ASTM A312 TP321H High-Frequency Welded Finned Tube for Waste Heat Boilers is a high-performance heat transfer component designed for demanding thermal recovery systems. Manufactured with ASTM A312 TP321H austenitic stainless steel tubes as the base material, these finned tubes combine excellent high-temperature strength, oxidation resistance, and reliable heat transfer efficiency.

The high-frequency resistance welding process creates a strong metallurgical bond between the tube and fins, ensuring excellent mechanical stability under continuous thermal cycling, vibration, and high-temperature operating conditions. Compared with conventional finning methods, high-frequency welded fins provide a higher fin-to-tube connection strength and better long-term performance in harsh industrial environments.

TP321H is a stabilized stainless steel grade containing titanium, specifically developed for high-temperature service. It offers improved creep resistance and maintains mechanical properties during prolonged exposure to elevated temperatures, making it suitable for waste heat recovery equipment.

Common Applications

Typical applications include:
- Waste heat boilers
- Heat recovery steam generators and heat recovery units
- Process gas heat recovery systems
- Petrochemical and chemical processing plants
- Refineries
- Power generation facilities
- Industrial furnaces and high-temperature exhaust gas systems
- Gas turbine exhaust heat recovery systems

These finned tubes are especially suitable for applications requiring high corrosion resistance, thermal stability, and long service life under elevated temperatures.

Product Features

Base Tube Material: ASTM A312 TP321H Stainless Steel
Fin Type: High-Frequency Welded Helical Fins
Manufacturing Process: High-frequency resistance welding
High Temperature Performance: Excellent creep strength and oxidation resistance
Strong Bonding: Continuous welded connection between tube and fin
Thermal Efficiency: Increased heat transfer area compared with plain tubes
Long Service Life: Suitable for continuous operation in demanding industrial environments

Size Range

The following dimensions are commonly available for ASTM A312 TP321H High-Frequency Welded Finned Tubes. Customized dimensions can be manufactured according to customer drawings and project requirements.

Item	Typical Range
Base Tube Outside Diameter	16 mm – 219 mm
Tube Wall Thickness	1.5 mm – 20 mm
Tube Length	Up to 18,000 mm
Fin Height	6 mm – 30 mm
Fin Thickness	0.8 mm – 3.0 mm
Fin Pitch	2.0 mm – 10 mm
Fin Outside Diameter	30 mm – 280 mm

Chemical Composition (ASTM A312 TP321H)

Element	Composition (%)
Carbon (C)	≤ 0.04–0.10
Chromium (Cr)	17.0–19.0
Nickel (Ni)	9.0–12.0
Manganese (Mn)	≤ 2.00
Silicon (Si)	≤ 1.00
Phosphorus (P)	≤ 0.045
Sulfur (S)	≤ 0.030
Titanium (Ti)	5 × C – 0.70
Nitrogen (N)	≤ 0.10
Iron (Fe)	Balance

Mechanical Properties (ASTM A312 TP321H)

Property	Requirement
Tensile Strength	≥ 515 MPa
Yield Strength (0.2% Offset)	≥ 205 MPa
Elongation (50 mm)	≥ 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