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.

Features

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.

Common Applications

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

Size Range

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)

Chemical Composition of ASTM A312 TP304H

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

Mechanical Properties of ASTM A312 TP304H

Property	Value
Tensile Strength	≥ 515 MPa
Yield Strength (0.2% Offset)	≥ 205 MPa
Elongation	≥ 35%

Tags:

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

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