Effect of Nb and V on the microstructures and properties of X80 hot pipe steel

AN Tao; LIU Wenyue; LI Tianyi; ZANG Yan; LI Jiangwen; SUN Meihui

doi:10.7513/j.issn.1004-7638.2025.01.025

Volume 46 Issue 1

Feb. 2025

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2025 > 46(1): 178-183

AN Tao, LIU Wenyue, LI Tianyi, ZANG Yan, LI Jiangwen, SUN Meihui. Effect of Nb and V on the microstructures and properties of X80 hot pipe steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(1): 178-183. doi: 10.7513/j.issn.1004-7638.2025.01.025

Citation:

AN Tao, LIU Wenyue, LI Tianyi, ZANG Yan, LI Jiangwen, SUN Meihui. Effect of Nb and V on the microstructures and properties of X80 hot pipe steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(1): 178-183. doi: 10.7513/j.issn.1004-7638.2025.01.025

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Effect of Nb and V on the microstructures and properties of X80 hot pipe steel

doi: 10.7513/j.issn.1004-7638.2025.01.025

AN Tao^{1, 2
,},
LIU Wenyue^{1, 2},
LI Tianyi^{1, 2},
ZANG Yan^{1, 2},
LI Jiangwen^{1, 2},
SUN Meihui^{1, 2}

1.
State Key Laboratory of Metal Materials for Marine Equipment and Application, Anshan 114009, Liaoning, China
2.
Ansteel Beijing Research Institute Co., Ltd., Beijing 102200, China

Received Date: 2023-09-17
Publish Date: 2025-02-27

Abstract

Abstract

In this study, different contents of micro-alloying elements Nb and V were added to X80 pipeline steel. OM, SEM and TEM were used to observe the microstructures and precipitates. Tensile tests and Charpy tests were conducted to obtain the mechanical properties. Thermo-calc software was used for phase transformation calculation. The results showed that after reducing the Nb or V contents in the tested steel, the ratio of solid solution strengthening of the steel decreased; the volume fractions of the nano precipitates increased; the average diameters of the nano precipitates decreased; the ratio of precipitation strengthening of the tested steel increased; and the ratio of grain refinement strengthening of the steel was not obvious. Finally the strength of the tested steel was reduced, while the impact energy at -20 ℃ was significantly increased. This research has confirmed that adding appropriate amounts of 0.02%Nb and 0.04%V elements can improve the strength and toughness matching of materials.
- hot heat bending pipe,
- Nb, V composite microalloying,
- microstructure,
- mechanical properties,
- precipitates

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References(10)

References

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