What Is ASTM A182 F22?
F22 is a 2.25Cr-1Mo low-alloy steel forging in ASTM A182. It is the standard Cr-Mo grade for the hottest oil-refinery and hydrogen-service piping, offering high creep strength and resistance to high-temperature oxidation.
Temperature Range
Rated up to 538°C in the ASME B16.5 pressure-temperature tables.
Material Group (per ASME B16.5)
Per ASME B16.5-2025 Table 1A, A182 Gr. F22 Class 3 (2.25Cr-1Mo) belongs to Material Group 1.10.
Corrosion Resistance
Like F11, F22 is selected for elevated-temperature strength and scaling resistance, not aqueous corrosion (no separate alloy-steel row in the Schweitzer tables; treat like carbon steel for wet corrosion). For sour service consult NACE/ISO guidance and specify the appropriate heat treatment.
Typical Applications
- Hydroprocessing and refinery high-temperature flanges and fittings
- Reformer and heater piping components
- ASME B16.5 and B16.47 flanges for hot, high-pressure service
Chemistry & Mechanical Properties
Cr-Mo composition and mechanical properties per ASTM A182 — consult the standard for exact limits. 3.1 mill certificates supplied.
Related Standards
- ASME B16.5 — Pipe Flanges (NPS 1/2–24)
- ASME B16.47 — Large-Diameter Flanges (NPS 26–60)
- ASTM A182 F11 — 1.25Cr-0.5Mo Alloy Steel
- ASTM A105 — Carbon Steel Forgings
- Our Flange Range
FAQ
What temperature range does F22 cover?
Up to 538°C per the ASME B16.5 Group 1.10 tables.
Where is F22 used?
The hottest refinery circuits: hydrotreaters, reformers, heater tubes and associated high-pressure flanges.
Is F22 suitable for sour service?
Not automatically — sour service requires controlled hardness and per-NACE material selection; send us your service conditions for confirmation.
F22 vs F11?
F22 has higher chromium and molybdenum, hence higher allowable stress at temperature; F11 is the economical alternative for milder hot service.
Can F22 be welded?
Yes, but Cr-Mo forgings require controlled preheat and post-weld heat treatment per the welding procedure to achieve the specified mechanical properties.
Need This Standard for Your Project?
We manufacture and export flanges, fittings and gaskets to ASME standards. Send your standard, size, material, and quantity — we reply within 24 hours.