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Role of Nonmetallic Inclusions in Premature Stress-Corrosion Fractures of Drill Pipes

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We analyze the causes of the in-service loss of integrity of drill pipes made of G105 steel connected with their premature stress-corrosion fractures. In this case, the mechanical characteristics of steel are satisfactory, except a somewhat lowered elongation. At the same time, both in the structure and on the fracture surfaces of impact test specimens, we reveal a large number of corrosion-active nonmetallic inclusions of the calcium-aluminate type, which may increase the rate of local corrosion by an order of magnitude, promote the formation of deep pits on the inner surface of the pipe, and play the role of sites of initiation of corrosion-fatigue cracks. This is why we assume that the stage of crack initiation, which mainly determines the total durability of drill pipes after premature failures is controlled by the presence of corrosion-active nonmetallic inclusions and their density in the structure of steel.

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Authors and Affiliations

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

    E. І. Kryzhanivskyi & І. І. Chudyk

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

    H. М. Nykyforchyn, О. Z. Student & H. V. Krechkovska

Authors
  1. E. І. Kryzhanivskyi
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  2. H. М. Nykyforchyn
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  3. О. Z. Student
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  4. H. V. Krechkovska
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  5. І. І. Chudyk
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Correspondence to О. Z. Student.

Additional information

Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 55, No. 6, pp. 41–48, November–December, 2019.

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Kryzhanivskyi, E.І., Nykyforchyn, H.М., Student, О.Z. et al. Role of Nonmetallic Inclusions in Premature Stress-Corrosion Fractures of Drill Pipes. Mater Sci 55, 822–830 (2020). https://doi.org/10.1007/s11003-020-00375-4

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  • DOI: https://doi.org/10.1007/s11003-020-00375-4

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