ASME SA182 F304 Heat Exchange Flange Stainless Steel Flanges Suitable For Medium To High Temperature
ASME SA182 F304 Heat Flange refers to a flange conforming to ASME forging standards, made of 304 stainless steel, and suitable for medium to high temperature applications.
For F304, the recommended continuous operating temperature is approximately 815°C. For applications involving superheated steam or other high-temperature conditions, F304H, with its higher carbon content and better high-temperature strength, may be used if necessary.
Bolt selection compatible with ASME SA182 F304 Heat Flange: High-temperature bolts must be used. Ordinary carbon steel bolts, such as SA193 B7 or SA193 B8M Class 2, are strictly prohibited. Class 2 bolts are strain-strengthened and have higher high-temperature yield strength.
If a flange is required in a large heat exchanger with extremely stringent requirements, a specialized flange must be selected; ordinary flanges cannot be used as substitutes.
| Chemical Composition | |||
| Element (%) | SA-182 F304 (UNS S30400) | SA-182 F304L (UNS S30403) | SA-182 F304H (UNS S30409) |
| Carbon, max | 0.08 | 0.03 | 0.04 - 0.10 |
| Manganese, max | 2 | 2 | 2 |
| Phosphorus, max | 0.045 | 0.045 | 0.045 |
| Sulfur, max | 0.03 | 0.03 | 0.03 |
| Silicon, max | 1 | 1 | 1 |
| Chromium | 18.0 - 20.0 | 18.0 - 20.0 | 18.0 - 20.0 |
| Nickel | 8.0 - 11.0 | 8.0 - 13.0 | 8.0 - 11.0 |
| Nitrogen, max | 0.1 | 0.1 | 0.1 |
| Other Elements | - | - | - |
| Mechanical & Heat Treatment Requirements | ||
| Property / Requirement | SA-182 F304 / F304L / F304H | Notes & Conditions |
| Tensile Strength, min | 515 MPa (75 ksi) | At room temperature. |
| Yield Strength (0.2% Offset), min | 205 MPa (30 ksi) | At room temperature. |
| Elongation in 2 in. or 50 mm, min | 30% | For round specimens. Minimum is 28% for flat specimens. |
| Reduction of Area, min | 50% | - |
| Hardness, max | 192 HBW (90 HRB) | Brinell (HBW) or Rockwell B scale. |
| Heat Treatment (Mandatory) | Solution Annealing followed by rapid cooling (quenching in water or rapid cooling by other means). | Typical annealing temperature range: 1040°C - 1150°C (1900°F - 2100°F). This is required to dissolve carbides and achieve a homogeneous austenitic structure with optimal corrosion resistance. |
| Product Form | Forgings (flanges, fittings, valves) | - |
Applications:
