Valve Material Reference
ASTM A182 F91 Valve
P91 Chrome-Moly (9Cr-1Mo-V)ASTM A182 F91 is the forged 9Cr-1Mo-V alloy specification for ultra-high-temperature steam service.
Form
Forged
Max Temp
+650°C (+1200°F) — supercritical and USC plants
Min Temp
−18°C — limited toughness at low temperature
Category
Alloy Steel
Chemical Composition — ASTM A182 F91
Temperature Range
Up to +650°C (+1200°F)
Maximum Temperature
+650°C (+1200°F) — supercritical and USC plants
Minimum Temperature
−18°C — limited toughness at low temperature
Equivalent Grades — ASTM A182 F91
| Standard | Equivalent Grade |
|---|---|
| ASTM pipe equiv. | A335 P91 (pipe), A387 Grade 91 (plate) |
| EN wrought | X10CrMoVNb9-1 / 1.4903 |
| DIN | X10CrMoVNb9-1 |
| JIS | STPA92 |
Suitable Services
Supercritical power plant steam (>22 MPa, >560°C)
Ultra-supercritical (USC) steam (>600°C)
Hydrogen service at elevated temperature
FCCU and refinery high-temperature service
Not Suitable For
Standard power plant service where WC9 is adequate (over-specified)
Corrosive service
Low-temperature service
Valve Body Applications
Main steam isolation valves (MSIV) for supercritical and USC plants
HP turbine stop and control valves
Hot reheat stop valves
Boiler drum and superheater isolation valves in USC plants
Trim Applications
F91 stems in high-temp applications
Stellite-overlaid seats and seating faces
Typical Valve Types in ASTM A182 F91
Gate and globe valves: Class 900–2500 for supercritical steam
Required for NTPC supercritical projects (Vindhyachal Stage V, Tanda, Bongaigaon)
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We supply ASTM A182 F91 (P91 Chrome-Moly (9Cr-1Mo-V)) gate valves, globe valves, ball valves, check valves, and more. Full certification documentation — EN 10204 3.1/3.2 MTCs, hydro test certs — as standard.