Influence of niobium precipitates on the hydrogen-induced cracking resistance of X80 pipeline steel

REN Zhenyu; SONG Bo; XU Guofang; CHENG Wensen

doi:10.7513/j.issn.1004-7638.2025.04.022

Volume 46 Issue 4

Aug. 2025

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REN Zhenyu, SONG Bo, XU Guofang, CHENG Wensen. Influence of niobium precipitates on the hydrogen-induced cracking resistance of X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 166-173. doi: 10.7513/j.issn.1004-7638.2025.04.022

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REN Zhenyu, SONG Bo, XU Guofang, CHENG Wensen. Influence of niobium precipitates on the hydrogen-induced cracking resistance of X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 166-173. doi: 10.7513/j.issn.1004-7638.2025.04.022

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Influence of niobium precipitates on the hydrogen-induced cracking resistance of X80 pipeline steel

doi: 10.7513/j.issn.1004-7638.2025.04.022

1.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Anshan Iron and Steel Group Beijing Research Institute Co., Ltd. Iron and Steel Research Branch, Beijing 102209, China

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Received Date: 2024-09-05
Available Online: 2025-08-31
Publish Date: 2025-08-31

Abstract

Abstract

The effects of Nb content on the precipitated phase characteristics, hydrogen diffusion behavior and hydrogen-induced crack resistance (HIC) performance in X80 pipeline steel were studied. The results show that with the increase of Nb content in steel, the number of nanoscale precipitated phases in steel increases from 87 in Nb1 steel with niobium 0.04wt% to 506 in Nb3 steel with niobium 0.12wt%, and the proportion of NbC in steel increases from 64.82% to 98.22% under the same statistical area. The diffusion coefficient of hydrogen atoms in steel decreases from 1.63×10⁻⁶ cm²/s in Nb1 steel to 9.35×10⁻⁷ cm²/s in Nb3 steel. The propagation mode of cracks in steel has changed from the mixing of grain along and through grain in Nb1 steel to the main penetration in Nb2 and Nb3 steels. Nanoscale NbC particles can be used as hydrogen traps to fix diffusible hydrogen atoms in steel, then reduce the aggregation of hydrogen atoms and the initiation of hydrogen-induced cracks in steel. The experimental result indicates that 0.12wt%Nb steel achieves the best resistance to HIC.
- X80 pipeline steel,
- niobium precipitation phase,
- hydrogen diffusion,
- HIC

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References(19)

References

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