Corrosion Protection of Materials

Stress-Corrosion Cracking of Welded Joint of X70 Steel with Concentrator in Weld

Yuriy Lisovskiy1, Nyrkova Lyudmila1, Lisovyi Pavlo2, Onishchenko Vladislav2

1. E.O. Paton Electric Welding Institute of NAS of Ukraine
2. Scientific and technical complex «E.O. Paton Electric Welding institute»
of NAS of Ukraine

https://doi.org/10.15407/msse2025.01.156

PDF DocumentPDF

Keywords

stress-corrosion cracking, weld, properties, deformation, fracture

Abstract

Numerical modeling using finite element method showed that stress-corrosion cracking of the welded joint with a V-shaped stress occurs along the weld, without spreading through heat-affected zone and parent metal, which emphasizes high ductility properties of the weld. Maximum deformation is concentrated under the notch, where the fracture focus is formed.

References

  1. Adeleke A.H., Luo J.L., Ivey D.G. Stress corrosion cracking behaviour in welded X-70 line pipe steel under near-neutral pH conditions // In: Chen W. (ed.). Proceedings of the 44th Annual Conference of Metallurgists of CIM: Pipelines for the 21st Century. – Edmonton, 2005. – 365–367 p.
  2. Sun Q.L., Shao W.W., Wang X.G., Wang C.B. Influence of fluctuation frequency on stress corrosion cracking of X70 pipeline steel welding joint // Adv. Mater. Res. – 2013. – 690–693. – P. 2668–2672. https://doi.org/10.4028­/www.scientific.net/AMR.690-693.2668
  3. Martins F.A., Ponciano J.A., Bott I.S. SAW welded joints of two API steels subject to SCC laboratory testing // Mater. Forum. – 2007. – 539–543. – P. 4440–4445. https://doi.org/10.4028/www.scientific.net/MSF.539-543.4440
  4. Nyrkova L., Goncharenko L., Lisovskiy Y., Faynberg L., Kostin V. Resistance of the welded joint of X70 steel for main gas pipelines against corrosion-mechanical cracking under cathodic polarization in near-neutral pH solutions // Corrosion. – 2024. – 80(11). – P. 1098–1108. http://dx.doi.org/10.5006/4615