Mechanical and metallurgical effects on low-pH stress corrosion cracking of natural gas pipelines
Book
·
OSTI ID:128657
- Cortest Columbus Technologies, Inc., Columbus, OH (United States)
Stress corrosion cracking of natural gas pipelines in low-pH environments is a serious problem for the gas transmission industry. This paper describes results of an ongoing research program investigating crack growth of API X-65 and X-52 line pipe steels in a low-pH cracking environment using a J-integral technique. The overall objective of the work is to estimate crack growth rates on operating pipelines. In previous work, it was demonstrated that the technique could be utilized to reproduce the cracking observed in the field and that the J integral is a good parameter for characterizing crack growth behavior. Recent work has focused on the evaluation of the influence of loading parameters, such as displacement rate, and metallurgy, on crack growth. Testing has also been performed in which loading sequences involved: (a) a constant displacement rate, until cracking was detected, followed by maintaining a constant displacement; and, (b) slowly loading a specimen to fifty percent of its tensile strength in an inert, non-aqueous environment followed by loading in the low-pH environment.
- OSTI ID:
- 128657
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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