The Influence of Service Life and Corrosive Environment on the Crack Growth Resistance of the Welded Joints of Pipe Steel

Authors

  • Ben Nengjun Anhui University of Technology, China and Yancheng Polytechnic College, China
  • Oleg Vytyaz Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine
  • Yurii Nespliak Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine
  • Serhii Kravchuk Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine
  • Roman Hrabovs'kyi Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

DOI:

https://doi.org/10.7546/CRABS.2025.08.12

Keywords:

gas main pipelines, welded joints, low-alloy carbon steel, corrosive environment, cyclic loading, fatigue crack, corrosion-fatigue crack, crack growth rate, stress intensity factor

Abstract

This paper presents investigation results of the service life and the corrosive environment influence on the crack growth resistance of welded joints in X60 API 5L pipe steel, commonly used in gas main pipelines. Using the fracture mechanics approaches, which are sensitive to the influence of the different operational factors in the material, the crack growth resistance in the base metal, heat-affected zone (HAZ), and metal weld was established and compared. It was found that the material of the HAZ has the lowest fatigue and corrosion-fatigue fracture resistance. Degradation changes in the steel enhance this tendency. Comparative studies were carried out in air and in the NS4 solution simulating neutral underground water.

Author Biographies

Ben Nengjun, Anhui University of Technology, China and Yancheng Polytechnic College, China

Mailing Address:
School of Materials Science and Engineering,
Anhui University of Technology,
Maanshan 243002, PR China
and
School of Intelligent Manufacturing,
Yancheng Polytechnic College,
Yancheng 224005, PR China

E-mail: beneric@126.com

Oleg Vytyaz, Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

Mailing Address:
Institute of Petroleum Engineering,
Ivano-Frankivsk National Technical University of Oil and Gas,
15 Karpatska St, Ivano-Frankivsk, Ukraine, 76019

E-mail: o.vytyaz@gmail.com

Yurii Nespliak, Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

Mailing Address:
Institute of Petroleum Engineering,
Ivano-Frankivsk National Technical University of Oil and Gas,
15 Karpatska St, Ivano-Frankivsk, Ukraine, 76019

E-mail: y.nespliak@gaz.net.ua

Serhii Kravchuk, Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

Mailing Address:
Institute of Petroleum Engineering,
Ivano-Frankivsk National Technical University of Oil and Gas,
15 Karpatska St, Ivano-Frankivsk, Ukraine, 76019

E-mail: sergio4555@gmail.com

Roman Hrabovs'kyi, Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

Mailing Address:
Institute of Petroleum Engineering,
Ivano-Frankivsk National Technical University of Oil and Gas,
15 Karpatska St, Ivano-Frankivsk, Ukraine, 76019

E-mail: hrabovskyyr@gmail.com

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Published

25-08-2025

How to Cite

[1]
B. Nengjun, O. Vytyaz, Y. Nespliak, S. Kravchuk, and R. Hrabovs’kyi, “The Influence of Service Life and Corrosive Environment on the Crack Growth Resistance of the Welded Joints of Pipe Steel”, C. R. Acad. Bulg. Sci., vol. 78, no. 8, pp. 1215–1223, Aug. 2025.

Issue

Vol. 78 No. 8 (2025)

Section

Engineering Sciences

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