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Slow strain rate testing (SSRT) has been evaluated by the oil and gas industry for investigating anodic chloride/sulfide stress corrosion cracking (SCC). It is used not only as a method of screening nickel-base corrosion resistant alloys (CRA) for downhole use, but also as a quality control test. In this respect a number of end-users are including SSRT as part of the material specification requirements for downhole tubulars. Controversy exists over the suitability and reproducibility of SSRT results in testing nickel-base CRAs. The purpose of this paper is to highlight some of the problems associated with the recent SSRT quality assurance testing of nickel-base CRAs. The effects of surface finish, strain rate, and electrode potential are some of the parameters that should be considered in interpretation of SSRT data. In addition, evaluation criteria and comparison to other test methods will be discussed.
slow strain rate testing (SSRT), quality assurance, oil and gas, stress corrosion cracking (SCC), nickel-base, corrosion resistant alloys (CRAs), surface finish, strain rate, electrode potential, test methods
Group leader, Haynes International, Kokomo, IN