Resistance against mechanical and corrosion-mechanical failure of welded joint of X70 steel with advanced viscous properties

Editorial Board PCSS Journal; L.I. Nyrkova; L.V. Goncharenko; Yu.I. Lisovskiy; L.I. Faynberg

doi:10.15330/pcss.26.4.794-801

Authors

L.I. Nyrkova E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
L.V. Goncharenko E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Yu.I. Lisovskiy E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
L.I. Faynberg E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine

DOI:

https://doi.org/10.15330/pcss.26.4.794-801

Keywords:

Х70 steel, welded joint, slow strain tests, masometry, voltammetry, optical microscopy, corrosion, stress-corrosion cracking, scanning electron microscopy

Abstract

An arc welding method under flux for the controllable rolling of X70 steel for main gas pipelines, which improves the viscosity of the welded joint and resistance against stress-corrosion cracking (SCC) under cathode protection, was developed. The impact toughness of the weld at temperatures minus 40°C was
KCV^-40 = 189.0 J/cm² versus KCV^-40 = 117.1 J/cm² for the base metal. The corrosion rates and electrochemical properties of different zones of the welded joint were determined, and their stress-corrosion cracking susceptibility in the NS4 medium was investigated using voltammetry, the slow strain rate method, and scanning electron microscopy.

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