NACE MR0175
/glossary/nace-mr0175International standard for materials resistant to sulfide stress cracking in sour service.
In detail
NACE MR0175/ISO 15156 specifies requirements for materials used in equipment exposed to oilfield environments containing hydrogen sulfide (H2S). It defines hardness limits, heat treatment requirements, and chemical composition restrictions to prevent sulfide stress cracking. Steel pipes certified to NACE MR0175 are mandatory for sour gas pipelines, refinery process lines, and oilfield applications where H2S is present above threshold partial pressures.
Where you'll meet this in procurement
You will meet NACE MR0175 when a buyer, consultant, or mill quote names a governing specification. Confirm which revision applies, what tests the standard requires, and whether the grade on the MTC actually matches the NACE MR0175 call-out on the RFQ before you lock commercial terms.