In order to obtain a welded joint with coordinated optimization of strength, plasticity and corrosion resistance, and to ensure the safe service of the welded joint of low-nickel austenitic stainless steel, Ni-Cr-Mo alloy welding wire without N element was developed and designed as filler metal. Metal Active Gas welding (MAG) of low-nickel high-nitrogen austenitic stainless steel was carried out with different heat input and 8%N2 + 92%Ar shielding gas. The results show that with the increase of heat input, the secondary dendrite spacing in the welded metal (WM) is 2.52 μm, 5.55 μm and 6.11 μm respectively, and the proportion of high-angle grain boundaries in the WM increases from 83.4 to 85.7%. Meanwhile, with the increase of heat input, the tensile strength and hardness of welded joints increase, and the corrosion potential of welded joints decreases slightly. When the welding heat input is controlled at 7.5 KJ/cm, the strength, plasticity and corrosion resistance of the welded joint can be in a coordinated and consistent manner, which provides technical support for the safe service of the welded joint.