ASME SA182 F304H Stainless Steel Ring 1.4948 Steel Forged Ring Heat Exchanger Spare Parts
ASME SA182 F304H Stainless Steel Forged Ring for Heat Exchanger Application
Function of Forged Rings in Heat Exchangers
These are the heavy structural components, not the tubes themselves:
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Tubesheets: The thick drilled ring/plate that holds the tube bundle (e.g., TP321 tubes). F304H provides the strength to withstand high differential pressure between shell-side and tube-side fluids.
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Flange Rings: Welded or integral rings at the channel ends for bolting to piping or bonnets.
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Channel Barrels / Closures: Cylindrical forged sections for high-pressure inlet/outlet headers.
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Bearing / Support Rings: Internal rings supporting tube bundles or flow distributors.
Chemical composition % of ASME SA182 F304H Stainless Steel Forged Ring Heat Exchanger Spare Parts
| Geade | C | Mn | Si | P | S | Cr | Ni | N |
|---|---|---|---|---|---|---|---|---|
| 304H | min: 18.0 max:20.0 | min: 8.0 max: 10.5 | min: 0.04 max:0.10 | 0.75 max | 2.0 max | 0.04 max | 0.03 max | 0.10 max |
Mechanical properties of grade ASTM A182 F304H Flange are displayed in the following table.
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 304H | 515 | 205 | 40 | 92 | 201 |
Physical properties of ASME SA182 F304H Stainless Steel Forged Ring Heat Exchanger Spare Parts
| Grade | Density(kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 304H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
Specific Requirements for Heat Exchanger Spare Parts (Forged Rings)
When used for tubesheets, flanges, or channel barrels, forged rings must meet these critical requirements:
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Grain Size: ASME SA182 requires a fine grain size (ASTM No. 7 or finer) for F304H to meet creep design curves. Coarser grains reduce rupture life.
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Ultrasonic Examination (UT): For hollow forgings (rings) over specific thicknesses, UT is required to detect internal laminations or porosity.
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Liquid Penetrant Examination (PT): Required for surface defect detection on finished machined surfaces (sealing faces of flanges).
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Solution Annealing: Must be heated to 1040°C – 1120°C and rapidly quenched (water or rapid air) to put carbides into solution before service.
Application
- Petroleum Refining (Hydroprocessing)
- Petrochemical (Ethylene / Olefins)
- Power Generation (Thermal & Nuclear)
- Hydrogen Production (SMRs)
- Shipbuilding
- Heat Exchanger
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