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Further improving the comprehensive mechanical propertiesMechanical properties of pipeline steelPipeline steel plays an important role in the construction of pipeline projects, especially under the development trend of large-diameter and high-pressure transmission. In this study, API 5LB pipeline steelPipeline steel has been deep cryogenic treatmentDeep cryogenic treatment (DCT) after traditional hot-rolling process, and the effect of treatment on mechanical propertiesMechanical properties and microstructureMicrostructure were investigated by tensile testTensile test and microstructureMicrostructure inspection. The results show that the DCT can comprehensively improve the strength and plasticity, especially the plasticity. After DCT for 12 h, the yield strength, tensile strength, and total elongation were increased by 4.9%, 4.2%, and 18.7%, respectively. The grain size was gradually refined with the increase of treatment time, which the average grain size was reduced from 15.36 μm to 9.56 μm, with a reduction of 37.76% after DCT for 12 h. The grain refinementGrain refinement after DCT is the main reason for the improvement of the strength and plasticity.

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Enhancing the Microstructure and Mechanical Properties of API 5LB Pipeline Steel Using Deep Cryogenic Treatment

  • 会议论文

  • 发表日期：

    2025年

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  • Yifan Li,
  • Songyuan Ai,
  • Rundong Zhang,
  • Lihua Wan,
  • Mujun Long,
  • Dengfu Chen,
  • Danbin Jia

摘要

Further improving the comprehensive mechanical propertiesMechanical properties of pipeline steelPipeline steel plays an important role in the construction of pipeline projects, especially under the development trend of large-diameter and high-pressure transmission. In this study, API 5LB pipeline steelPipeline steel has been deep cryogenic treatmentDeep cryogenic treatment (DCT) after traditional hot-rolling process, and the effect of treatment on mechanical propertiesMechanical properties and microstructureMicrostructure were investigated by tensile testTensile test and microstructureMicrostructure inspection. The results show that the DCT can comprehensively improve the strength and plasticity, especially the plasticity. After DCT for 12 h, the yield strength, tensile strength, and total elongation were increased by 4.9%, 4.2%, and 18.7%, respectively. The grain size was gradually refined with the increase of treatment time, which the average grain size was reduced from 15.36 μm to 9.56 μm, with a reduction of 37.76% after DCT for 12 h. The grain refinementGrain refinement after DCT is the main reason for the improvement of the strength and plasticity.