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Alloy A975 Resistant To Severe Sour Environments And To Hydrogen Embrittlement

Picture for Alloy A975 Resistant To Severe Sour Environments And To Hydrogen Embrittlement
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Product Number: 51321-16814-SG
Author: Ernst Plesiutschnig; Rainer Fluch; Martin Wöls; Marianne Kapp; Greg Chitwood
Publication Date: 2021
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$20.00
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Alloy A975, a super austenitic stainless steel in the cold worked condition has been commonly used in drilling applications, where its combination of composition and high strength makes it highly resistant to pitting corrosion and fatigue. Now, after 15 years of use in drilling, this material can be considered for other oilfield applications.
Three commercial heats of cold worked (CW) A975 were subjected to different tests to assess its resistance to environmental assisted cracking. For reference, slow strain rate tests (SSRT) were performed at NACE MR0175 Levels VI and VII. Additionally, C-ring tests per NACE TM0177 Method C were performed at NACE MR0175 Levels V and VI to support the SSRT results. Light optical microscopy and scanning electron microscopy were used to analyze the specimens before and after the tests.
The SSRT show good ductility values compared to reference tests up to NACE Level VI. The Cring
testing also indicates similar cracking resistance under these conditions. The results from
SSRT under cathodic potential also demonstrate good resistance against hydrogen embrittlement.

Alloy A975, a super austenitic stainless steel in the cold worked condition has been commonly used in drilling applications, where its combination of composition and high strength makes it highly resistant to pitting corrosion and fatigue. Now, after 15 years of use in drilling, this material can be considered for other oilfield applications.
Three commercial heats of cold worked (CW) A975 were subjected to different tests to assess its resistance to environmental assisted cracking. For reference, slow strain rate tests (SSRT) were performed at NACE MR0175 Levels VI and VII. Additionally, C-ring tests per NACE TM0177 Method C were performed at NACE MR0175 Levels V and VI to support the SSRT results. Light optical microscopy and scanning electron microscopy were used to analyze the specimens before and after the tests.
The SSRT show good ductility values compared to reference tests up to NACE Level VI. The Cring
testing also indicates similar cracking resistance under these conditions. The results from
SSRT under cathodic potential also demonstrate good resistance against hydrogen embrittlement.

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