ASME SA182 F304 Heat Exchange Flange Stainless Steel Flanges Suitable For Medium To High Temperature
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:
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