ASTM A376 TP347H Solid Fin Tubes for Economizers
Product Overview
ASTM A376 TP347H Solid Fin Tubes for Economizers are engineered for high-temperature heat recovery systems where long-term thermal stability, reliable pressure performance, and efficient heat transfer are essential. The combination of a TP347H stainless steel base tube and carbon steel (CS) solid fins provides an economical solution for economizer service in boilers, waste heat recovery units, and industrial heat exchangers.
The TP347H base tube offers excellent high-temperature strength and oxidation resistance, while the carbon steel fins significantly increase the external heat transfer area, improving thermal efficiency without unnecessarily increasing material costs. This material combination is particularly suitable for clean or mildly corrosive flue gas environments where high mechanical reliability and cost-effective operation are priorities.
Product Features
- High-temperature TP347H stainless steel base tube for excellent creep strength.
- Carbon steel solid fins for efficient heat transfer and economical production.
- Superior resistance to oxidation and intergranular corrosion at elevated temperatures.
- Strong metallurgical or mechanical bond between tube and fin for long service life.
- Suitable for continuous operation under demanding thermal cycling conditions.
- Customizable dimensions, fin geometry, and tube lengths according to project specifications.
Common Applications
ASTM A376 TP347H Solid Fin Tubes are widely used in:
- Boiler economizers
- Waste heat recovery boilers (WHRB)
- Heat recovery steam generators (HRSG)
- Industrial waste heat recovery systems
- Petrochemical process heaters
- Power plant heat exchangers
- Furnace convection sections
- Thermal oil heaters
- Industrial air preheaters
Material Specification
| Component |
Material |
| Base Tube |
ASTM A376 TP347H Stainless Steel |
| Fin Material |
Carbon Steel (CS) |
| Fin Type |
Solid Helical Fin |
| Manufacturing Method |
Welded or Integrally Attached Solid Fin (project dependent) |
Typical Size Range
| Item |
Standard Range |
| Tube Outside Diameter |
19.05 mm – 63.5 mm (3/4" – 2-1/2") |
| Tube Wall Thickness |
2.0 mm – 8.0 mm |
| Tube Length |
Up to 18,000 mm |
| Fin Height |
8 mm – 25 mm |
| Fin Thickness |
1.0 mm – 3.0 mm |
| Fin Pitch |
3 mm – 12 mm |
| Bare Tube End |
As required |
| Custom Sizes |
Available upon request |
Chemical Composition of ASTM A376 TP347H (Typical ASTM Requirements)
| Element |
Content (%) |
| Carbon (C) |
0.04–0.10 |
| Manganese (Mn) |
≤2.00 |
| Silicon (Si) |
≤0.75 |
| Phosphorus (P) |
≤0.045 |
| Sulfur (S) |
≤0.030 |
| Chromium (Cr) |
17.0–19.0 |
| Nickel (Ni) |
9.0–13.0 |
| Columbium + Tantalum (Nb + Ta) |
≥10 × C to ≤1.10 |
Chemical composition conforms to ASTM A376 requirements for TP347H.
Mechanical Properties of ASTM A376 TP347H
| Property |
Value |
| Tensile Strength |
≥515 MPa |
| Yield Strength (0.2% Offset) |
≥205 MPa |
| Elongation |
≥35% |
