SS 321/347 flange manufacturer, Mumbai. Ti/Nb-stabilized for high-temp welded service, refinery furnace outlet piping. Class 150-2500. Quote in 30 min.
ASTM A182 F321 (Titanium stabilized) and F347 (Niobium stabilized) forged flanges are specifically alloyed to eliminate intergranular corrosion in high-temperature service between 425°C and 815°C.
Governing specification limits per ASTM / ASME standards. Actual values provided on EN 10204 3.1 MTC.
| Element | Specification Limit / Composition |
|---|---|
| Titanium (Ti) | 5x C min, 0.70% max (F321) |
| Niobium + Tantalum (Nb+Ta) | N/A |
| Chromium (Cr) | 17.0 - 19.0% |
| Nickel (Ni) | 9.0 - 12.0% |
| Property | Specification Limit |
|---|---|
| Yield Strength | 205 MPa min |
| Tensile Strength | 515 MPa min |
| Service Temp | Class 150 | Class 300 | Class 600 | Class 900 |
|---|---|---|---|---|
| Ambient (-29 to 38°C) | 275 psi | 720 psi | 1440 psi | 2160 psi |
A: Titanium (in 321) and Niobium (in 347) have a higher affinity for carbon than chromium. They form stable carbides (TiC / NbC) during thermal exposure, preventing chromium depletion at grain boundaries.
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