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<p>Heavy hot-rolled H-beams are mainly used for the load-bearing and support in high-rise buildings, bridges, subways, offshore oil platforms, liquefied natural gas projects, and offshore wind power equipment. However, the flanges and webs of heavy hot-rolled H-beams are relatively thick. Due to the limitations of the dimensions of continuously cast special-shaped billets, the rolling reduction ratio is restricted, and the conventional thermomechanical controlled processing (TMCP) technology cannot be used during the hot-rolling process to achieve high performance of heavy hot-rolled H-beams. In this paper, aiming at typical heavy hot-rolled H-beams and with the goal of achieving high performance through microstructure refinement, the influence of the interaction of microalloying elements on the precipitation mechanism is proposed. The research results show that the recommended composition range for Ti/Nb microalloy design is 0.008–0.015% Ti, 0.03–0.04% Nb, and 0.0035–0.005% N.</p>

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Microalloying Design of Hot-rolled H-beams

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Meiling Liu,
  • Hengqiang Tang,
  • Wenchao Yan,
  • Lu Han

摘要

Heavy hot-rolled H-beams are mainly used for the load-bearing and support in high-rise buildings, bridges, subways, offshore oil platforms, liquefied natural gas projects, and offshore wind power equipment. However, the flanges and webs of heavy hot-rolled H-beams are relatively thick. Due to the limitations of the dimensions of continuously cast special-shaped billets, the rolling reduction ratio is restricted, and the conventional thermomechanical controlled processing (TMCP) technology cannot be used during the hot-rolling process to achieve high performance of heavy hot-rolled H-beams. In this paper, aiming at typical heavy hot-rolled H-beams and with the goal of achieving high performance through microstructure refinement, the influence of the interaction of microalloying elements on the precipitation mechanism is proposed. The research results show that the recommended composition range for Ti/Nb microalloy design is 0.008–0.015% Ti, 0.03–0.04% Nb, and 0.0035–0.005% N.