ASTM A182 F310 Stainless Steel WNRF Flange ASME B16.5 Forged Steel Flange
ASME B16.5 ASTM A182 F310 Stainless Steel Weld Neck RF Flange for Industries
Welding Neck flanges have a long tapered hub, used in high-pressure systems. Good for reducing stress. RF is Raised Face, which is the sealing face. The raised face helps with gasket seating. ASME B16.5 for dimensions, pressure-temperature ratings. Also, B16.47 for larger flanges. Stainless Steel 310 (SS 310) is a high-alloy austenitic stainless steel containing 24–26% chromium and 19–22% nickel, renowned for its exceptional oxidation resistance, superior high-temperature strength (up to 2100°F/1150°C), and durability in harsh environments.
ASTM A182 F310/310S/310H Flange Equivalent Grade
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 310 | 1.4841 | S31000 | SUS 310 | 310S24 | 20Ch25N20S2 | – | X15CrNi25-20 |
| SS 310S | 1.4845 | S31008 | SUS 310S | 310S16 | 20Ch23N18 | – | X8CrNi25-21 |
| SS 310H | – | S31009 | – | – | – | – | – |
ASTM A182 F310/310S/310H Flange Chemical Composition
| Grade | Ni | P | S | C | Mn | Si | Cr | Mo | Fe |
| SS 310 | 19.00 – 21.00 | 0.020 max | 0.015 max | 0.015 max | 2.0 max | 0.15 max | 24.00 – 26.00 | 0.10 max | 54.7 min |
| SS 310S | 19.00 – 21.00 | 0.045 max | 0.030 max | 0.08 max | 2.0 max | 1.00 max | 24.00 – 26.00 | 0.75 max | 53.095 min |
| SS 310H | 19.00 – 21.00 | 0.045 max | 0.030 max | 0.04 – 0.10 | 2.0 max | 1.00 max | 24.00 – 26.00 | – | 53.885 min |
ASTM A182 SS 310 Flanges Mechanical Properties
| Tensile Strength | Yield Strength (0.2%Offset) | Density | Melting Point | Elongation |
| Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 7.9 g/cm3 | 1402 °C (2555 °F) | 40 % |
Manufacturing process:
Forged, then machined. Heat treatment – solution annealing for F310 to maintain corrosion resistance. Surface finish on the Raised Face, maybe 125-250 µin for serrated finish.
Comparative Perspective
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VS. F304/F316:
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Superior high-temperature strength but less versatile in corrosive chemical environments.
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VS. F321/F347:
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No titanium/niobium stabilization, making F310 less prone to sensitization but unsuitable for intermittent high-low temp cycling.
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VS. Alloy 800H/HT:
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Lower cost alternative for oxidation resistance but lacks the same creep strength.
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Applications
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High-temperature systems (furnaces, boilers, heat exchangers).
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Petrochemical, oil/gas, and power generation industries.
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Environments with cyclic thermal stresses.
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