Page 112 - 机械工程材料2025年第三期

牛化昶，等：不同含氢环境下X80管线钢的慢应变速率拉伸性能

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pipelines［M］. Hoboken，New Jersey，USA：Wiley， 104：471-479.

Slow Strain Rate Tensile Properties of X80 Pipeline Steel in Different Hydrogen-
Containing Environments

NIU Huachang , LI Yi , SONG Weichen , LYU Jiahua 2
1
2
2
(1. Shandong Natural Gas Pipeline Co., Ltd., Jinan 250101, China; 2. SINOPEC Petroleum Engineering Corporation，
Dongying 257026, China)
Abstract: Slow strain rate tensile tests were carried out on base metal axial and circumferential specimens and
weld specimens of X80 pipeline steel in 12 MPa high pressure environment with gas composition (volume fraction) of
2% H 2 +2% CO 2 +N 2 (2% hydrogen environment), 5% H 2 +2% CO 2 +N 2 (5% hydrogen environment) and 100%
N 2 (hydrogen-free environment). The tensile properties of specimens in different environments were studied, and the
hydrogen embrittlement sensitivity of base metal and weld was evaluated based on the percentage reduction of area. The
results show that compared with those in the hydrogen-fee environment, the percentage elongation after fracture of the
base metal axial specimen in 2% hydrogen environment and 5% hydrogen environment decreased by about 1% and 5%,
of the base metal circumferential specimen decreased by about 7% and 11%, and of the weld decreased by about 7% and
12%, respectively. The plasticity deterioration degree of the weld was greater than that of the base metal, with a greater
degradation in the 5% hydrogen environment. The tensile strengths of base metal and weld in 2% and 5% hydrogen
environments were basically similar. In the same hydrogen-containing environment, the tensile strength of the base metal
circumferential specimen was higher than that of the axial specimen, and the tensile strength of the weld was the lowest;
the plasticity of the base metal axial specimen was better than that of the radial specimen, and the plasticity of the weld
was the worst. The hydrogen embrittlement sensitivities of base metal and weld in 2% hydrogen environment were lower
than that in 5% hydrogen environment. The hydrogen embrittlement sensitivity of weld was the largest, followed by base
metal circumferential specimen and axial specimen in the same hydrogen-containing environment.
Key words: X80 pipeline steel; hydrogen-containing environment; slow strain rate tension; percentage elongation
after fracture; hydrogen embrittlement sensitivity

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