The Oil & Gas Industry has had a long history with UNS(*1) S17400 (17-4PH) precipitation hardening stainless steel that has been marked by successful applications and numerous field failures. The results of an investigation into why and where the alloy has worked successfully and unsuccessfully are presented. A summary of a literature search of test data is presented with the results of laboratory tests exploring the boundaries of application. The lack of conservatism with our current wording of NACE MR0175/ISO 15156 is discussed with recommended changes to this standard that permit limited use while avoiding many of the misapplications.

Subject
Pits, Test methods, Materials failure, Corrosion failures, Materials, Yield stress, Valves, Acidity, Stress, Alloys, Chlorides, Stress corrosion cracking, Test specimen
Keywords:
Precipitation hardening, stainless steel, UNS S17400, 17-4PH, SSC, H2S, MR0175, ISO 15156)
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2014
Association for Materials Protection and Performance (AMPP)
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