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:
| Bare Tube Diameter:16-219mm |
| Fin Height::5-30mm | Fin Thickness: 0.8-3mm | Fin Pitch: 3-25mm | Tube Ends: Plain Ends / Beveled Ends |
| No Fin Area (Both Ends): As Customer’s Request and Drawing |
Chemical Composition (ASTM A376 TP347H)
| Element | C | Si | Mn | P | S | Cr | Ni | Nb (Cb) |
| 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
| Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB max) |
| ≥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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ASTM A376 TP347H Alloy Steel HFW Solid Finned Tube For Heat Exchangers Images
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