Influence of incomplete loading of gas transport systems on the fatigue crack growth resistance of long-term operated 17G1S pipe steel

Keywords

17G1S steels, cyclic crack growth resistance, incomplete loading, long-term operation, corrosion fatigue, stress ratio, loading frequency.

Cite as

Petryna D. Yu. and Gleb A. T. Influence of incomplete loading of gas transport systems on the fatigue crack growth resistance of long-term operated17G1S pipe steel. Physicochemical Mechanics of Materials. 2026. 62(2), 134-141.

https://doi.org/10.15407/pcmm2026.02.134

Abstract

The influence of incomplete loading modes of main gas pipelines on the indicators of cyclic crack growth resistance of 17G1S steel after long-term operation (over 35 years) is investigated. It is established that the gas pipeline operation at the reduced average pressure is accompanied by an increase in the dynamic component of the load, which radically changes the mechanism of fatigue crack growth. It is experimentally proved that the combination of microstructure degradation (“working aging”) and specific load parameters under incomplete loading leads to a significant decrease in the thresholds of cyclic crack growth resistance. A synergistic effect is revealed, in which the simul¬taneous action of low-frequency cycles and an aggressive environment accelerates the fracture of steel compared to the design operating modes. The obtained results can be used to refine the methods for calculating the residual lifetime of pipelines when changing the technological conditions of their operation.

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