Oil and Gas Metallics

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The Oil and Gas Materials Selection & Metallurgy Technical Community of Interest is a group of people (both AMPP members and nonmembers) who have come together for the purpose of furthering a common cause by sharing wisdom, knowledge, information, and/or data  for evaluation and methods of selection of types of metals for all types of equipment used for oil and gas production.

  • 1.  Pitting Resistance of Alloy 825 in sour service (O2<10ppb) and High Chlorides

    Posted 10-20-2025 05:52 AM

    Hi everyone, please share your thoughts on pitting resistance of Alloy 825 in sour service (hydrocarbon + Produced water with Chlorides up to 120000ppm), operating temperature (60-90 Deg. C) when Alloy 825 can be used as per NACE MR0175/ISO1515-3.



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    Qaiser Zia
    Technip France- Tour Adria
    Abu Dhabi
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  • 2.  RE: Pitting Resistance of Alloy 825 in sour service (O2<10ppb) and High Chlorides

    Posted 10-28-2025 06:51 AM

    Hi Qaiser,

    The scope of NACE MR0175 does not discuss/cover pitting resistance. In other words, NACE MR0175 is about damage mechanism(s) driven by cracking. 



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    Mohsen Bahrami
    Calgary AB
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    Original Message


  • 3.  RE: Pitting Resistance of Alloy 825 in sour service (O2<10ppb) and High Chlorides

    Posted 10-28-2025 06:51 AM

    Hi Qaiser, the scope of NACE MR0175 does not cover pitting (in other words, damage mechanism(s) driven by cracking is/are discussed).



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    Mohsen Bahrami
    Calgary AB
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    Original Message


  • 4.  RE: Pitting Resistance of Alloy 825 in sour service (O2<10ppb) and High Chlorides

    Posted 10-28-2025 11:49 AM

    Qaiser,

    Second Mohsen on not using NACE MR0175 for identifying localized corrosion limits. But there is test data available in AMPP papers and elsewhere. One example is 
    "nace-02042-Selection Of UNS N08825 As Cladding Material For Offshore Pipelines Transporting Sour Multiphase Hydrocarbon". As with any test data, several caveats with respect to testing limits, processing part unknowns etc have to be looked at before directly using the data. But its a good start with pointers to some field experiences too.  By the way, NACE TR1F192 also addresses the topic. 



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    Sreekar Parimi
    Houston TX
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    Original Message