ASTM A312 TP304H High Frequency Welded Finned Tube for Air Preheaters
ASTM A312 TP304H High Frequency Welded Finned Tubes are engineered for air preheater applications operating under elevated temperatures and demanding industrial conditions. Manufactured using high-frequency resistance welding technology, the steel fins are continuously welded to the TP304H stainless steel base tube, providing excellent heat transfer efficiency, reliable fin bonding, and long-term structural stability.
ASTM A312 TP304H is a high-carbon version of Type 304 stainless steel specifically developed for elevated-temperature service. Its enhanced creep strength and oxidation resistance make it particularly suitable for heat recovery systems where prolonged exposure to temperatures above 500°C is common.
These finned tubes are widely used in power generation, petrochemical processing, industrial furnaces, and waste heat recovery systems requiring efficient air heating and energy conservation.
- Manufactured from ASTM A312 TP304H stainless steel for elevated-temperature service.
- High-frequency welded fins ensure excellent metallurgical bonding and high thermal conductivity.
- Superior oxidation resistance in hot gas environments.
- High creep strength for continuous high-temperature operation.
- Uniform fin geometry improves heat transfer efficiency while minimizing pressure drop.
- Suitable for both new installations and replacement projects.
- Available in customized fin dimensions according to project specifications.
ASTM A312 TP304H High Frequency Welded Finned Tubes are commonly used in:
- Air Preheaters
- Boiler Air Heating Systems
- Waste Heat Recovery Units
- Utility and Industrial Power Plants
- Petrochemical Fired Heaters
- Refinery Process Heaters
- Industrial Furnace Heat Recovery Systems
- Flue Gas Heat Exchangers
- Heat Recovery Steam Generators (HRSG)
- Chemical Processing Plants
| Item | Standard Range |
|---|---|
| Base Tube Outside Diameter | 19.05 mm – 63.5 mm (3/4" – 2-1/2") |
| Base Tube Wall Thickness | 2.0 mm – 8.0 mm |
| Tube Length | Up to 18,000 mm |
| Fin Height | 8 mm – 25 mm |
| Fin Thickness | 0.8 mm – 2.0 mm |
| Fin Pitch | 3 mm – 12 mm |
| Fin Material | Carbon Steel, Stainless Steel or Alloy Steel (according to service conditions) |
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 18.00 – 20.00 |
| Nickel (Ni) | 8.00 – 11.00 |
| Nitrogen (N) | ≤ 0.12 – 0.18 |
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 35% |
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