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Permanent link (DOI): https://doi.org/10.7939/R39D62

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Sulfide Stress Cracking Susceptibility of Low Alloy Steels for Casing Application in Sour Environments Open Access

Descriptions

Other title
Subject/Keyword
SSC
proof ring
SSRT
Sulfide stress cracking
casing steels
carbide morphology
inclusion content and morphology
sour environments
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Huang, Weishan
Supervisor and department
Henein, Hani (Chemical and Materials Engineering)
Luo, Jingli (Chemical and Materials Engineering)
Examining committee member and department
Adeeb, Samer (Civil and Environmental Engineering)
Henein, Hani (Chemical and Materials Engineering)
Luo, Jingli (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2012-09-12T14:13:33Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
Sulfide stress cracking (SSC) resistance of casing steels with different alloying chemistries (i.e. Ti-B and Mn-Cr-Mo) was evaluated using constant load tensile test and slow strain rate test in NACE-TM0177 environment. SSC resistance in terms of RAH2S/RAair and time to failure was found to decrease with increase of material strength. For more susceptible steels, a mix mode of transgranular and intergranular fracture was observed. For less susceptible steels, intergranular fracture was less prevalent. Inclusions were found to be the dominant factor contributing to SSC susceptibility. Mn-Cr-Mo steels were more susceptible to inclusions than Ti-B steels. Cracking was found to be initiated mainly from elongated inclusions such as MnS, Al-Si-O, or large globular Ca-enriched oxide inclusions. Clustering of inclusions were main SSC initiation sites. The distribution and morphology of carbides played an important role in SSC propagation. A uniform microstructure with fine globular carbides was found to improve SSC resistance.
Language
English
DOI
doi:10.7939/R39D62
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: 2.1 Sour service
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