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%

Tags:

Studded Tube

Solid Fin Tube

Serrated Finned tube

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Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

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Titanium Alloy Steel Heat Exchanger Tube

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U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

products details

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube