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Rock Mechanics Symposium and 5th U. It is also well understood that different test methods may not necessarily provide the same ranking. This is the reason why replicate testing is advisable to tighten as much as possible the scattering of the SSC threshold.
Nevertheless, SSC test results can show statistical variability for the same material. The aim of this paper is to check whether the applied stresses are uniformly distributed within the tensile specimen.
Shared data regarding the presence of bending phenomenon are compared when stressing test specimen instrumented with strain gages. Order of magnitude is also quantified on different test equipment. Discussion on the influence of other parameters such as machining, polishing, storage of the specimens and test procedure is presented as well in order to share the experience on the NACE Method A test.
SSC phenomenon may occur in materials subjected to stress applied or residual in a hydrogen sulfide H2S containing environment. Method A tensile test consists of uniaxial stressing of specimen up to a specified stress level below the Yield Strength. Several types of stressing frames may be used to perform the test, but this paper will only focus on tests carried out with proof ring as stressing frame.
The sour service environment consists of chloride containing solution saturated with H2S gas. A testing device is presented in Figure 1.
When multiple specimens are tested at various stress levels, an apparent threshold stress level for the occurrence of SSC can be obtained. Some factors were identified as influencing Method A test results and are presented in the first part of this paper. The second and third parts of this study are devoted to bending assessment in tensile test specimen stressed using proof rings.
An inventory of every factor which is likely to affect the Method A test results is presented on Figure 2. Some of them were spotted as critical factors towards SSC test result dispersion.
It does not give acceptance levels or pass:fail criteria. It covers solution chemistries, solution volume: surface area ratio, test duration, specimen geometry and loading, amongst other testing details for the four different methods, see below. Dead weight, proof ring or hydraulic loading may be applied. The specimens are fully machined and, because of the waisted geometry, cannot sample weld surface details or near surface microstructures.
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Log in to your subscription Username. Peer reviewed only Published between: Published from year: and Published to year: Advanced search Show search help. Rock Mechanics Symposium and 5th U. It is also well understood that different test methods may not necessarily provide the same ranking.
NACE TM0177 – Sour test methods
Testing of metals subjected to tensile stresses for resistance to cracking failure in low-pH aqueous environments containing hydrogen sulfide H2S. Covers sulfide stress cracking and stress corrosion cracking. Personal menu. Available for download.