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Systematic Investigation Of The Role Of Stress-Induced Pits And Grooves In SSC Four-Point Bend Testing Of Line Pipe Steel

Picture for Systematic Investigation Of The Role Of Stress-Induced Pits And Grooves In SSC Four-Point Bend Testing Of Line Pipe Steel
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Product Number: 51321-16571-SG
Author: Thomas Haase / Christoph Kalwa/ Christoph Bosch
Publication Date: 2021
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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

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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