HFW Finned Tubes ASTM A312 TP347H Stainless Steel For Waste Heat Boilers

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

The columbium content shall be not less than eight times the carbon content and not more than 1.0%.

Mechanical Properties

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.