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Tension Tests Behavior of API 5L X60 Pipeline Steel in a Simulated Soil Solution to Evaluate SCC Susceptibility

Published online by Cambridge University Press:  20 December 2012

A. Contreras ,
S. L. Hernández ,
R. Galvan-Martinez  and
O. Vega-Becerra
A. Contreras*
Affiliation:
Instituto Mexicano del Petroleó, Eje Central Lázaro Cárdenas Norte 152, Col. San Bartolo Atepehuacan, C.P. 07730, México.
S. L. Hernández
Affiliation:
Instituto Mexicano del Petroleó, Eje Central Lázaro Cárdenas Norte 152, Col. San Bartolo Atepehuacan, C.P. 07730, México.
R. Galvan-Martinez
Affiliation:
Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Ave. S.S Juan Pablo II S/N, Ciudad Universitaria, Fracc. Costa Verde, Veracruz, C.P. 94294, México.
O. Vega-Becerra
Affiliation:
Centro de Investigación en Materiales Avanzados, S.C. Unidad Monterrey Alianza Norte 202. Parque de Investigación e Innovación Tecnológica. Apodaca, Nuevo León, C.P. 66600, México.
*
*Email: acontrer@imp.mx
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Abstract

In this work slow strain rate tests (SSRT) were used for the evaluation of API 5L X60 in contact with a simulated soil solution called NS4 in order to evaluate stress corrosion cracking (SCC) susceptibility. SSRT were carried out in NS4 solution at room temperature to simulate dilute ground water that has been found to be associated with SCC of low carbon steel pipelines. A strain rate of 1x10-6 sec-1 was used. According to the analysis of SSRT results, the X60 pipeline steel is highly resistant to SCC at the conditions studied. A combine fracture type it was observed: ductile and brittle with a transgranular appearance. Some pits close to the fracture zone were observed. The failure process and mechanism of X60 steel in NS4 solution are controlled by anodic dissolution and hydrogen embrittlement which was revealed with the internal cracks observed in the surface fracture. There is a relation between the strength of the steel and the SCC susceptibility, thus, increasing strength in the steel, the SCC susceptibility increases as a function of the pH solution used.

Keywords

corrosionsteelfracture
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1481: Symposium 2D – Structural and Chemical Characterization of Metals, Alloys and Compounds—2012 , 2012 , pp. 71 - 80
Copyright
Copyright © Materials Research Society 2012

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