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VACUUM ›› 2025, Vol. 62 ›› Issue (3): 15-20.doi: 10.13385/j.cnki.vacuum.2025.03.03

• Vacuum Metallurgy and Thermal Engineering • Previous Articles     Next Articles

Effect of Annealing Treatment on TCP Phase Precipitation in a Super Ferritic Stainless Steel Tube

MENG Tao1, ZHENG Shihao2, LIU Enze3, TAN Zheng3, NING Likui3   

  1. 1. Navy Equipment Department, Xi'an 710021, China;
    2. China Petroleum and Chemical Corporation Luoyang Branch, Luoyang 471000, China;
    3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2024-12-03 Online:2025-05-25 Published:2025-05-23

Abstract: The effect of annealing process on the TCP phase precipitation in the microstructure of cold-rolled 29Cr-4Mo-TiNb super ferritic stainless steel pipe was studied by optical microscope (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results indicate that the inclusions in 29Cr-4Mo-TiNb steel predominantly consist of composite Al2O3·TiN·Nb(C,N). Within the temperature range of 850-950 ℃, Laves phases begin to precipitate after just 2 minutes of holding time, the initial precipitation of Laves phases promotes the subsequent formation of σ phases. The amount of σ phase precipitated increases with longer holding times but decreases with higher annealing temperatures. When the annealing temperature is raised to 1 000 ℃, no Laves or σ phases are observed throughout the entire 30-minute holding period.

Key words: 29Cr-4Mo-TiNb steel, super ferritic stainless steel, vacuum induction melting, Laves phase, σphase

CLC Number:  TG142.71

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