Structural strength failure mechanism of X52 natural gas pipeline with corrosion defects under hydrogen-blended environment

Table 1. Yield strength and tensile strength of X52 steel for different hydrogen blending ratios
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Table 1. Yield strength and tensile strength of X52 steel for different hydrogen blending ratios
掺氢比例/% 屈服强度${\sigma _{\rm{s}}}$/MPa 抗拉强度${\sigma _{\mathrm{y}}}$/MPa
0 393 508
2.5 381 515
12.5 388 519
25.0 390 509
50.0 368 492

Table 2. Elastic modulus of X52 steel for different hydrogen blending ratios
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Table 2. Elastic modulus of X52 steel for different hydrogen blending ratios
掺氢比例/% 弹性模量E/MPa
0 196 500
2.5 190 500
12.5 194 000
25.0 195 000
50.0 184 000

Table 3. Mesh independence verification
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Table 3. Mesh independence verification
网格方案网格尺寸/mm 网格数量/个缺陷处最大应力/MPa
低密度 4×8 8 000 308
中密度 4×4 16 000 316
高密度 2×2 32 000 313

Table 4. Maximum stress of defect zone at different depths
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Table 4. Maximum stress of defect zone at different depths
缺陷相对深度d/t 缺陷处最大应力/MPa
0.15 265.8
0.30 316.5
0.45 377.0
0.60 397.3

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Yu CAO, Peng CHEN, Jiangong YANG, Deqiang WANG, Yong BAI. Structural strength failure mechanism of X52 natural gas pipeline with corrosion defects under hydrogen-blended environment[J]. Chinese Journal of Ship Research, 2024, 19(4): 186

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