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


Other title
proof ring
Sulfide stress cracking
casing steels
carbide morphology
inclusion content and morphology
sour environments
Type of item
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 of Chemical and Materials Engineering
Chemical Engineering
Date accepted
Graduation date
Master of Science
Degree level
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.
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