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NACE MR0175
An international standard (ISO 15156) specifying material requirements for resistance to sulfide stress cracking (SSC) in sour (H2S-containing) oil and gas environments.
NACE MR0175 / ISO 15156
This standard is the primary reference for selecting metallic materials for equipment used in oil and gas production containing hydrogen sulfide (H2S). It specifies requirements for carbon steel, CRAs (corrosion resistant alloys), and other metals.
Key Requirements
- Maximum hardness limits (e.g., 22 HRC for carbon steel)
- Approved material grades and conditions
- Environmental severity levels
- Testing requirements