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Updated: Jun 13, 2026
10:24
Applicability Analysis of Assessment Methods for Morphological Parameters of Corroded Steel Bars
Published on: November 1, 2018
Study on Residual Strength of Pipelines with Single-Point Uniform Corrosion Defects Under Internal Pressure Loading.
Lihua Chen1,2, Guoxing Yu3, Die Liu2
1School of Civil Engineering, Chongqing Vocational Institute of Engineering, Chongqing 402260, China.
Materials (Basel, Switzerland)
|June 12, 2026
Summary
Corrosion depth significantly impacts pipeline failure pressure, with a critical threshold at 0.6 relative depth. A new predictive model offers accurate residual strength assessment for oil and gas pipelines.
Area of Science:
- Materials Science and Engineering
- Mechanical Engineering
- Civil Engineering
Background:
- Pipeline integrity is vital for energy security, but internal corrosion defects pose significant risks.
- Accurate assessment of residual strength in corroded pipelines is crucial for maintenance and safety.
Purpose of the Study:
- To investigate the influence of corrosion defect geometry on the failure pressure of X52, X65, and X80 steel pipelines.
- To develop a high-precision predictive model for the residual strength of corroded pipelines.
Main Methods:
- Development of a 3D finite element model for uniform corrosion defects, incorporating nonlinear material behavior.
- Validation of the finite element model against full-scale burst experiment data.
- Parametric analysis of corrosion depth, length, and width effects on pipeline failure pressure.
Main Results:
- Corrosion depth is the dominant factor, with a drastic drop in load-bearing capacity when relative depth exceeds 0.6.
- Corrosion length has a critical impact threshold, after which its effect plateaus.
- Corrosion width has a negligible influence within typical engineering ranges (20-100°).
Conclusions:
- The developed predictive model demonstrates higher accuracy and broader applicability than conventional methods (ASME B31G, DNV RP-F101).
- The findings provide engineers with a practical tool for rapid and accurate residual strength evaluation of corroded pipelines.
- Understanding defect geometry's influence is key to ensuring long-term pipeline operational safety and extending service life.
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