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51318-11163-Evaluation of Corrosion of Austenitic Steels and Comparison with Martensitic Stainless Steel 17-4

A series of NACE TM0177 Tensile Test Method A tests were conducted on various commercially available chromium-manganese austenitic stainless steels as well as 17-4PH in the 110ksi-to-130ksi yield strength range (34 - 35 HRC max).

Product Number: 51318-11163-SG
Author: Tatiana R. Ayers, Manuel P. Marya, Dean Lauppe
Publication Date: 2018
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In searching for plausible replacements of 17-4PH (UNS S17400) HH1150 for selected oilfield applications where the presence of reservoir fluid is a possibility, a series of NACE TM0177 Tensile Test Method A tests were conducted on various commercially available chromium-manganese austenitic stainless steels as well as 17-4PH in the 110ksi-to-130ksi yield strength range (34 - 35 HRC max). Complementarily, microstructure analyses and electrochemical tests, among other standard tests, were applied to all alloys for comparison purposes and were used to explain the sulfide stress cracking performance of each alloy. The test results reveal that chromium-manganese austenitic stainless steels with higher PREN (higher than 25) and clean grain boundaries (e.g. no semi or continuous networks of precipitates) can have similar or better sulfide stress cracking performance than 17-4PH in slightly more aggressive sour environments than recommended by NACE MR0175/ISO15156 for 17-4PH. Other chromium-manganese austenitic stainless steels (PREN less than 20) exhibited major signs of embrittlement and are not suitable for future expanded investigations. As inferred by PREN, the electrochemical testing also demonstrates an improved performance of several austenitic alloys in artificial seawater compared to 17-4PH.

Key words: austenitic stainless steel, chromium-manganese, sulfide corrosion cracking, SCC, embrittlement, PREN, microstructure.

In searching for plausible replacements of 17-4PH (UNS S17400) HH1150 for selected oilfield applications where the presence of reservoir fluid is a possibility, a series of NACE TM0177 Tensile Test Method A tests were conducted on various commercially available chromium-manganese austenitic stainless steels as well as 17-4PH in the 110ksi-to-130ksi yield strength range (34 - 35 HRC max). Complementarily, microstructure analyses and electrochemical tests, among other standard tests, were applied to all alloys for comparison purposes and were used to explain the sulfide stress cracking performance of each alloy. The test results reveal that chromium-manganese austenitic stainless steels with higher PREN (higher than 25) and clean grain boundaries (e.g. no semi or continuous networks of precipitates) can have similar or better sulfide stress cracking performance than 17-4PH in slightly more aggressive sour environments than recommended by NACE MR0175/ISO15156 for 17-4PH. Other chromium-manganese austenitic stainless steels (PREN less than 20) exhibited major signs of embrittlement and are not suitable for future expanded investigations. As inferred by PREN, the electrochemical testing also demonstrates an improved performance of several austenitic alloys in artificial seawater compared to 17-4PH.

Key words: austenitic stainless steel, chromium-manganese, sulfide corrosion cracking, SCC, embrittlement, PREN, microstructure.

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