FAQ's

NACE MR0175 limits for UNS N06975 and UNS N10276

Sulfur-resistant Alloys for Different Temperatures

This page provides an answer to an inquiry regarding the suitability of certain alloys in the presence of sulfur at different temperatures, based on NACE MR0175/ISO 15156-3, Sub-clause A.4.2, Table A.14.

Inquiry Details

The inquiry asks whether there are any sulfur-resistant alloys between the temperature range of 425°F and 300°F, and whether UNS N06975 or UNS N10276 is suitable for well environments with a bottom-hole temperature of 350°F and produced brine that has sulfur.

Comparison Limitations

The answer clarifies that the comparisons made between materials may not be valid because the data sets for the materials considered vary in H₂S limits, temperature, and metallurgical limits that are imposed. The limits given are believed to be conservative and that further testing could potentially demonstrate that true limits are less restrictive than those indicated.

Suitable Alloy

The answer also confirms that UNS N10276 would be acceptable for the given conditions.

References

This question pertains to NACE MR0175/ISO 15156-3 A.4.2, Table A.14, and A.33, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2003-13 Q4.

Further Assistance

For further assistance with selecting the appropriate alloys for your intended service, please do not hesitate to contact us.

Are you experiencing technical challenges that are compromising your project? Contact us now and let us to get your project back on track!

Talk to an expert

Get in touch with us