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<p>Aiming to mitigate joint leakage in shell-and-tube heat exchangers caused by corrosion, vibration, and residual stress, a novel high-temperature multi-directional asynchronous rolling process is proposed to overcome the limitations of conventional stainless-steel cladding methods. A 3D thermo-mechanical coupling model of 316L/15Mn composite tube plate has been developed to systematically investigate the effects of rolling direction (120°, 90°, and 45°) on forming behavior and properties, and the results indicate that the 90° rolling direction yields the most stable rolling force, with a maximum of 194.5 kN (41.1% lower than 120°), while avoiding the high cost associated with excessive passes at 45°. Decreasing the rolling direction angle reduces equivalent stress, with the lowest value observed at 45° (597&#xa0;MPa). All composite tube plate interfaces remain under compressive stress (≥&#xa0;55&#xa0;MPa), ensuring adequate bonding strength. Furthermore, the 90° condition achieves optimal plate shape with minimal warpage (167.29°), along with significant grain size refinement (18.5&#xa0;<i>μ</i>m and 15.2&#xa0;<i>μ</i>m at key interfaces). Overall, this process improves interfacial bonding, plate shape accuracy, and microstructural uniformity, providing an effective strategy for high-performance composite tube plate fabrication.</p>

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Study on the Multi-directional Asynchronous Rolling Process and Properties of 316L/15Mn Composite Tube Plates

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Fangkun Ning,
  • Tianbing Shi,
  • Shuping Kong,
  • Weitao Jia,
  • Lifeng Ma

摘要

Aiming to mitigate joint leakage in shell-and-tube heat exchangers caused by corrosion, vibration, and residual stress, a novel high-temperature multi-directional asynchronous rolling process is proposed to overcome the limitations of conventional stainless-steel cladding methods. A 3D thermo-mechanical coupling model of 316L/15Mn composite tube plate has been developed to systematically investigate the effects of rolling direction (120°, 90°, and 45°) on forming behavior and properties, and the results indicate that the 90° rolling direction yields the most stable rolling force, with a maximum of 194.5 kN (41.1% lower than 120°), while avoiding the high cost associated with excessive passes at 45°. Decreasing the rolling direction angle reduces equivalent stress, with the lowest value observed at 45° (597 MPa). All composite tube plate interfaces remain under compressive stress (≥ 55 MPa), ensuring adequate bonding strength. Furthermore, the 90° condition achieves optimal plate shape with minimal warpage (167.29°), along with significant grain size refinement (18.5 μm and 15.2 μm at key interfaces). Overall, this process improves interfacial bonding, plate shape accuracy, and microstructural uniformity, providing an effective strategy for high-performance composite tube plate fabrication.