Currently Alloy 600 (UNS N06600) is not listed in NACE MR0175.
Question: Your name was given to me as someone that might be able to help sort out an issue that was raised by one of my co-workers. At one point many years ago, alloy 600 (UNS N06600) was included in MR0175 as a specific alloy that could be used in NACE applications. For some reason along the way with the revisions between 2002/2003 and the changeover to ISO 15156, it has been left out or removed on purpose. However, I was not able to find out specifically what happened to alloy 600. A friend did a search of ISO 15156 and found a query on the same topic (2011-03 on UNS N06600) with the same question as mine. The proposed response was as listed below: “N06600 is not listed in 15156 as an acceptable alloy. There is currently a ballot proposal to introduce UNS N06600 back into NACE MR0175/ISO 15156 Standard. According to ISO 15156 rules this ballot will have to pass votes from the Maintenance Panel and the Oversight Committee to be accepted”. No records of the proposed ballot were found. Not sure what happened to this. I was told that my inquiry should be sent to you to be able to get the formal inquiry recorded and entered into the NACE system so that the Maintenance Panel would be able to investigate. I do appreciate your help. If you have any questions, please let me know.
Item 4 in Minutes of meeting from San Antonio MP meeting: Nickel Alloy 600 ballot. Alloy 600 was in the previous version of MR0175 and left off in translation into 15156. The proposal was to relist without limits in annealed conditions with 35 HRC maximum. The ballot submitter was asked to resubmit with data or use history; we have not had a reply as of this meeting.
Reference: ISO 15156 Maintenance Panel Inquiry #2014-06
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