Internal SCC mechanism screen

Theme

Not a substitute for the licensed standard, your company procedures, or specialist materials / corrosion sign-off.

Screening filter

Step 1: choose the material class. Step 2: check each process scenario that applies (steady or transient service, including start-up, shutdown, and dew-point wetting). Tabs for the other material group are hidden by material choice; when you check scenarios, only matching mechanisms stay highlighted. Not a substitute for licensed standards, your company procedures, or specialist review.

1. Material

Not selected Carbon steel or low-alloy steel Austenitic stainless steel or nickel-based alloy

2. Process (check all that apply)

Carbon steel or low-alloy steel

Likely aqueous film (including first condensation) and bulk pH above 7.5 — flag alkaline carbonate SCC Acid-gas alkanolamine duty (MEA, DEA, DIPA, or MDEA) and metal temperature above 100 °F (51 °C) — flag amine SCC Caustic in the stream and metal temperature above 100 °F (51 °C) — flag caustic SCC HF exposure on carbon/low-alloy — flag HF-related blistering / stepwise hydrogen damage (HIC/SOHIC-HF) HF exposure on carbon/low-alloy — flag HF hydrogen stress cracking (HSC-HF) H₂S in service, H₂S partial pressure above 0.05 psia, and a stable liquid-water path (wall films / dew-point wetting count) — flag wet H₂S HIC/SOHIC H₂S in service, H₂S partial pressure above 0.05 psia, and a stable liquid-water path (wall films / dew-point wetting count) — flag wet H₂S SSC

2. Process (check all that apply)

Austenitic stainless steel or nickel-based alloy

Chloride-bearing aqueous film (including early condensation), metal between 75 °F and 345 °F (23.9–173.9 °C), and pH between 2.5 and 10.5 — flag chloride SCC Sulfur compounds in process so sulfide films and shutdown air exposure are realistic — flag PASCC

Mechanisms

Screening only: confirm susceptibility, severity, and limits with qualified corrosion / materials engineering and the governing RBI methodology and owner standards your organization adopts.

Open-RBI · Internal SCC mechanism screen · Flat HTML (no server required)