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Type: Journal article
Title: Microstructural, mechanical, texture and residual stress characterizations of X52 pipeline steel
Author: Lavigne, O.
Kotooussov, A.
Luzin, V.
Citation: Metals, 2017; 7(8):306-1-306-10
Publisher: MDPI AG
Issue Date: 2017
ISSN: 2075-4701
Statement of
Olivier Lavigne, Andrei Kotousov and Vladimir Luzin
Abstract: In this paper, the microstructural and mechanical properties of a high-strength low-alloy (HSLA) API 5L X52 steel, which is widely utilized in the construction of gas pipelines, were characterized with optical microscopy, electron backscatter diffraction, and standard mechanical tests. The outcomes of these characterizations were used to evaluate the strengthening contributions of the solid solution, grain size, dislocations, and precipitates to the overall strength of the steel. In addition, texture and residual stresses were determined with neutron diffraction. The residual stresses were found to be low in comparison with the expected stresses due to the operating pressure. However, these stresses could contribute to the initiation and propagation of stress corrosion cracking at the outer surface of the pipe. Neutron diffraction results also suggested that the outer surface of the pipe had a texture that is expected to have a low resistance to high pH stress corrosion cracking. Both conclusions were found to be consistent with field observations.
Keywords: HSLA steel; API X52; gas pipeline; microstructure; neutron diffraction; strength; stress corrosion cracking
Rights: © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
DOI: 10.3390/met7080306
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