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<p>In this study, the microstructure and mechanical properties of 16MnNiV small-diameter seamless steel tubes during cold drawing and heat treatment processes is systematically analyzed. The results demonstrate that 16MnNiV small-diameter seamless steel tubes are successfully prepared, achieving tensile strengths of 926 MPa, yield strengths of 842 MPa, and elongations of 16%, meeting the specified mechanical property targets of tensile strength ≥ 910 MPa, yield strength ≥ 820 MPa, and elongation ≥ 15%. The analysis indicates that during the cold drawing process, there is refinement of the ferrite grain size, spheroidization of the pearlite, and the formation of a &lt;110&gt; fiber texture. Stress-relief annealing further promotes the spheroidization of the pearlite but has minimal impact on the ferrite grain size and the &lt;110&gt; fiber texture. Calculations indicate that the enhancement in yield strength is mainly attributed to grain boundary strengthening (234.6 ~ 409.9 MPa) induced by cold drawing. The face-centered cubic (FCC) vanadium carbides (VC) are the sole precipitate phase within the tubes. Calculations show that, in this process, they contribute a strengthening increment of 71.4 to 78.4 MPa. Additionally, the solid solution strengthening increment in this process is 128.6 to 142.3 MPa, while the dislocation strengthening increment is 20.6 to 120.7 MPa.</p>

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Evolution of Microstructure and Properties of 16MnNiV Small-Diameter Seamless Steel Tubes in Cold Drawing and Heat Treatment Processes

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Chunhui Jiang,
  • Han Li,
  • Zhaodong Li,
  • Wei Wei,
  • Yanguang Cao,
  • Chao Zhang

摘要

In this study, the microstructure and mechanical properties of 16MnNiV small-diameter seamless steel tubes during cold drawing and heat treatment processes is systematically analyzed. The results demonstrate that 16MnNiV small-diameter seamless steel tubes are successfully prepared, achieving tensile strengths of 926 MPa, yield strengths of 842 MPa, and elongations of 16%, meeting the specified mechanical property targets of tensile strength ≥ 910 MPa, yield strength ≥ 820 MPa, and elongation ≥ 15%. The analysis indicates that during the cold drawing process, there is refinement of the ferrite grain size, spheroidization of the pearlite, and the formation of a <110> fiber texture. Stress-relief annealing further promotes the spheroidization of the pearlite but has minimal impact on the ferrite grain size and the <110> fiber texture. Calculations indicate that the enhancement in yield strength is mainly attributed to grain boundary strengthening (234.6 ~ 409.9 MPa) induced by cold drawing. The face-centered cubic (FCC) vanadium carbides (VC) are the sole precipitate phase within the tubes. Calculations show that, in this process, they contribute a strengthening increment of 71.4 to 78.4 MPa. Additionally, the solid solution strengthening increment in this process is 128.6 to 142.3 MPa, while the dislocation strengthening increment is 20.6 to 120.7 MPa.