ASTM A376 TP347H Alloy Steel HFW Solid Finned Tube For Heat Exchangers
1. What is ASTM A376 TP347H Alloy Steel HFW Solid Finned Tube?
The ASTM A376 TP347H Alloy Steel HFW Solid Finned Tube is a premium heat transfer solution engineered for extreme high-temperature and corrosive environments. It combines a seamless niobium-stabilized austenitic stainless steel base tube (ASTM A376 TP347H) with helically wound solid carbon steel fins bonded via high-frequency welding (HFW). This robust design delivers unmatched resistance to oxidation, sulfidation, and creep deformation up to 900°C (1,652°F), making it ideal for superheaters, reformers, and waste heat boilers in power plants and refineries. The Nb stabilization prevents carbide precipitation, ensuring long-term performance in cyclic thermal services.
2. Chemical & Mechanical Properties
Dimensional Specifications:
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Bare Tube Diameter:16-219mm |
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Fin Height::5-30mm |
Fin Thickness: 0.8-3mm |
Fin Pitch: 3-25mm |
Tube Ends: Plain Ends / Beveled Ends |
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No Fin Area (Both Ends): As Customer’s Request and Drawing |
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Chemical Composition (ASTM A376 TP347H)
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Element |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Nb (Cb) |
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Range |
0.04~0.10 |
≤0.75 |
≤2.00 |
≤0.040 |
≤0.030 |
17.0~19.0 |
9.0~13.0 |
8×C min, ≤1.00 |
Mechanical Properties
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Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (HB max) |
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≥515 |
≥205 |
≥35 |
201 |
3. Key Applications in Refineries & Power
· Fluid Catalytic Cracking Units (FCCU): Waste heat boilers exposed to 650°C+ flue gas with sulfur compounds
· Hydroprocessing Heaters: Charge heaters in hydrotreaters/hydrocrackers resisting H₂S + naphthenic acid
· HRSGs (Heat Recovery Steam Generators): Evaporator/superheater sections requiring creep resistance
· Sulfur Recovery Units (SRU): Tail gas incinerators combating sulfidation attack
· Reformer Furnaces: Convection sections with coking tendencies at 700°C+
4.Why Choose ASTM A376 TP347H Alloy Steel HFW Solid Finned Tube?
A:Company Competitiveness:
Yuhong Holding Group has more than 35 years experience for steel pipe and tube , fin tube , main application for Petrochemical , Oil refinary, Furnace, heating, boiler, heat exchanger, air cooler,.., till now YUHONG brand products already exported more than 85 countries, which like UK, ITALY, SPAIN , USA, MEXICO , COLOMBIA , BRAZIL, SAUDI ARANBIA , OMAN, QATAR, U.A.E, KOREA, ...., YUHONG brand already won good reputation in the market.
B:Product Competitiveness:
· 15-Year Lifespan: 3x longer than TP304H in 700°C flue gas (per EPRI field data).
· Zero Carbide Precipitation: Nb stabilization eliminates post-weld heat treatment.
· Cost Efficiency: Carbon steel fins reduce cost by 35% vs. alloy fins.
· Customization: No-fin zones, fin pitch, and test coupons per client specs.
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