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In recent decade, the applications of DSS have significantly increased in oil & gas industry, due to their attractive properties compared to austenitic grades with similar corrosion resistance. The DSS products exhibit a better resistance to pitting, stress corrosion cracking and higher mechanical properties compared to other austenitic stainless steel grades. The microstructure of these materials consists of approximately 50% austenite (γ) and 50% ferrite (α) phases, obtained by means of a solution heat treatment.
A life cycle cost assessment led to the selection of DSS for field gas gathering network composing of more than 200 miles of pipelines. Buried portions are provided with external coating. Furthermore, due to high chloride content in the soils, the external corrosion threat was mitigated through the use of an external coating supplemented with CP.
As there was no industrial reference covering onshore DSS pipeline CP criteria, lab testing was conducted to establish the criteria and confirm if the risk of hydrogen embrittlement is managed appropriately. This is further evaluated with field data to confirm pipelines integrity.
The investigation on the specimens in the SCC susceptible conditions is included in Part 1, AMPP conference paper C2022-179982. In this Part 2, a case study is presented on the local corrosion on specimen surface or shoulder area although high ductility ratios in two testing conditions.
Standards NACE(1) MR0175 / ISO(2) 15156-31 have temperature-H2S-Cl-pH limits for safely using duplex stainless steels based on their Pitting Resistance Equivalent Number (PREN) of subcategory such as duplex stainless steel (DSS, PREN 30-40, Mo>1.5%) and super duplex stainless steel (SDSS, PREN 4045), temperature-pH domain of stress corrosion cracking (SCC) resistance can be used for material evaluation and provided by using slow strain rate testing (SSRT) screening in sour testing conditions2.