Lesson Learned - Sulfide Stress Cracking (SSC)

Asked by odadmin 6 years, 2 months ago | 2 Answers

Equipment including nuts and bolts in the H2S environments (i.e. Sour Service, Fuel Gas System) shall consider the followings: - Using Super Duplex material - Using 3rd party verification of metallurgy and mechanical properties - PMI (Positive Material Identification) Testing upon arrival at the facilities


2 Answers

2
Normandy 6 years, 2 months ago

Type

Examples Advantages Disadvantages
Ferritic 410S, 430, 446 Low cost, moderate corrosion resistance & good formability Limited corrosion resistance, formabilty & elevated temperature strength compared to austenitics
Austenitic 304, 316 Widely available, good general corrosion resistance, good cryogenic toughness. Excellent formability & weldability Work hardening can limit formability & machinability. Limited resistance to stress corrosion cracking
Duplex 1.4462 Good stress corrosion cracking resistance, good mechanical strength in annealed condition Application temperature range more restricted than austenitics
Martensitic 420, 431 Hardenable by heat treatment Corrosion resistance compared to austenitics & formability compared to ferritics limited. Weldability is limited.
Precipitation Hardening 17/4PH Hardenable by heat treatment, but with better corrosion resistance than martensitics Limited availability, corrosion resistance, formability & weldability restricted compared to austenitics

2
antonjoh 6 years, 2 months ago

Also consider the following materials when selecting/designing equipment:

  • S41425: used in slightly sour oil and gas
  • S31254, N08904
  • S31654, S31266, S34565, N08926, N08367
  • N07718, N09925

and few others but each one is dependent upon temperatures and environments when designing.

Refer to NACE MR0175/ISO 15156 for more information.

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