Alloy steel F91 flange manufacturer, Mumbai. UNS K91560 9Cr-1Mo-V creep-resistant steel for ultra-supercritical power steam lines to 650°C. Quote in 30 min.
ASTM A182 F91 is a 9% Chromium, 1% Molybdenum alloy steel micro-alloyed with Vanadium and Niobium, providing exceptional creep rupture strength and thermal fatigue resistance at operating temperatures up to 650°C.
Governing specification limits per ASTM / ASME standards. Actual values provided on EN 10204 3.1 MTC.
| Element | Specification Limit / Composition |
|---|---|
| Chromium (Cr) | 8.0 - 9.5% |
| Molybdenum (Mo) | 0.85 - 1.05% |
| Vanadium (V) | 0.18 - 0.25% |
| Niobium (Nb) | 0.06 - 0.10% |
| Nitrogen (N) | 0.030 - 0.070% |
| Property | Specification Limit |
|---|---|
| Yield Strength | 415 MPa (60 ksi) min |
| Tensile Strength | 585 - 760 MPa |
| Service Temp Range | Up to 650°C (1,200°F) |
| Service Temp | Class 150 | Class 300 | Class 600 | Class 900 |
|---|---|---|---|---|
| Ambient (-29 to 38°C) | 290 psi | 750 psi | 1500 psi | 2250 psi |
A: F91 forms a fully martensitic structure upon cooling. Strict PWHT (typically 730°C to 760°C) is mandatory to temper the martensite and restore impact toughness.
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