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Corrosion-Fatigue Crack Propagation in Exploited Pump Rods Made of 20N2M Steel

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We analyze the influence of model stratal water with low acidity on the cyclic crack resistance of 20N2M steel of a pump rod after operation for 5.5 yr. The state of the metal of a pump rod head is conventionally regarded as the reference state. We revealed insignificant differences between the basic mechanical properties and the characteristics of cyclic crack-growth resistance of steel in air for different states of the material. However, under the action of corrosive media, the fatigue crack-growth rate for the exploited steel is much higher than for steel in the reference state. This means that the in-service degradation of the rod steel manifests itself mainly in its sensitivity to the action of corrosive media.

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Authors and Affiliations

  1. Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine

    N. V. Kret & L. M. Svirska

  2. Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine

    T. P. Venhrynyuk

Authors
  1. N. V. Kret
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  2. L. M. Svirska
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  3. T. P. Venhrynyuk
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Correspondence to N. V. Kret.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 56, No. 2, pp. 130–134, March–April, 2020.

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Kret, N.V., Svirska, L.M. & Venhrynyuk, T.P. Corrosion-Fatigue Crack Propagation in Exploited Pump Rods Made of 20N2M Steel. Mater Sci 56, 279–283 (2020). https://doi.org/10.1007/s11003-020-00426-w

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  • DOI: https://doi.org/10.1007/s11003-020-00426-w

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