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The four-point bend test as per NACE TM0316-2016 is used in the oil and gas industry as a common test to evaluate the resistance of line pipe steels to sulfide stress cracking. The appearance of stressinduced pits or grooves on the test specimens can sometimes be noted when testing is performed under high load, at low pH or in CO2 containing test environments. When evaluating SSC specimens, it is important to distinguish between stress-induced corrosion pits and SSC crack structures and their relevance for the SSC test result. Within this study a systematic investigation of the level of applied stress, the test gas composition and the surface finish of test specimens and their influence on the onset and growth of cracking of four-point bend SSC specimens was performed. In this context the role of shape and maximum depth of stressinduced corrosion pits and stress grooves are discussed in detail.
Key words: SSC, Four-Point Bend Test
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SSC testing was performed using transverse full-size four-point bend specimens with a thickness up to 35 mm at loads up to 90 % of the actual yield strength. Finite element simulations analyzed the stress distribution under high load.
There is an increasing need to define the operating envelope for materials typically used as oil country tubular goods. This paper reports results of sulfide stress cracking (SSC) tests that were performed in mild sour environment at temperatures below 107°C.