HFW Finned Tubes ASTM A312 TP347H Stainless Steel For Waste Heat Boilers
ASTM A312 TP347H High Frequency Welded (HFW) stainless steel finned tubes are top-tier, high-efficiency heat exchange elements designed specifically for high-temperature, high-pressure, highly corrosive, and high-dust waste heat boiler systems. Using high-carbon niobium-containing austenitic stainless steel TP347H as the base tube, high-frequency induction welding achieves a metallurgical bond between the fins and the base tube, perfectly solving the five core challenges of heat exchange efficiency, high-temperature strength, corrosion resistance, vibration resistance, and ash accumulation resistance in high-temperature flue gas waste heat recovery.
Chemical Composition (%) max
| Grade |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
| TP347H |
0.04-0.10 |
2.00 |
0.045 |
0.030 |
1.00 |
17.0-19.0 |
9.0-13.0 |
The columbium content shall be not less than eight times the carbon content and not more than 1.0%.
Mechanical Properties
| Grade |
Tensile Strength min |
Yield Strength min |
Elongation in 2" or 50mm min |
| TP347H |
75ksi (515 MPa) |
30ksi (205 MPa) |
35% |
TP347H (UNS S34709) is a high-carbon niobium-containing stabilized austenitic stainless steel with a long-term working temperature of ≤ 650℃ and a short-term oxidation resistance temperature of 850~925℃. Its creep strength and endurance strength are far superior to 304H/321H.
Two Main Application Areas and Scenarios of A312 TP347H HFW Finned Tubes
1. Power Industry (Largest Application Market)
Boiler Systems
Economizer: Recovers waste heat from boiler tail gas to heat feedwater, improving boiler efficiency by 3%–5% and reducing coal consumption.
Air Preheater: Preheats combustion air, reduces exhaust gas temperature, and promotes complete fuel combustion.
Superheater/Reheater: TP321/347 material, used for high-temperature steam superheating, suitable for operating conditions below 600℃.
Waste Heat Boiler (HRSG): Recovers waste heat from gas turbine/internal combustion engine exhaust gas to generate steam and generate electricity, suitable for flue gas temperatures of 200–600℃.
Nuclear Power/Geothermal: Steam generator, condenser, geothermal heat exchanger, suitable for high temperature, high pressure, and complex media.
2. Petrochemical Industry (Second Largest Application Market)
Process Heating/ Cooling: Shell-and-tube heat exchangers and air coolers for reactors, fractionation towers, and heating furnaces, handling high-temperature and corrosive media (oil and gas, acids and alkalis, hydrogen sulfide).
Waste Heat Recovery: Waste heat recovery from flue gas/process gas in refining units, ethylene cracking, and ammonia synthesis to improve energy efficiency.
Oil and Gas Processing: Natural gas coolers, oil and gas separators, and heat exchange equipment for offshore platforms; 316L stainless steel resistant to seawater/chloride ion corrosion.
Your message must be between 20-3,000 characters!
