H₂S Sour Service Material Check | ISO 15156 / NACE MR0175

Published by Nikolai Shelkovenko on

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H₂S Sour Service Material Check

Screen materials for suitability in hydrogen sulfide (H₂S) environments per ISO 15156 / NACE MR0175. Check hardness, yield strength, and environmental limits against standard requirements.

ISO 15156 NACE MR0175 SSC / HIC / SCC

Assessment

Overall Sour Service Assessment
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Hardness Check
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Yield Strength Check
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Applicable ISO 15156 Part
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Sour Service Domain
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Failure Mechanisms to Consider
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ISO 15156 / NACE MR0175 Structure

  • Part 1: General principles for selection of cracking-resistant materials
  • Part 2: Carbon and low-alloy steels, cast irons
  • Part 3: CRAs (corrosion-resistant alloys) and other alloys

Key Hardness Limits

MaterialMax Hardness (HRC)Max Yield (MPa)Notes
Carbon / Low-Alloy Steel22 HRC690 MPaISO 15156-2; weld zones also limited
Austenitic SS (304/316)22 HRC—Generally acceptable; cold-worked limited
Duplex SS (2205)28 HRC—Limited by temperature and H₂S level
Super Duplex (2507)32 HRC—More restrictive environmental limits
Martensitic SS (13Cr)23 HRC—Very restricted in sour service
Nickel Alloy 625/C-27635–40 HRC—Per ISO 15156-3 Table A.24+

Cracking Mechanisms

  • SSC — Sulfide Stress Cracking: hydrogen-assisted cracking of susceptible metals under tensile stress in H₂S
  • HIC — Hydrogen Induced Cracking: internal cracking from hydrogen diffusion (no external stress needed)
  • SOHIC — Stress-Oriented HIC: HIC combined with applied/residual stress
  • SCC — Stress Corrosion Cracking: chloride or polythionic acid SCC in CRAs

⚠️ Disclaimer: This tool provides preliminary screening only. Full compliance requires detailed assessment per the complete ISO 15156 standard, including consideration of welding, heat treatment, cold work, and specific environmental conditions. Always consult a materials/corrosion engineer.

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